Oil on Pistons (pics)
Thread Starter
TECH Regular
Joined: Nov 2001
Posts: 409
Likes: 0
Oil on Pistons (pics) Pulled my heads to do a swap to TFS 235cc and found oil on most pistons. Also all pistons where loose in their bores. The heads were completely dry. The only cause I can think of is too big piston ring gap. The engine was running fine but it would blow white smoke every once in a while.
What are your suggestions on the cause & what corrective actions should be made (other than new piston rings)?
What are your suggestions on the cause & what corrective actions should be made (other than new piston rings)?
White smoke is usually a sign of coolant burning. If you are not loosing oil, then I would guess it is not oil, but coolant. When you say the pistons are loose, how loose are you talking?
Keith
Keith
Yeah I would be looking for oil getting into your intake track like Tiago is suggesting. The white smoke can be either coolant or oil depending on where it is entering the motor it can also be blue or black which is more comon. And runnning a car real rich can cause build up on the pistons also usually not so wet looking though.
Actually you are right stevei I looked again and really don't see anything that bad I saw the one picture that looked wet, but forgot about pulling the heads and coolant etc... Looks like a little bit of carbon buikd up and not much more.
Thread Starter
TECH Regular
Joined: Nov 2001
Posts: 409
Likes: 0
Nope. The turbos, intercooler, intake manifold, cylinder heads are all dry
Iam sure it is not coolant as I haven't burned any. On the other hand my engine has always been using oil, initially it was 1 quart for 1k miles then prior to pulling the heads it was 1 quart for only 200 miles.
The pistons are rocking up, down, left & right in their bores. kinda like the piston slap thing. Looks like pistons/rings to wall clearance is too high.
If you look closely, the pistons has 2 layers of black coating on it ( you can even notice two colors). The lower coating is the regular carbon build up, while the top one looks like oil mixed with carbon.
The pistons are rocking up, down, left & right in their bores. kinda like the piston slap thing. Looks like pistons/rings to wall clearance is too high.
If you look closely, the pistons has 2 layers of black coating on it ( you can even notice two colors). The lower coating is the regular carbon build up, while the top one looks like oil mixed with carbon.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
