Mercedes SL320 R129 - Part 2

Mercedes SL320 R129 - Part 2

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Yogioes

Original Poster:

234 posts

96 months

Thursday 14th May 2020
quotequote all
jke11y
It looks like it was a good job that was done in 2014. I had to look very closely to see signs of the work and it has a lovely finish to it.
I think they are probably correct about the bumper. I will attempt to tidy it up and keep a look out for a replacement although the second hand ones are pretty pricey.

r129sl
Obviously, I have followed your R129 story and it probably contributed to my wish to buy one.
Knowing that you had previously attempted to repair the existing back panel before getting the replacement section welded in has not filled me with confidence that I can sort mine.
I am disappointed, as I imagine you are, to hear that the replacement section has not cured it. It looked like a good solution and done well.

As an aside, I found your instructions for removing the door sill trims on the MB Owners site as posted in 2011.
If I had followed it properly I wouldn't have broken one of the plastic lugs!
These cars have quite a lot involved when taking anything apart so the first time is always a learning experience as it is not always obvious what sequence to use and when to push, pull or slide.

It's quite a contrast to the Series 3 Land Rover that I used to own where they very few items of trim were at most held on with a few visible self tappers. Admittedly, it was the other end of the comfort and refinement scale.


Also, I like how easy it is to get nearly all the small clips and fixings from the MB dealer by post. I'm using MB of Edinburgh and so far they have been very helpful.

r129sl

9,518 posts

203 months

Thursday 14th May 2020
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The repair around my number plate has held up, it's just the rear wheel arches that are starting to go and even then only on the inner edges. And one of the clips holding a Sacco panel to the door must have been badly replace because there is a little blob there. It doesn't help that I live 150 yards from the north sea coast: everything rusts here.

Yogioes

Original Poster:

234 posts

96 months

Tuesday 19th May 2020
quotequote all
I hate rust!

Horrible nasty stuff.
Well, I'm at the stage of wishing I hadn't started this job. It does need done and it's best to keep on top of the rust but I feel I have overstretched my abilities.
I was hoping to keep my attempts at repairs under the arches so that they would not be seen.
Unfortunately that has not been possible. It may end up physically better than it was but I doubt my skills will leave the outer edges of the arches looking better than they did before.
The work inside the arches has gone well. Small repair plate welded in and the missing rear arch liner studs have been replaced with rivet nuts. What a great invention! I should have got one of these years ago.
Not sure I would want to attach something too substantial but they seem perfect the arch liners.

So, onto lots of pictures

Front bumper removed and you can see the bit I hope to tidy up.
I have decided I need more space to do it so I will get the car mostly back together and out of the garage while I have a go at a tidy up.






While in the nearside arch I noticed that this pipe is split. It doesn't seem to affect the car and I don't know what it's for.



It connect to a plastic canister behind the front wing.



Unusually, particularly for a car like this, there was enough slack in the pipe to allow me to trim it and reattach it. Seemed sensible while I was there.




The hole ground out in prep for welding.



And with the plate with rivet nut welded in




And another one of the rivet nuts.
I had one trial before fitting these and am happy with how they went in.




Rust sanded down and treated with Hydrate 80




My plan was to try filler on the rear panel but now I'm just going to paint over the treated area.




Poor picture, but this is an area that would be better welded. You've seen my welding efforts so I am leaving it for now.
I have watched a lot of car resto TV shows and YouTube videos and they all make it look easy!




This is the front arch which had been grazed on the lip and was slightly dented. I had a go at filling that.
After two layers of filler and a some sanding I was quite pleased with my efforts. It felt very smooth .....
Then I sprayed the primer and could immediately see that it was not that good. It will no doubt look worse when it has shiny blue paint on it.
No pro painter needs to worry about me steeling his work.




The arches have been sprayed with primer and all the bits under the arch and the jacking points have been painted with Electrox.







I can no longer get newspapers from my mum for masking so have been using the plastic dust sheets and my daughters old Uni notes.


To lift my mood, the parts package from MB arrived with assorted clips, screws, fixings and bungs.
The two rubber bungs in the front end of the sills were both split roughly half way round. It seemed a bit odd and I did wonder if they were meant to be like that for some kind of ventilation but in the end I decided they were damaged and got new ones.
I like how easy it is to get these parts from the dealer.




I removed both side repeaters by pushing the clips in from the rear and was surprised when both the clear lenses popped off.
Some Araldite will hopefully keep them in place.
Ginger bulbs in these fittings, or should be. On was ginger and clear, the other was ginger and blue!
New ginger ones collected today ready for the refit.

Next job is to get the blue paint on.

I hate rust. Did I mention that?

I think my next car might be plastic or perhaps one of those very clean Japanese imports...

TBC

jke11y

3,181 posts

237 months

Friday 22nd May 2020
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Eagerly watching this to see the end result.

I went to see a 129 the other day but it needs what you’ve done; and I’m not sure I can kid myself on that I’d get round to it time wise.

Yogioes

Original Poster:

234 posts

96 months

Friday 22nd May 2020
quotequote all
Hi J,
I would suspect most of them need the same repairs if they have been used as intended.
The actual structure of the car is still in excellent condition it's just the front wings that really need sorted and perhaps the back edges of the rear arches. The rest is solid.

The wings could be repaired but I doubt I have the skills or the patience.

I'm interested to hear you are looking for another 129. Is this as well as the 124?
Best wishes with your search and hopefully you will let us know how it progresses.

Yogioes

Original Poster:

234 posts

96 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

203 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:

234 posts

96 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:

234 posts

96 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:

234 posts

96 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:

234 posts

96 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

4,179 posts

230 months

Monday 8th June 2020
quotequote all
Great work.

Stegel

1,953 posts

174 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:

234 posts

96 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:

234 posts

96 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:

234 posts

96 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

141 posts

71 months

Tuesday 15th September 2020
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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:

234 posts

96 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

141 posts

71 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:

234 posts

96 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.