Oil On Top Of PistonsHow to guides
Posted 30 September 2018 - 10:23 AM
Posted 03 October 2018 - 03:41 PM
There are three ways oil can get to the piston crowns.
1. head gasket breach between an oil gallery and the combustion chamber, but this is most likely to affect one cylinder only.
2. valve problem - stem seals are a common weak point or worn valve guides, but new seals should reduce consumption.
3. rings are not sealing properly. Ring grooves can wear, but also rings can get clogged with sludge. They require a certain amount of combustion gases to get behind the piston rings to force them out against the walls of the cylinder.
On my engine I ended up replacing the rings, and at the same time honed the block in situ and fitted new big end bearings at the same time.
I got a set of rings from Ebay - Toyota ones, came from Dubai.
Posted 06 October 2018 - 08:55 AM
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