Quote:
Originally Posted by DrLou
Just bought the above car - with the M112 engine. Starting with addressing misfires on a couple of cylinders - and cover gasket leaks...
Among other projects - and while I'm in there, Looking at doing a general update on the heads - Definitely needs valve cover gaskets, doing valve guide seals, and I don't think plugs have ever been changed on this 170k+ car... !
Am assuming(?) the bolts on the valve train are the torque-yield (on-time use) type? Do these bolts pass through completely? IE, are they actually head bolts? Anyone have specs on these bolts? Exact dimensions? want to order all I need before starting the project.
Should I replace the head bolts while I'm doing this? Alternatively, is there a high-mileage re-torquing spec on those bolts?
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I'm just curious to know why you're doing valve stem seals. Unless you have plugs that are extremely oil fouled, I don't know if I'd go through the trouble of replacing valve stem seals. Especially on the M112. If you're concerned about a misfire, I would start with plugs and a wire set for a random misfire and one of the coils for a dead miss. We've worked on these for years at my shop. Never had to do anything more serious than valve cover gaskets on the top. Even with over 300,000 mile on the clock. The first generation v-6 is the best engine that Mercedes ever bulit. Just my 2 cents.