Diesel injector bolt threads.

[Trillion]

I've seen a few cars for sale now that are "Spares or Repairs" because they have thrown an injector out and the holding bolts thread has gone.

Not owning a CRD I'm wondering is there anything stopping you from just going one size up on the securing bolts? As they can be helicoiled by the looks of things I would have thought not???????

[Alfie1]

When I changed my injectors a couple of years ago I bought (from ebay,natch) some repair kits for this very problem, I think I had one that stripped on removal and a new OEM bolt couldn't be used. The kit included a short replacement bolt and helicoil with instructions to use certain size tap and just screw it in, it was quite clear to understand and easy to do and I replaced all 4 injectors without problem.

The kits at the time were £25 per stud (2014) and I've since covered 25k miles without problem. Also had to buy tools for injector removing (slide hammer and attachments) and for seat recutting which I could probably have gotten away without doing.

Tom

[Lankytim]

I had a problem with a couple of injector seals leaking and one of the injector securing bolts broke as I was tightening it. A local guy who specialises in broken studs and bolts came round the next morning and for £80 he drilled out the old bolt, helicoiled the hole and drilled out the mounting yoke , allowing me to fit a larger bolt. Apparently broken injector mounting bolts are an ongoing issue on Mercedes diesel engines and this method is an accepted repair.