Rather than make my introduction thread painfully long, I thought it would be better to document the overhaul here.
To recap, I picked up an A4 at a local boatyard in unknown condition. It looked pretty good externally, it was complete and not horribly corroded, but they couldn't tell me when it had last run or if there were known problems. I decided that running it might do more harm than good, and I would never trust it unless I tore it down and made sure that all was well.
Before starting the tear down I did a compression check:
#1 100psi
#2 97psi
#3 97psi
#4 70psi
When I got the head off, the #4 valves looked dirtier than the others (pictures in the original thread).
I discovered the likely root of the problem with #4 as I removed the valves and found that the exhaust valve spring was broken.
To recap, I picked up an A4 at a local boatyard in unknown condition. It looked pretty good externally, it was complete and not horribly corroded, but they couldn't tell me when it had last run or if there were known problems. I decided that running it might do more harm than good, and I would never trust it unless I tore it down and made sure that all was well.
Before starting the tear down I did a compression check:
#1 100psi
#2 97psi
#3 97psi
#4 70psi
When I got the head off, the #4 valves looked dirtier than the others (pictures in the original thread).
I discovered the likely root of the problem with #4 as I removed the valves and found that the exhaust valve spring was broken.
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