1991 Mercedes W124 250D Manual

1991 Mercedes W124 250D Manual

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SebringMan

Original Poster:

1,773 posts

187 months

Monday 27th April 2020
quotequote all
Well, this Mercedes has been a strange one, and almost became a keeper! Barely 2 year ago, it was a car that was forlorn and stood up on someone driveway due to them being unable to get it running. From that, I went on a bit of a mission to titivate this car. While it worked, a couple of other issues reared their heads, but despite that, I really fell head over heels for this car. It was easy to see why as well.

-It looked great when tidied up. Sure, a 320TE looks a little better, but the newer cars still have an elegance around them, when adhering to the Sacco virtues.
-It was a comfortable old boat! Sure, you did rush around in it, because you could, but you didn't need to.
-It was swift! With the 220BHP M104 lump coupled to the 5 speed 'box, it really shifted well!
-It just had a good vibe about it! With the combination of Cream leather and the Azurite Blue paintwork, it didn't say taxi cab, it was almost a kind of lifestyle vehicle!

However, reality had to set in. Driving a 24 year old car that's been stood up for 2 years will take commitment as a daily; There was almost always a to-do list on this car. 22MPG everyday when doing 300 miles a week at times can soon become painful, when it takes almost £70 to fill up for those miles! Ouch!

I'd have loved to have kept it, but with the arrival of the new toy, it was either this or the M3 that had to go. That was a hard choice for me, given that the M3 would release more funds. But then the M3 is great in another way, and has a number of the Merc's things in a weird way. I also wouldn't have done quite a few of the trips in this Merc that I'd do again in the M3 either. It's strange, having cars known for being good, but also meeting or surpassing your expectations there. Normally mine have been crushed in the past, but not with those two cars.

It's funny, a car that you bought on a whim from a mate can end up working it's way to your heart, and man this one did! It's however, gone to a man who knows W124s well, and will do right by the car. You can't keep them all, and there is more to try. But it's funny how I was willing to settle on that car.

Was I right to get rid of the W124 over the M3? Should I have bought the next car, knowing it would compromise my car situation? Would I come to enjoy the new car as much? Time will tell. In many ways they are similar.

Farewell old friend! You served me better than I expected, and I couldn't have asked for more smile

The new car? That will arrive in the next post wink.

SebringMan

Original Poster:

1,773 posts

187 months

Monday 27th April 2020
quotequote all
So it seems a few people may know that I had this motor. So, naturally, I figured I'd say more here. I bought this car over a year ago, and these posts are dated from back then. But here it is for you folks smile.

It seemed my car collection was so cosy! So right! What did it compile of?

-A Citroen 2CV6 Special
-Mercedes S124 E320 Special 5 speed
-The BMW E46 M3.

So, did that satisfy me? Sort of. If I could pick two of those to keep, it would be the Germans. The Citroen is lovely, but a little testing in daily traffic, which doesn't happen at times. However, at the right time, I really, really liked it!

Buying the Citroen made me realise a few things however. Not all cars are the same. OK, I knew that. But also, even the 'cheapest' cars can soon become expensive to run. I'm surprised at the parts prices of some of the parts of mine. Yes, I could have gone cheaper, but I've hit that stage in life where it is nice where things work, and you don't keep going wrong and then around in circles, circles and yet more circles. Does this sound familiar to us? It certainly does to me!

Clearly, I should have sold two of those and kept one. Except, there comes in the issue.

-The S124 is the imperfect daily, yet perfect! Yes it drinks like George Best doing 24MPG around town, but it's sooooo nice!
-The M3 as my thread makes clear is far from a cheap car to own. But; it's a lovely drive! I drove some moderns as a temptation to replace it, and I couldn't bond with them. Yes, for the right or wrong reasons, the moneypit of the E46 M3 is here to stay. I've had some bitter times with it, but some of the best times too! You cannot put a price on that really smile.

Anyway, I'm waffling. Where does the W108 come in?

A while ago, a mate of mine Rich bought a W114 250S. I jokingly said I'd buy the 280SE the chap had for sale. It seems I couldn't; it sold within the week. Was I bitter? Yes, very!







In short, I really fancied it, but of course, it couldn't be mine!

Let's go forward 2 weeks.

The same seller had a 280SE 4.5 coming in, apparently better than the other car. So, how did this look? Pretty similar if I am being honest!













So, it looked good! Damn, I was almost over buying a W108! Yes, I remember seeing the odd one in the '90s, and loving them at the various car shows I've since been to! Damn, I got over getting one of these too! I guess I wouldn't get over so soon!

There was only one thing for it. See the car. Seeing it, it was rust free! Sure, the horn didn't work, and I couldn't figure out half of the controls. But the deal was done! I agreed to buy it, and despite my collection of cars, made movements to ensure I could fit it in the stable! Yes, the 2CV would go to a new home, but I can move onto bigger, and better things right?

Well, we shall see.


SebringMan

Original Poster:

1,773 posts

187 months

Wednesday 29th April 2020
quotequote all
It was a bit of a struggle, and my back going right after I paid the seller really threw a spanner in the works for a delivery time! After all, I couldn't really move things about at the unit with me being a cripple!

Fast forward on, and my local garage came to the rescue. He agreed for the car to be delivered to him and that he would also MOT it.

MOT it I hear you ask? It doesn't need one of those? Indeed it doesn't, but that does come with a few issues despite some success of people here doing it.

-Restorer friends of mine have noticed that almost every 40+ year old car imported has been inspected quite recently, with them generally being registered off the V112 MOT Exemption form.
-Chatting to the DVLA yesterday, a gent on the phone told me that cars arriving with a V112 are more likely to get inspected than those without one, despite the evidence put into the envelope when it's sent over. After all, an individual has less to lose over mis-supplying information over an MOT tester, which is their liveliehood.
-While I know my way around a car, it's nice to have a second look over.

So, how would the old girl fare on the test? Honestly, not terribly! It could always be better mind you!



So, it failed on:
-No numberplates ; No, I don't really get that either, and my tester is normally pretty fair. I'm not sure if he is familiar with the process of registering cars...
-[s]Headlamp aim is to the right; wrong lights[/s]
-Horn doesn't work
-Battery is loose in the tray
-Wipers are shot as is the washer pump
-[s]A marker light wasn't working[/s]
-One track rod end is terrible
-Two exhaust mounts have broken off.

A few of those failures I expected as you know, but some were a little embarresing. The battery is terribly loose in the engine bay! I, at the time didn't realise how to operate the washer jets, and my tester and I were listening out for a pump. The track rod end I didn't notice on the test drive at the farm when I viewed the car, but on the ramp, it was clear it was in a terrible way. There is a good few mm of movement in each direction! Strange, as the steering 'box isn't that loose for a car of this age!

To top things off, the engine started sounding a little rattly at the station when it was intially dropepd off and the engine was at 225 degrees Fahrenheit. The oil pressure was 30PSi idling hot, and my heart just sank at that point. what had I bought? But once cold, it was quiet! Except the battery was now flatter than a flat thing! Thankfully, my Noco Genius Boost (my garage has also since bought one) saved the day. firing it up seemingly as if it wasn't struggling.



The garage has agreed to pass the car once I've fixed the above. Then, it was a case of delivering the car to the unit, with me agreeing a time of 5:30 with my garage, saying the 2CV was being picked up that day as well.. That day was not a pleasant day by any means! In short:

-The 2CV went away that day. The buyer however hadn't told the towing company that the car would have spares included as well. What should have been a 15 minute transaction soon became almost an hour, as I was rumaging around to repack the spares into the car.
-My old man's recently bought an Audi A3 8P, of the 2.0 PD TDI 140 format with a DSG 'box and in SE trim. I offered to service it. All was going well until I did the fuel filter ; it was the wrong one. To make matters worse, the seal got nicked on the old one, meaning the filter had a dribble. Pretty crap really as it was now 4pm, and the nearest motor factors were 10 miles away, in Coventry. Not what you want. I would have to take the Audi, with half of the diesel going into a leakproof bag I enclosed the leaking fuel filter in. At ECP, they still couldn't narrow it down, so I did it off images only. I then went back to the unit, somehow not spilling any diesel out of the leaking filter, threw the filter in, and proceeded to clean up the diesel.

The car looked a mess initially, but the unit looked more like a disaster zone and I stank of diesel and was minging. The time I hear you ask? 6pm. Great, I'm late! I ended up getting to the garage at 6:30pm, with the owner being fairly calm about it. The 280SE was already on the ramp, so there was nothing for it, but to take the car to the unit!

At least the traffic was calmer at 6:30, much calmer than if we set out at 5:30.

Once we got to the unit, it was great to see the car on some of my turf smile:



With this done, I ended up parking it into the unit, awaiting some parts to arrive. Sure, I looked like a greasy coalminer or a homeless person at this point, but at least things had got done smile.

The next day, I'd set to work with knocking out the failure items.

SebringMan

Original Poster:

1,773 posts

187 months

Wednesday 29th April 2020
quotequote all
Cheers both! There is more to come on this car!

ian316 said:
That is beautiful if I could have more than one car at a time an older Merc would be it. Watch a program called love on netflixs called Love she has a w108 the wonky spotlights do my head in but it's still stunning
I'll have to watch that smile.

When I first drove this, it didn't dissapoint smile. It's a very different beast to the E320 that came before it!

SebringMan

Original Poster:

1,773 posts

187 months

Wednesday 29th April 2020
quotequote all
So, I made a start on working on it. The first thing to do was to have this car keep a charge. My faithful BMW 990Ah battery actually had a use for a change! Normally, it's too big for any of the cars! The 550Ah battery that was old and most likely shot from the US came out. It seems according to my tester that the CTEK really did its thing on that BMW battery. It came back with 995Ah on the tester, a pretty decent result!

Upon throwing it in, I fired it up. Immediately the engine fired into life. No coughing, spluttering or almost catching. Just a clean fire up. It's never turned over this fast before! Whilst I was here, I checked the alternator output. All was fine there too! Excellent! Believe it not, this battery came from a dealer friend of mine, where BMW threw batteries away which they suspected of being iffy. This one was fine by the looks of it.

However, the battery terminals on the battery were mangled due to the battery being used as a jumper battery. Not a good thing really. But after some caressing with some sandpaper, the car terminals slipped on fine smile.







With that in mind, I figured I'd show it off against my other Merc. 23 years separate these cars, and it's fair to say that it really shows! Now, the S124 against a new Merc would be an interesting comparison, albeit I've sort of done that wink.











I even thought I'd register it. Naturally I couldn't, but one can pretend eh? I'm sure Raul would approve!







Ah, let's have a few more shots eh?





I even took it for a spin in the yard. After all, it's private land smile. The rattle once hot would stop and not come back as soon as it was driven! Strange eh! You can't make this stuff up!

Either way, I had to crack on with the car. Enter Stage Left:



What was interesting is that the Mann filter seemed to have more pleats and finer holes on the very inside of the filter? Will this make a difference? We will see.





Out came the surprisingly thin oil from the engine, and also the cheapo filter. However, the filter housing was very clean inside ; a nice sign to be fair.





With this done, it was time to fire it up! Thankfully the oil pressure doesn't now drop below 45 when hot, and the engine is very quiet now smile. A result indeed!

Naturally, I still have tons to do, but that can wait until next time smile.

SebringMan

Original Poster:

1,773 posts

187 months

Thursday 30th April 2020
quotequote all
ian316 said:
After watching another episode of that netflix prog it could be w115 US headlights always throw me, I like that you're straight on with the oil change and stuff a lot of people would just have looked at the dip stick and thought that looks clean
You may be in for more of a treat as this tale goes on in that case wink. But yes. I needed to know what I was dealing with smile.

I know what you folks are thinking! I should be doing the fun stuff! But let's be honest, what point is there if I can't even drive the car? But slowly and surely I'll get there!

The good news is that most of the parts have now arrived! But I still had to diagnose a few things!

Firstly the horn. The switch is working, but there is nothing happening at the horn. I have a spare brand new horn, so that will be getting fitted shortly smile.

Then there is the sidelight. I almost forgot how to deal with old lightbulbs! I've not really had to deal with them for a while. The Carina and the W124s both had internally changeable bulbs for the best part despite the headlights being more traditional on the Carina.

The marker light required investigation. After taking the bulb out, removing it, and cleaning it up, I put it back in again. Halleluyah! I now had a working set of bulbs all round!



Sure, it now looked good, as a Stateside Merc should, but having candles for headlights up front was never going to be of any help!. It is said that the Windproof Zippos give out more light than 4 of them put together! But what the Americans want, the Americans get. Isn't that what Trump is saying these days?

For those of you wondering why this Merc came equipped sealed beams for a '72 car, it's a pretty simple reason. No, it wasn't what Mercedes had lying around on the shop floor. It was a regulation set by the US. The idea was that if you blew a headlight, you could go to any drug/convenience store, and pick up a light that would go into any US car. Yup, back then, the US only had one size of light to fit every US homologated car. Soon, that became 3 sizes of lights towards the 80s.

Here is some info for those who fancy some bedtime reading on the subject, shamelessly stolen from a mate of mine smile.

But how would I solve this issue! After all, the beam pattern was wrong for UK roads anyway! Get some Halogens of course! Sure, they're not LEDs or HIDs but at least they would look right. However, what would I choose? I had some experience of Halogens previously too. In a condensed format:

-MGB Carellos: Not bad at all. Fairly standard light
-Triumph Stag Autopals : Honestly? Pretty crap. I'll be honest, they weren't much of an improvement over the sealed beams I removed! It seems the new owner thought so too, which is why he threw them in the bin
-Dolly Sprint Autopals: See above for the Stag
-Triumph Spitfire on Wiper QuadOptics and Osram Nightbreakers : VERY Good! I was surprised by the output! They were that good! I always wanted a little more light at nighttime but they were a big improvement from above.
-'76 Carina on Autopal lights and GE Bulbs: They were very good! The lights themselves seemed like a much better quality than the ones I got for the Stag (and the ones in the Sprint) The reflectors were actually reflective! It wasn't a bad car to drive at nighttime that one smile

So, I've had a mixed bag. What would I do on the Merc? Go cheap like I did on the Stag or go middle of the road, but risk an iffy batch of headlamps? Nope. I lost the plot and decided to splash the cash:



Yup, I went with the Cibies! One light cost more than a pair of Autopals, but I've not heard a bad word about them ; it's what the owner of my Stag fitted into that car with good results too.

Firslty, I wanted to do a comparison however. So I tested the sealed beams on the dip setting, but with a CTEK charger on in the supply mode. That way, I could keep the test fair smile. In an enclosed unit, that would also make it more fair smile.



I think you'll agree. They're not too bad, but they could be better. Soon I cracked on with stripping down the light assemblies:



Compared to the new lights, there is not alot of difference visually. Yes, I also decided to throw in the Osram Nightbreakers I had originally had destined for the W124 ; but that car has surprisingly good headlights compared to my previous W124s. Maybe that's on brighter bulbs already.



All I had to do was put the boot on as a finishing touch:







Sure, the Cibies don't look much different to the sealed beams, but at least the car will actually illuminate the road without blinding oncoming traffic! Note how one of the Sealed beams is milking at the top of the unit. It seems that was due to burn out anyway, so maybe this upgrade was done at the right time. OK, I'm making excuses for splashing the car. I know! With the lights ready, I clearned up the Chrome surrounds, copper greased up the fixings in Classic Oils high copper quantity Copper grease (great stuff that is, especially being free!), and threw the entire lot back together smile:




I know, it doesn't look massively different!

With that in mind, it was time to perform the acid test! Was there actually going to be a difference?



YES! The photo doesn't really show it, but there is a stark difference in brightness and focus! Damn me leaving my camera card at home! If you think that is good, wait until you see the full beam shot! Oh, wait, I have one coming up!



Yup, that is quite a difference. The lower yellower light is still an H1 sealed beam. It's fair to say that the newer Cibie has trounced it, well and truly! Fancy another shot? Yeah, why not?




Yes, that really is quite a difference!

So, that's enough about the light geekery! At least I've sorted the lights out and I'll be able to see where I am going at night. But i still have a few things to fix One of which is the washer pump. For a Mercedes, it's quite an antiquated setup, with electrics being present, but now how you expect them to be!




The idea is that you push the bellow, and a switch will then turn on the wipers as you squirt the washers. See what I mean now? The issue with mine is it doesn't squire the washers at all. The bellow has split and I am missing a one way valve. That' sounds fine, until you realise that a rebuilt washer pump assembly is £400 and the tank assembly is the same again! Ouch! Who said Merc ownership was cheap! Naturally, this leaves me in a dilemna. Do I replace the pump bellow with a switch to activate a pump, but put that into a tight engine bay, and modify the wiring etc. or do I source the broken bits for around £120?

Choices choices!

SebringMan

Original Poster:

1,773 posts

187 months

Friday 1st May 2020
quotequote all
So, I left the car at the washer pump scenario. I decided to order the bits stupidly! It's a nice setup to have, but it's not arrived yet! So while, I have a backup solution in place, I'll say more closer to the time. After all, it had a fair few things to do before it would see the road!

Tyres are one area I am sketchy about these days. I did some pretty silly things in the past but I guess, as you get older, you get more sensible. Sure, the car came with Michelins, that were nearly fully treaded, but they were not free of issues.

-They were flat spotted badly
-They were cracking horrendously.


I know many RRers would have driven on them, but I couldn't do. When others are saying your tyres are bad, you soon wonder if they have a point! So, with a bit of searching I hit a few snags, which brought back some memories from My old Stag, with this being a 185R14 tyre from the factory or a 7.35 x 14 Crossply, which mine looks to have come supplied with going from the spare.

-Get a budget or van tyre fitted? Sure, it would be cheap, but it wouldn't be right for me, and I've previously got rid of cars becuase the tyres were crap and I didn't realise their impact back then,and I've transformed a few cars with new tyres.
-Go to @dougal007 and get a set of Michelins. The right way to go, but it pains me getting tyres for the M3, let alone two cars having cars having cars with a near £1k tyre bill! That and I wasn't sure if the wheels looked right. Sure, they look good, but with the now 205/70R14s on, they are getting a little old!
-Change the wheels. Tricky, but doable.
-Go for a smaller tyre, which makes choices easier and cheaper for better products. I'll be honest, the tyres look lost on this anyway, so that was out of the question.

What would I do? Enter Stage Left:



Yup, I got myself a set of Mexican Hats! But I needed some tyres, What would I go with? A set of Falken ZE914s in a 205/65R15 size. Out of the mid-range stuff, I've always found Falken to be a decent step up from Kumho. I question if the grip is quite as good as the big boys but it certainly is close going by the FK453. However, tyre life is appalling. But on a car that will barely do 15MPG, I doubt tyre life will be a massive issue either wink.

Despite looking like an easy combi, it wasn't quite so straightforward to fit them on.





They wouldn't pop onto the bead, despite moving the tyre about on the rim. My tyre fitter wondered if it was down to it being a 7J rim and a 205 section tyre, but I've had 195s on those in the past as an OE fitment. In the end, a device called a Cheetah inflator was deployed and the bead was seated in no time smile. It's these things I do like about Ross at BT Tyres in Rugby. If you have tyre needs or issues with balancing/tracking, he is your man.

After they were fitted, I couldn't stop admiring them! But it was pointless! They weren't on a car!






That said, I still had plenty to do on the car. It had brakes were it seemed the handbrake was always on, and I still had no washer pump or the track rod end issue resolved. They would come to be a little trickier than I thought.

SebringMan

Original Poster:

1,773 posts

187 months

Friday 1st May 2020
quotequote all
300sl-24 said:
Can I ask where you bought the polished rim Mexican Hats in 15" from please?
They were not brand new. They were however reasonably priced compared to many people out there. I bought them from a Ukranian chap who sells quite a few wheels in Hillingdon. He had a choice of me either buying all silver wheels or the polished lip items that you see there.

These are not genuine Mexican hats. They are ATS versions which IMO look a little better. They have the right amount of dish, which many other copies don't manage. Being German made, they are also TUV approved with a KBA no. on them so they are certified.

They were quite a bit lighter than the factory rims I took off.

SebringMan

Original Poster:

1,773 posts

187 months

Friday 1st May 2020
quotequote all
So, I had some fancy looking wheels! But that wasn't the end of it.

The first was to get a working washer pump. While I ordered the parts, they would take some time to arrive! So in the meantime I threw in a switch under the pedal, in addition to an electric pump. This would work for as long as I needed it to.

Secondly, I had to change the severely knackered track rod end. It had a mile of play in it pretty much! Working in logistics, I ordered the right part days before hand. However, it was the wrong thread; I need a right hand thread to work with mine. Balls! However, it was no great loss as the boot was cracked anyway on the correct balljoint on the same rod. So that was changed. While ECP couldn't provide with a TRE, a local motor factor would save the day smile.



I'd have taken pictures, but I did have a few mates around to assist, so I didn't really want to seem anti-social. And they'd help me remove the very stuck caliper on the car!. Even with alot of hammering, the offside caliper really didn't want to come off. Eventually, it did thankfully.

As said before, the calipers from the SL shop and other sources are £250 each! Bigg Red wanted £130 to refurb both calipers, which didn't seem like a bad deal. However, I decided to get the piston and seal kit prior to calling Bigg Red. A mistake, but OTOH, it would cost me £60 per axle, and I've fancied rebuilding calipers for some time. It's fair to say that the pistons came out with a fight! However, they cleaned up well, and the bores weren't too bad either.







During the cleaning process. Then it was time to look at the old pistons.





They're not great, but not that bad at all. The car clearly had been sitting for quite some time!

But why use old pistons when you can go new?





Before I knew it, the caliper was assembled and ready:



After having a friend around to help me bleed the system, I now had a car with a good pedal and a permanent handbrake removed. I also had a link pipe to one caliper remade for me due to us breaking it, but it was fixed!





All I had to do now was to fit the caliper to the car and bend the pipe to suit.

The next thing? Get the horn working. After finding a horn from an MG Midget, that was working once more. Sure, the car had a bit of BL on it now, but at least it would get an MOT.

Finally? The exhaust rubbers. With that done, it was time to get the wheels on. Except I hit a problem.

The nuts I bought (the ones on the right) wouldn't fit. They were catching the rear drums badly. I'd have to wind them out around 6-7 turns for them to clear the drum. But would the new bolts in the middle fit and do the job?









SebringMan

Original Poster:

1,773 posts

187 months

Sunday 3rd May 2020
quotequote all
helix402 said:
Loving the old bus. Have you thought of doing a new thread for the latest Merc?
Debating it. I didn't update it on here as last year as it was a very busy year for me, with my sister getting married, and with me also coming to terms with a job a little different to what I was used to, with a manager who himself was in a similar position. I'll touch on the wedding part later on wink.

I still have quite a few updates for this however wink.

It's a shame you can't change titles as I would change it otherwise smile.

Meh! You win! I'm going to put this onto a new thread. The first few posts will be a repeat as they'll obviously be here. But the rest will be new after a while and there was stuff which happened after this smile.

SebringMan

Original Poster:

1,773 posts

187 months

Sunday 3rd May 2020
quotequote all
ian316 said:
Rebuilding calipers yourself is a very satisfying job, loving the wheels
It really is! I wasn't going to do it on the M3, but being a sliding caliper, the job should be easier smile.

r129sl said:
The wheels are great. I'm surprised you had bother putting a 205 tyre on a 7J rim: the gen2 w126 takes 205/65 VR 15 tyres on 15 x 7J rims.
We do wonder if it was down to storage issues with the tyre. However, they have been fine on the car smile. The W126 having that size was a partial driver for me having it in my car:

bristolracer said:
I remember watching Ryan O Neal in the film The Driver giving one of those a test drive.

Great car
I saw that after buying the car!

SebringMan

Original Poster:

1,773 posts

187 months

Sunday 3rd May 2020
quotequote all
The W108 now has its own dedicated thread.

Enjoy folks.