New info - leakdown test results
Well, I did a leakdown test using a rubber-tipped blow gun and my air compressor. After "bumping" the engine around to make sure both valves were closed on cyl #1, I pressurized the cylinder only to hear air rushing up from the crankcase. The same results on cyls 2,3,and 4, although I did have to adjust some of the valves for clearance. Cylinder # 5 had no detectable leakdown, and would turn the engine until this piston was at BDC. This is the same cylinder that showed over 300 psi on a compression check.
My problem is in the bottom end of this engine. What I don't understand yet is why cylinder #5 is still so good. The PO reported that his wife was driving the car at 70 mph when it just died and coasted to a halt. If I assume that it overheated and the pistons got into contact with the cylinder liners, why does
#5 still check out OK?
I guess I'll pull the head off as soon as I get a chance, and have a closer look.
Pistons for these engines sure are expensive, what are the odds that I won't have to buy a set?
SteveM.
|