Mercedes SL320 R129 - Part 2

Mercedes SL320 R129 - Part 2

Author
Discussion

Yogioes

Original Poster:

235 posts

98 months

Friday 22nd May 2020
quotequote all
I have had a go at patching one of the wheel arch liners with fibreglass. This is the section that goes in front of the wheel. It had some cracks in it although I have since found out that a lot of it is missing. It should have a section at 90deg going towards the front of the car.
I'm not sure if the fibreglass will work with this type of plastic but it's holding so far.




The front plate plinth had a split along the top line of where the plate sits so I tried the same repair approach with that.
It seems to be holding and I have sanded the front in prep for painting.




Flushed with the success with the rivet nut tool I decided to repair two of the front arch liner studs that were already missing.
My original plan was to ignore these as they were not there before and it had not been a problem.
However, I had the new toy so it seemed like a good idea to sort these while the liner was off.

I coated the holes and the rivet nuts with Dynax UB before insertion which will hopefully preserve the hole.

Under the arch -



And from above the inner wing. It's actually under a plastic cover.




First coat of Dynax UB on the under arch repairs




A little curiosity - when I removed the rear bumper I found there was a long tie wrap which appeared to go through these holes in the back panel and through two holes in the bumper. The holes had been roughly drilled, different sizes and were untreated.
As I was manhandling the bumper off I was not sure if the tie wraps were actually pulled tight or not.
I don't know why they were there but I'm thinking I might feed one through in case the previous fitter found it necessary to get the bumper aligned.
Curious?




While watching paint dry I had a go at cleaning up the front tow hook cover. It was a test of my patience and I'm not looking forward to doing the same on the entire front bumper. I wonder if my daughter is bored enough to think that helping with this would be fun..........


r129sl

9,518 posts

205 months

Friday 22nd May 2020
quotequote all
Gosh you're bold. And certainly more able than me.

The canister in the front wheel arch is a charcoal canister in the closed fuel-evaporation control system. I think fumes from the fuel tank vent into it and then into the intake manifold.


Yogioes

Original Poster:

235 posts

98 months

Saturday 23rd May 2020
quotequote all
Good to know, but I guess in that case mine was an open fuel evaporation system.
Closed now.

Second coat of Dynax UB applied followed by spraying Dynax S50 cavity wax into the box sections and through the rivet nuts that are into closed sections.

Now started on refitting things. This is a lot more enjoyable especially as I have lots of new fixings and clips and I had cleaned a lot of the parts as I removed them.

I decided that rather than just drill a hole through the arch liner plastic washers for a long bolt I would try to remove the plastic nut section.
It took a few attempts on the old plastics but eventually with a combination of drills and a router I was able to sort them out.

Rear arch liner refitted with stainless bolts. The other side has one stainless bolt and two original style fittings.




I know I have mentioned it before, but part of the pleasure of this car is the way it was built.
I'm used to seeing cars with plastic sill trims which look good but the sills are all rotted away behind them.
Not on these. The plastics are installed as protection. Yes, they get scratched and peppered with stone chips but they are plastic so no harm done. The sills are in great condition.
It seems obvious, but most manufacturers put screws through the metal with a little protection. These points soon form the start of rot.
On these cars the trims are all screwed into little plastic inserts which protect the actual holes in the metal.




The plastic windows have obviously reached the end of their life. This split appears to be growing every time a look at it even when the car is not being used.
I had arranged a local repairer to replace them but lockdown happened before they were ready for the car.




I was refitting the front wheel arch liner when I realised it had a fixing hole on the liner and nowhere to attach it.
I have already fitted two rivet nuts to this arch but had missed this one.
Still, another opportunity to use the new rivet nut set.

Yogioes

Original Poster:

235 posts

98 months

Monday 25th May 2020
quotequote all
The car now has enough parts back on it to allow me to get it out of the garage. Most of the plastics have still to be refitted.

This allows me to get the bumper into the garage to make a start on it.




After a lot of sanding and digging off the old repair, this is what I have.
The previous repair had a steel plate riveted to the back but most of it had rusted away.




I was originally just going to use a bumper repair kit but decided I wanted to reinforce that with some physical support.
I have added four aluminium strips (only three in this picture) that have been pop riveted on. Three of them have Araldite under them.




And only two in this picture




I then added the mesh bumper repair kit.
This was supposed to be applied to the front as well, but I had used up all the bonding material on the inside.




So, play has stopped for now.
It will be several days till the new kit gets here and I could do with a rest from this.
The sun is shining after a right miserable weekend so I'm of for a cycle.

If the weather holds I will refit the sill plastics and the door tread trims. I need the doors open wide for this and there is not really enough space in the garage for that. They are long doors!

Yogioes

Original Poster:

235 posts

98 months

Thursday 4th June 2020
quotequote all
If you have been following this you may recall that the side repeater lenses had fallen off when I removed them. I had repaired them with some Araldite. Sorted.

Or not.
They were quite difficult to refit, needing more force than seemed reasonable to get the "springy" grey clip into place.
Several days later, while looking at the loose side trim, I noticed that the repeater moved back and forward.
I picked it back out of the wing to find that the springy grey clip had broken off.
So, that was a waste of Araldite.
The other side had not broken off completely but was cracked and fell off when pushed.




Two new ones were ordered.
These weren't all that springy either and were also quite difficult to get locked into the slot. I think there may have been some filler on the panel from a previous repair making the panel a bit thicker and the lenses difficult to fit.




One thing with these cars is that everything is easier the second time you do it because you have learned the correct approach and sequence.
When I fitted the lower wing trim panel I fitted the clips to the wing and assumed that I would bump the panel onto them.
I now realise this was wrong. It worked for the rear clips but I could not get the front one to attach to the plastic panel.
On the drivers side I attached the slide in clips to the plastic panel first, slid the panel on and managed to bump on the front clip.
I could not do this on the passenger side.




The clip is attached to the wing with a self tapper which is not accessible with the wheel arch liner in place.
Also, when the lower sill trim was removed, there was an L shaped bracket attached which was not connected to anything. It should hook around a small tab on the side panel. Only accessible with the arch liner not fitted.
So the correct sequence should be sill plastic, lower wing trim, Arch liner.

So, arch liner back off again to get access to the screw for the side panel trim.
The screw at the bottom holds the L shaped fixing that hooks round the tab at the bottom of the wing trim panel.




This allowed me to fit the white plastic clip to the lower wing panel and then pull it in with the screw. Much better.




The painting of the bumper has progressed. Here are some of the parts with the blue paint applied. It made quite a mess in the garage.
This is them before more sanding, washing, rinsing, drying in preparation for the lacquer.
It was OK for the small parts but the bumper is a bit much for diy rattle can painting.






This is the bumper with the lacquer on it.




Hopefully I can get it reassembled and back on the car without doing too much damage to the paint.

Yogioes

Original Poster:

235 posts

98 months

Sunday 7th June 2020
quotequote all
Looking back, I see that I have a bit of a continuity error.
Apparently I didn't take any pictures during the multiple filling sanding filling sanding sessions on the bumper repair.
Words will have to do.
Firstly I used a Wayside Adhesives kit which included a mesh for the inside. It worked well but there was not enough in the kit for the size of repair I had.




Next I used this kit which also worked well although was very hard to squeeze out of the tubes.
It needs an adhesion promoter but the box only contains the two tubes. Fortunately I had some left over from the wayside kit.



Lots more sanding!

Then onto the finishing kit.
I liked this kit as it conatined everything with 8 small sachets of the filler and a pad of mixing sheets with markings on it for the amount of hardener.
The sachets are small but big enough as it hardens quickly and can be sanded after 30 minutes.



Lots more sanding and filling and sanding.
Eventually I had had enough! Onto prime, paint & lacquer.
Painting the registration plate plinth and the tow hook cover went well but getting the full bumper covered properly was a bit harder.
Not all of it is as shiny as it should be.

So, was it all worth it .......?

Hmmm
It kept me occupied during lockdown.
I need to leave it for two weeks before attempting to polish some of the masking edges but that won't alter the fact that the sprayed areas are a darker shade.
The car is physically tidier but does not look as good as I dreamt it would.
The front bumper does look a lot smarter without the splits, chips and scratches.
I decided not to tackle the driver side front wing which no doubt has a hole in the usual place. Ideally it would be replaced.

On the plus side, it is certainly very usable and is going very well.

The pictures ...........

Bit of lacquer run on the OSF wing




The front bumper










NSF arch. This arch had been scuffed at the lip. I filled and sanded it and thought I had done a really good job ....... until I put the paint on!
Also, I can't blame the camera for the colour match, that's what it looks like.




NSR arch. Some of the rust under the arch had worked up onto the panel so had to be treated and painted.




For the area above the rear plate, I only treated the rust and painted it. if you catch it in the right light you can see it.






Offside rear. Hopefully I can polish off the edge of the lacquer.





Hereward

4,224 posts

232 months

Monday 8th June 2020
quotequote all
Great work.

Stegel

1,960 posts

176 months

Monday 8th June 2020
quotequote all
Great work. My “what have I bought” investigations into my 95 SL resulted in all Sacco panels, arch liners etc. coming off, and while there’s less corrosion the number plate plinth and front bumper both require some work, so the Wayside Plastics kit reference is appreciated. I reckon your paintwork will polish up just fine - it’s one of those things that you know is there but nobody else will notice.

The plastic pieces that fit in between the bumper and front arches were far more mashed up on this car than yours were - one had clearly spent some time dragging along the macadam - but they’re still available at a reasonable cost from MB so I’m replacing them both.

Yogioes

Original Poster:

235 posts

98 months

Friday 12th June 2020
quotequote all
The next job I am contemplating is the grille.
It has not aged well and appears to be a common problem with these cars.
I thought it was only the tarnished appearance that was a problem but zooming into my photo shows a few little stone chips as well.
I have done a little searching for a solution.
A new one is not an option due to cost.
Best option I have seen so far is painting in the original colour although I would need to get that colour made up.




While the sill carpet trims were out when I was doing the paintwork I had a go at cleaning the dirt off the part next to the drivers foot.
Whose idea was it to put cream carpets in a car!
I started with Autoglym interior shampoo then tried some household carpet stain remover and then dish washing liquid and a lot of water.
The first two made little difference.
The dish washing liquid worked in with a nail brush and lots of water did remove lots of dirt but the actual marks on the carpet look much the same as they did when I started.

Hey ho, I tried.


Yogioes

Original Poster:

235 posts

98 months

Sunday 13th September 2020
quotequote all
Well, that didn't go entirely to plan!

Today's task was a bit of proactive maintenance albeit a little delayed.
Back in January 2019 I cleaned up the front anti roll bar and fitted new bushes. Smart red poly ones at that.

I noticed that the lower radiator hose had been rubbing slightly on the bar and decided that it would be better to change it before it became a problem.
I bought the new pipe and jubilee clips from Mercedes but it's a lot more fun buying parts than crawling under the car to fit them!

This is the old pipe and while it has worn a bit away, I don't think failure was imminent.




Today was the day for this job. It was fairly straight forward although it would have been a lot easier if I had taken the fan shroud off at the start of the job instead of near the end.
The fan shroud is very easy to remove. Two clips at the top and it lifts out.

Filled up the coolant and started the engine to circulate the coolant and check for leaks.

And there was a leak spraying out!

But not coolant, this was transmission fluid spraying out of the hard line that runs across the bottom of the radiator.

A picture of the fluid spraying would have been more dramatic but there was quite a lot spraying so I switched the car off.



In this picture you can see that the new coolant hose sits comfortably above the anti roll bar.



I must have moved the pipe a bit while wrestling the coolant hose off.
If I hadn't disturbed it, it may have lasted for a while longer but it is better to happen at home than while out driving.

So, finishing the coolant pipe and the oil change that was next on the list were abandoned.

I wrapped a rag around the pipe to contain the leak while putting it back in the garage. That was of little use.




The joy of running an older car ........ although it would be fair to say that if I was really proactive I would have noticed that the pipe was a bit crusty.

Hopefully I can get the pipe from Mercedes and no doubt I'll need some more fluid.


The car has been out and about quite regularly across summer and I keep hoping that it will appear on the "COOL CLASSIC CAR SPOTTERS POST!" someday. I suppose it would be cheating to spot my own car....

Here it is mid August in Glen Fruin




This was in Glen Orchy at the end of August


Yogioes

Original Poster:

235 posts

98 months

Monday 14th September 2020
quotequote all
Leaky pipe all sorted and only cost a few pennies.





Just kidding.
This is only a temporary patch to try and stop the oil dribbling out and also to allow me to move the car without it spraying out.

The P Clip bolt started to loosen but there was too much rust on the thread and as the nut is recessed into plastic it just started to spin so I ground the head of the bolt off.
I have no idea of the pressure in these lines but my dodgy patch cover did have me wondering if I could have bodged it with some hose and some proper hose clamps.

New pipe ordered. £133

I have 300ml of transmission fluid left over from the recent filter change which might be enough but I will probably get another litre while I am at the dealer.

DS129

150 posts

73 months

Tuesday 15th September 2020
quotequote all
Changed that pipe on my SL, finish on the new part was not very good so I gave it 2 coats of silver and 2 coats of clear lacquer plus a good coat of hmp grease.

Yogioes

Original Poster:

235 posts

98 months

Tuesday 15th September 2020
quotequote all
Hi, I admire your thoroughness.
Was it a straight forward change?
The connection at the top of the rad looks easy.
For the joint in your picture, does it need a new washer or any kind of sealant?

Thanks

DS129

150 posts

73 months

Wednesday 16th September 2020
quotequote all
Thanks, I like to do things properly.
Yep, straight forward, no need to remove bumper but it is a bit awkward laying underneath it with no access to a ramp.
There are 2 different fittings to the rad, MB got the wrong one for my car first time round.
I don't remember a washer in the other joint, it was about 8 years ago and the pipe only cost £45

Yogioes

Original Poster:

235 posts

98 months

Wednesday 16th September 2020
quotequote all
£45 !!!
I wish my savings went up like Mercedes parts prices. £133 for mine.

It was one of the easiest jobs I have done on this car. The old joints came apart easily and the refit was straight forward.
The only thing I had to do was tweak the pipe a little to ensure that it sat naturally in line with the P clip.
I added a little trans fluid, ran it up to temperature and checked the level. I probably added about 250ml all in.

The new pipe has a good finish on it so I fitted it as is. Hopefully good for the next twenty years especially as the car has only done 5k miles in the last two years. Currently just short of 117k.






I then did the engine oil change and there is a lot of oil to be changed!
The service indicator on the dash was beeping and telling me I was 13 days overdue.
One year five months and 3,600 miles since it was last changed.

DS129

150 posts

73 months

Thursday 17th September 2020
quotequote all
Well done , another job ticked off.
Yes, it is quite straight forward and I would suggest all 129 owners check this pipe as even the last are now 20 years old and a failure will leave it stranded.

Yogioes

Original Poster:

235 posts

98 months

Thursday 10th December 2020
quotequote all
With all that has been going on, or not going on, the car has not had a great deal of use this last year.
It was in for it's MoT in November and that recorded only about 1,700 miles use since the last one.

However, life's too short and all that so this is no garage queen. It has been used less but has still been used regularly.







I have found that I can only go for so long with the roof down and the temperature is a 1 or 2 degrees C.


The splits in the rear windows grow a little every time the roof is lowered.
I nearly had it booked into the local trimmers for new windows back in March ...... Covid Lockdown.

I called today but they still have too much work on the go. Hopefully they will get me fitted in before too long.



I may fit the hardtop to remind myself what it is like and to see if it is surviving storage under it's cover in the corner of the garage.

As always, I am considering changing it for something else.
I think I like the idea of something more mechanically simple.
I like old Land Rovers like a Series 3 but realistically I doubt I would use it that much. They are not great for a long run.
I like the idea of a TVR Chimaera.
The only car show that I could get to this year was at Kames Circuit. I found myself looking at a Jaguar E Type and thinking ...... Perhaps.
A Series 2, 4.2 2+2 Coupe sounds appealing

It's easy to forget the plus sides of the car I have. It's quite subtle and quiet (unlike the TVR), it's very easy and relaxing to drive, it's easy, if sometimes a bit expensive, to get parts for, it has good safety features with ABS, Traction control and Air Bags.

Well, it's only an idea as this has not been a good year for going to look at cars generally.
I might go and try some in the new year.

Yogioes

Original Poster:

235 posts

98 months

Monday 1st February 2021
quotequote all
On a second attempt, I put the hardtop back on the car.
It turns out that one daughter is not enough, it needed both of them.
This has had me looking at the options for a hoist to store it above the car and make it easier to fit and remove.
It would also free up some valuable floor space in the garage. A general tidy up and removal of some excess stuff would also help!



It is quite heavy and awkward to lift on but it is quite pleasant to drive with it in place with better visibility over your shoulder than the soft top. The better visibility is also noticeable as my soft top plastic windows are opaque.

Winter use is not good for keeping it clean though.




While watching assorted YouTube videos I came across one for fitting the centre console lid gas strut.
Well, I didn't even know there was supposed to be one! Mine obviously had failed.
I opted for the cheaper you.s branded replacement from Germany. I should probably have paid the little extra fro the Stabilus version as per the original but as I had managed fine with even knowing it was there, that seemed extravagant.
Apart from having to file a bit off one of the end lugs, it fitted fine and now the lid pops up when the button is pressed.
The mechanisms used in the strut and the hinges are another example of the extravagance of build in these cars.




When sitting still after a run with the engine still running I've started to notice a smell of burnt oil inside the car. Strangely, not so noticeable outside the car.
On first inspection it looks like there are some small leaks, or more like weeps, from the cam cover gaskets and the small crankase vent covers that are on top of them.
I'll have a closer look to see if some of the associated hoses at the back also need replaced before ordering the necessary parts.


Changing the gas strut for the centre console had me thinking about the one for the boot lid. It has bumped me on the back of the head a few times. It's fine if I push the boot lid fully up as it will stay there indefinitely. I leave the boot open while the car is in the garage as the battery charger is attached.
I just assumed it was meant to be like this but perhaps they are due for replacement.

And I gave it a wash so it's all clean again for now.

Edited by Yogioes on Monday 1st February 20:32

Yogioes

Original Poster:

235 posts

98 months

Tuesday 9th March 2021
quotequote all
Well, I found one slight disadvantage with replacing the centre arm rest gas strut.
The upward pressure of the strut means that the lid is pushed up against the release button.
Every time I lift my elbow off the lid there is a small click.
Minor I know, but mildly irritating.

Having read r129sl's thread about replacing the door speaker covers I decided that I would have a go at that.
I also wanted to replace the larger speakers at the same time.
I had previously found that the passenger speaker had no cone in it and I had used an old speaker that I had in the garage. That speaker was certainly older than the car but it worked.

I spent a bit of time reading threads about speakers and ohms but hadn't really found a solution.
The original speakers were 1,2 ohm which seem to be hard to come by. Most of the readily available speakers are 4 ohm.
I eventually bought a pair of Audison 2 ohm speakers although I was a bit surprised that they arrived wrapped in shaped brown cardboard, not in a fancy box.
Anyway, I fitted them.
I suppose they are OK but it does feel as if it is lacking on the bass.




So, the door speaker covers.
I didn't think mine looked too bad in terms of dirt and scuffs. I was more irritated by the poor fitting and loose edges of the covers.

However, when I look at these pictures they seem worse than I thought.








I got the new material from AS Essential Trim and picked Magnolia on the basis that my car has the very light coloured Helios trim.
Well, Magnolia is even lighter.
I went ahead anyway.
The material is a very good match in terms of its construction compared to what I took off although obviously I have no idea if that was original.

This is one of the small panels as removed.

|https://thumbsnap.com/jL7vZwxU[/url]


It's a bit nerve wracking trying to get the cloth stuck on allthe way round without getting glue all over the front of it.
I used some spray contact on the front of the hard panels to keep the cloth in place but this left small lumps that are visible.
Bostik brush on glue was used on the back to actually hold the cloth on.
The smaller panel is held onto the door card by melting over the ends of the plastic location posts and two screws.
These had obviously been off before as most were already broken and there was some double sided sticky foam tape in a few places.
I used B&Q's version of Araldite to fix them back on.
I also discovered that the location posts for the drivers seat adjustment switch panel were broken. Some araldite secured that.

I tightened all the screws and the three nuts that are accessible on the back of the door cards.
The bottom of the door box should be attached by screws with large washer. These are only half holes if you know what I mean.
All four of mine had come adrift.
I also re-attached four of the plastic backings for the trim clips.
The combined effort of that has taken away some of the annoying little rattles and vibrations that could occasionally be heard.

So, after all that, does it look any better?

Well, it is cleaner but as for the colour ......

It seems like a poor design to me. If I only have the door open to the first click I have to be careful not to catch my foot on the cloth panel. Plastic or carpet would be easier to clean.


The finished article





[url]

Clifford Chambers

27,162 posts

185 months

Tuesday 9th March 2021
quotequote all
Good write up.

Winters have taken thier toll on mine. I'm going to give it a service and spring clean then run it through the summer. It's no longer fitting into my lifestyle so next winter I'll either.

A) Sell it.
B) Take it off the road and fix it up.
C) A+B
B) Keep it as a summer only car.