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  #1  
Old 06-09-2019, 03:27 PM
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HELP! Stripped Vavle cover bolts!

I have stripped the valve cover bolts on my '85 300D, the front 2 to be precise, and I cant find them anywhere.

I'm not sure if I'm searching for the wrong keywords or if they're just impossible to find. Any ideas? Please help, I'm without a ride until I find them.
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  #2  
Old 06-09-2019, 03:34 PM
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Which ones? On top of the valve cover or the nuts and studs that hold the cover in place?

If it is the ones on top, the cover threads are probably stripped, not the bolt. Those bolts are standard hardware at a hardware store as are the nuts holding the cover down. Try to be more precise as to the problem or post a picture if you can.

Good luck!!!
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Old 06-09-2019, 03:40 PM
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Are the threads in such bad shape that they can not be repaired? Maybe going one size down with the corresponding nut would be an option.
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Old 06-09-2019, 03:43 PM
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Quote:
Originally Posted by Sugar Bear View Post
Which ones? On top of the valve cover or the nuts and studs that hold the cover in place?

If it is the ones on top, the cover threads are probably stripped, not the bolt. Those bolts are standard hardware at a hardware store as are the nuts holding the cover down. Try to be more precise as to the problem or post a picture if you can.

Good luck!!!
The nut and studs that hold cover in place.
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  #5  
Old 06-09-2019, 03:45 PM
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Originally Posted by tangofox007 View Post
Are the threads in such bad shape that they can not be repaired? Maybe going one size down with the corresponding nut would be an option.
They're beyond gone. I had to pull the cover off, vice grip the bolt and put pressure under the nut with a screwdriver while turning the nut to get it off.
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  #6  
Old 06-09-2019, 03:55 PM
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I found this thread, but it's not much help other than "get them from the dealer".

HELP- Broken valve cover bolt
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  #7  
Old 06-09-2019, 04:08 PM
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Originally Posted by jhtanglewood View Post
I had to pull the cover off, vice grip the bolt and put pressure under the nut with a screwdriver while turning the nut to get it off.
Does that mean that the studs unscrewed from the head?
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Old 06-09-2019, 04:10 PM
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Originally Posted by tangofox007 View Post
Does that mean that the studs unscrewed from the head?
Yep, the front 2 anyway.
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  #9  
Old 06-09-2019, 04:39 PM
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Unhappy

The threads on the head side are fine, so just the studs and nuts are what I need. I've been unable to find them anywhere, looks like I'll have to get a rental car and call a dealership tomorrow.
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Old 06-09-2019, 05:14 PM
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A couple of approaches if you can't get the proper stud:

If you can get the studs out without destroying the threads in the head, they can be
replaced by a bolt instead of a stud OR use a cut-off bolt as a stud. The latter will
require use of a thread-locking compound so the bolt does not unscrew when
removing the nuts in the future.

A proper stud has a coarser thread at one end so it does not unscrew.

Stripping those fasteners was probably a result of overtightening the nuts in an attempt to eliminate a valve cover oil leak. The specified torque for those nuts is very low, 10lb/ft or 14Nm. If you cranked down on them hard enough to strip you may have damaged your valve cover. It is an aluminum casting and can be warped by overtightening.
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Old 06-09-2019, 05:39 PM
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Honestly, I'd be comfortable trying a clicker strap around the engine. If there's not a spot between two intake runners that you can run the nylon strap, use a coathanger for the portion that comes close to the exhaust manifold.
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  #12  
Old 06-09-2019, 05:45 PM
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Quote:
Originally Posted by rocky raccoon View Post
A couple of approaches if you can't get the proper stud:

If you can get the studs out... ...overtightening.
Thanks Rocky, the threads on the head side are fine so I should be good there. I don't have any leaks (believe it or not), except for a pesky very slow ooze somewhere around the turbo.

I'm hesitant to replace the studs with bolts because finding the exact size & thread at a hardware store could be difficult - impossible.

One of the nuts was a little stripped when I removed the valve cover the first time (adjusting the valves and replacing the valve cover - see pic), buying new nuts is what caused the whole issue. I bought a few sizes M7 M8 1.0 1.25... I don't remember which one I used but they went on somewhat smooth and I didn't think there was a problem until I tried to take them off again to adjust the gasket. 1st one came off smooth as butter, 2nd was a little rough and the last two pulled the stud out.

I think I'm just going to order from the dealership unless I finally stumble upon them online.
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HELP! Stripped Vavle cover bolts!-20190603_175656926_ios.jpg  
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  #13  
Old 06-09-2019, 05:49 PM
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Quote:
Originally Posted by moon161 View Post
Honestly, I'd be comfortable trying a clicker strap around the engine. If there's not a spot between two intake runners that you can run the nylon strap, use a coathanger for the portion that comes close to the exhaust manifold.
Thanks, that's Plan D.
Plan B is double sided tape.
Plan C is Gorilla Glue.
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  #14  
Old 06-09-2019, 06:02 PM
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Quote:
Originally Posted by jhtanglewood View Post
Thanks, that's Plan D.
Plan B is double sided tape.
Plan C is Gorilla Glue.
Don't do plan B or C.
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  #15  
Old 06-09-2019, 07:02 PM
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Quote:
Originally Posted by Maximan1 View Post
Don't do plan B or C.
HAHA! but Plan D from Moon is OK?!?

I've tried:
Pelican
ebay
amazon
all of the auto parts chain stores
the Mercedes dealer sites
Kent
Autohauz
Car-parts
discount car parts
Rock Auto
*********
eeuroparts
ECS
and few more.
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