Posted by Canadian Ken on March 10, 2013 at 18:29:48 from (74.114.77.140):
1967 powershift 4020 - I did a compression test on all cylinders - ranging from 350 psi to 70 psi . 10 psi more on all when oil was applied. We ended up pulling the engine and sending it to an engine shop. number 5 connecting rod bearing was spun and number 5 crankshaft bearing was spun. All piston rings were broken on all of the pistons into 3 pieces!!!! I can't believe that they could still start the tractor. There were holes in the sides of the pistons at the ring grooves that you could stick your finger in to!!! The engine shop told the farmer when he dropped off his engine,"the engine should have been brought in 20 years ago!!!The oil pickup screen was 3/4 plugged with sludge-we are going to plumb a gauge into oil gallery like Tim S did - the engine is all repaired and sitting on the floor of my shop -$4800 later -new camshaft -pump drive gear teeth were worn to a point. Now the next problem - I regret not checking the pto brake pressure when the tractor was running when it arrived at my place. The pto drives good but will not stop. I checked the linkage to the valve -all is clean and the nut #32 looks tight-the shaft is rotating. According to Tim S, the valve is hardly ever the braking problem, always the brake piston. Is there any point in removing and checking the valve components for broken link or o rings? I need to bolt the engine back on after I remove the clutch packs and the two bolts to finish the repair, or can I just remove the clutch packs, the two bolts, and remove the section of tractor to repair the brake on a bench?
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