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I've only performed one other valve job on a car, and the valves were noticeably damaged, so I knew to replace them. How do these valves look? Particularly the one with the chipped edge (in the spotlight)? Should I replace that one, or any others?
I plan to see if any of the valves leak tomorrow. But if no leaks are found, should I replace any of the valves?
for me those look like carbon accumulation...
and maybe detonation on the bottom one? although bottom one look more corrosion?
All 4 cylinders are having different combustion patterns...
I guess I could see that as carbon build up. Does it scrape off or is the valve missing a piece?
I took a wire wheel to them today, and yes, it looks like it was carbon build up. Maybe I'll put them in a chem bath, and take a closer look at the seats, etc.
Yeah, this car has a blown head gasket. Exhaust gases were making their way into the coolant system. Maybe that explains the different combustion patterns.
If anyone more experienced than I could give me some advice for these 2 questions, I'd greatly appreciate it. I intended this repair to be a budget effort, but I'm afraid my mistakes will cost a lot more.
While re-installing piston number 1, I bent the oil control ring as well as the ring land. The ring land is not too bad, but it extends beyond the diameter of the rest of the piston. I'll see if I can get a picture of it. Should I get a new piston?
I also scratched the cylinder wall turning the crank a couple times. Is this scratch bad enough to pull the block, or is it not that big of a deal? I can feel the scratch with my fingers, but I can pass a fingernail over it without catching.
And here's the piston with the bent edge of the ring land.
Last edited by mcslayer; Aug 10, 2022 at 11:06 PM.
If anyone is interested, I ended up boring out the block to .040 thousands over, and reassembled the entire engine with new valves, new pistons, piston rings, main bearings, and rod bearings. I just fired up the engine this week, and it runs great. I plan to continue the break in.
Also, after scratching the cylinder wall the first time, I heard the phrase "does the scratch catch a fingernail?" everywhere. But what I learned was if you can feel the scratch at all while looking away, you should probably fix it (bore out again). That's what is meant by the "does it catch a fingernail" phrase. If the scratches are merely pencil lines and you can't feel them while looking away, you don't have to worry.
