3.2 Top End Rebuild Advice

[Rot 911]

Originally posted by 1972_911T
its using about 0.8 of a litre per 1000km no really obvious smoke when warm just a little when you blip the throttle, and hes asking for 2.5k for the engine which seems resonable as breakers in the UK are asking for 4k plus you cannot see them running and dont know that they are any better!

My opinion: The oil usage of that engine is still within Porsche specs. Unless you just feel the need to rebuild the engine I think you can still get quite a few miles out of it as is. To confirm my belief I would do a leakdown test. The compression numbers look very good!

[1972_911T]

I have now picked this engine up and have removed the intakes on removing the intakes I have noticed that the oil breather hose inlet has lots of fresh oil inside when I placed my finger in the hole it came out covered in oil. The previous owner reported that the plug on #2 cylinder was regularly fouled on inspecting the intake port on this cylinder it is visibly oilier than the rest however the oil is higher up than the valve the gasket between the intake and the head was really oily and the #2 intake walls were covered in a film of oil as is the rest of the intakes.

Could the smoking and increased consumption reported by the previous owner be due to oil getting into the oil breather rather than the valves stems, the previous owner did say he thought the consumption seemed to decrease as the oil level dropped. If he was overfilling would you expect a massive amount of smoke of could he just be doing it to a level where only a small amount of oil was entering the intakes?

[1972_911T]

Well this afternoon I got a bit carried away with claening up my new engine and now its stripped down to the case on one side. Must say everything looks in pretty good shape the cylinders look like they have just been freshly honed.



The heads seem in good condition with no obvious valve damage



How can I tell if my pistons are badly worn or if I can just replace the rings?

[JeremyD]

Measure em... But you should be OK.

My heads looked better than yours and my guides were shot

[JeremyD]

[snowman]

One thing that can be done to improve valve guides is to use a grape style ball hone on the new guide. The honing process produces a cross hatch pattern, just like the cylinders have. The cross hatch is very important because it holds oil. The oil lubes the valve guide and prevents wear.