I have an early 1937 60 hp engine that I bought about 3 years ago. I did a compression test on the engine about a year ago, the engine had been sitting for quite some time in unknown storage. Anyway the compression test showed compressions to be random from 90 to 75 to 80 & 1 cylinder at 40 lbs. I wasn't able to do anything with my project till a couple weeks ago. I mounted the radiator, set up radiator hoses, filled the cooling system & started the engine. I ran the engine for about ten minutes, shut it off, let it sit for 24 hrs & rechecked the compressions. Compressions have improved a lot, lowest was 80 & the rest 90-95 lbs. The oil pressure was 25 lbs when first started & dropped to 10 lbs when warmed up. I put in a can of 5 minute flush & ran the engine again approx. 10 minutes.
The next day I drained the oil, added new oil & again checked the compressions, now there are 6 cylinders at 100 lbs & 2 at 90, the cylinder that was at 40 is at 100 now. When I drained the oil, the plug was full of sludge. Being worried about the low oil pressure when warm I pulled the engine, put it on my stand, removed the pan, I could see 3/4 ths of the oil pick up outline in the sludge build up.I removed main caps, bearings look good, crank journals smooth. Do you think the sludge in the pan could have restricted the oil flow enough to make my oil pressure low?
The next day I drained the oil, added new oil & again checked the compressions, now there are 6 cylinders at 100 lbs & 2 at 90, the cylinder that was at 40 is at 100 now. When I drained the oil, the plug was full of sludge. Being worried about the low oil pressure when warm I pulled the engine, put it on my stand, removed the pan, I could see 3/4 ths of the oil pick up outline in the sludge build up.I removed main caps, bearings look good, crank journals smooth. Do you think the sludge in the pan could have restricted the oil flow enough to make my oil pressure low?
