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  #1  
Old 09-26-2014, 10:46 AM
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Glow plug thread stripped in 606 and w210 models 1995-1999.

For all you DIYers who have diesels taking thread size 12mm x 1.250 glow plugs that need the glow plug hole repaired or restructured:
I discovered a kit from Time Sert, #4212, that works. It's normally a spark plug repair kit, but it works. It uses a double step die, and I used a 17mm insert. The insert has a flared edge so you must use a 9/16" drill bit to just cut an edge on the newly tapped hole and then use the tap once again to just smooth off the flared hole. Then, oil the insert, put it on the insert tool and screw in all the way. Also use in model W210.

Just remember to vacuum out all the metal chips from tapping and drilling. Use grease on the tap to catch most of the metal chips.

There is no other way of repairing these threads short of pulling the head and welding the hole then re threading it.

Prior to 1995 all MB diesels used a 10mm sized glowplug. There are repair kits for them but not for 12mm.


Last edited by ohiomike; 09-26-2014 at 03:23 PM. Reason: Update
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Old 09-26-2014, 02:06 PM
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That is a good to know. Glad you were able to save your engine.

However I would suggest retitilng this thread with "OM606" instead of "W124". Just so that it helps others find this info.
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  #3  
Old 09-26-2014, 02:39 PM
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Prior means earlier/before; I think maybe you have the dates incorrect. My 84 300D had 12mm x 1.250 threaded holes.
I thinkt the 10mm ones are on the latest Models.

Time Sert is not the only one available. Helicoils will also work. Helicoils are slighly less exensive and you do not need to enlarge the hole as much.
However, the Time Sert has a more elaborate kit.

If you want to see what kits are around do a search on eBay.

There is even a Kit that would work on VW Rabbits or My Volvo Diesel to renew the Injector Threads.
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Old 09-26-2014, 03:25 PM
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MB garage and others have said don't use heli oils for thie high compression engine of a diesel.
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Old 09-26-2014, 09:17 PM
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Quote:
Originally Posted by ohiomike View Post
MB garage and others have said don't use heli oils for thie high compression engine of a diesel.
The Glow Plug seals on the shoulder just behind where the tip stick out so the threads have nothing to do with the Sealing and there is supposed to be no Combustion Gasses getting past that Shoulder. If that happens that cavity fills with Carbon and can cause the Glow Plug to seize in the Bore.
There is also not much pressure that is going to push out against the Glow Plug because the Tip stick through the hole and into the Combustion Chamber.

Also neither the Time Sert or the Helicoil are stronger then the Metal that holds them in with the exception that the Steel internal Threads are stronger than the original Aluminum Threads and will resist cross threading better.

I only offered up the Helicoil issue to give People another alternative that is cheaper and more easily available.

I have personally seen Helicoils used to replace stripped Head Bolt threads in Diesel Truck Blocks and they do the same on Gassers. So I know they work on Diesels.


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