stem seals yes! it all makes sense! the car used to start erratically then once running it was fine! so oil drips down the stem say over night leaving a puddle of oil then when you come to start it cough cough oil don't burn to well then once its been pushed out the exhaust it runs fine. and the leak is not that bad otherwise it would smoke ! but a leak never the less!Rs1 said:Stem seals on the oily cyl and bad piston/rings/bore on no. 4.
How many miles on that? Exhaustt valves are nice n clean and looking a tad lean(ish) too me.
now that sounds feezable, oil drips into cylinder (leaking stem seal) sitting on piston as before then i charge the cylinder with air and rock the crank to get the best result but having slightly opened the inlet valves, and ha presto oil escapes into the tract ! maybedicky said:excuse my ignorance but could the oil in the inlet tract be a result of the leakdown test?
leesturbo said:no 4 piston out and it looks perfect to me ! wtf (the worst leakdown result)
only observation was that the ring gaps where not at 180deg from each other unless thats not right either ?
was hot from what i remember ??artfulmatt said:mine are the same - I put it down to the bore gap being so large that you get blow by when cold - until the piston is hot enough to expand and fill the gap
hense why I said were the engine hot when u done the leak down ????
your still gonna see some blow by when cold - looking at mine from pics I have, they ain't quite so bad as yours lolleesturbo said:was hot from what i remember ??
but heat only gona expand piston not rings, i think its a case of driving TOO gently when running in, it needs some revs and load to bed in the rings ??? !!!