Hello,
My 300e is using about a quart of oil every 1,000 miles and may be fouling a plug or two in the process so I'm thinking about replacing the valve stem seals. Any advice on what to look out for while doing this job would be greatly appreciated. Found the following post on another site and dropped it in this post for comments on whether it sounds like a valid approach.
Also looking for a good quality valve spring compressor that will work on my particular engine. Saw this one on the Snap On site but have no idea whether it will work.
Thanks,
Mike
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Hi
Changed the valve stem oil seals on my 190E about 2 years ago or more although it made little or no difference to oil consumption. Ayway here goes Remove HT leads from rocker cover Remove rocker cover Remove Spark plugs Remove oil spray bar Remove camshaft bearing covers/rockers The valves are all now visible and the engine can be turned over carefully with a socket on crank (not cam!!!)until the no. 1 piston is at TDC viewed through plug hole. Now this is where it gets scary Tap the spring of the 2 valves on no. 1 piston with a hammer and drift to break the seal on the collets. Use a valve spring compressor to squeeze the spring (the 1 i had was borrowed it was snap on great tool) and be very careful not to drop the collrts remove collets and spring . Valve will fall slightly onto top of piston remove oil seal and replace with new one lub it before fitting. Refit vave spring and collets. Repeat for second valve on no. 1 piston Turn engine over until no. 2 is at TDC and repeat. Repeat until all 8 valves are done. Reassemble using clean oil on bearings etc.
Points to note: Inlet and Exhaust seals are different. Do not turn engine over when valve springs are removed. Tapping the spring to release seal on collets you are using the piston to restrain the valve be sensible. Search and get the right tool for the spring compression make one is possible. Make sure the piston you are removing the springs on is at TDC if it is not the valve could fall into the chamber!!!!!!!! Do not puncture rad with socket on crank bolt.
Good luck
This was over 2 yrs ago
230K