Quik95SC
SCCoA Member
Well after determining it wasn't the EGR valve or PVC valve, or vacuum leaks I did a compression test and found #5 cylinder only has 30 lbs of compression. Thinking I may have Blown HG's I took the heads off and noticed no bad HG, everything looked. Still has to be a reason for 30 lbs of compression. I went ahead and pulled the entire engine to look for a broken piston ring. Although not really thinking it was because the cylinder walls didn't show any signs of scratching of the walls. Took #5 piston out and rings look good. Then noticed a horrible thing. The entire piston was cracked on both sides.
I went ahead and took the rest of them out and didn't see any more indication of bad pistons or cracks. Engine only has about 10K miles on it.
I have ordered a new piston and a complete set of rod bearings. I have left the crank in it because the crank looks very good with no abnormal wear.
I have new rings already and plan on honing the cylinders to get the new rings to seat properly.
I know a question already.
What else should I be concerned/aware of in replacing only 1 piston if anything at all?
Coming to the Shootout, so do I need to give it a gentle break in period before I run in on the dyno and track? 300-500 miles or so on the new hardware?
Any suggestion are very welcome and solicited!
Smitty
I went ahead and took the rest of them out and didn't see any more indication of bad pistons or cracks. Engine only has about 10K miles on it.
I have ordered a new piston and a complete set of rod bearings. I have left the crank in it because the crank looks very good with no abnormal wear.
I have new rings already and plan on honing the cylinders to get the new rings to seat properly.
I know a question already.
What else should I be concerned/aware of in replacing only 1 piston if anything at all?
Coming to the Shootout, so do I need to give it a gentle break in period before I run in on the dyno and track? 300-500 miles or so on the new hardware?
Any suggestion are very welcome and solicited!
Smitty