knuckle47
Advanced Contributor
"Had a few recent issues with
"Had a few recent issues with carb backfiring that took 3 weekends to solve and seems to have been a cracked sparkplug. Motor runs beautifully but the oil pressure gauge is indicating low pressure after about 20-30 minutes of running. Motor does not smoke, heat up or tap (like my old 62 Ford back in 1981) The oil level is normal and IF I throttle back and run under 3000 RPM, within 10 minutes the oil pressure is back to 45 or so. Throttle up to 3400 or more and the pressure seems to sink back down to 15-20psi. At one point the pressue was about 5. Again motor does not overheat, or make any unusual sounds. I am guessing It could be a bad dual station sending unit. I did change the oil and noticed some sludge in the old oil on the bottom of the bucket so I flushed the crankcase out with new oil, ran it for 30 minutes and then sucked that out to re-fill AGAIN with new oil and filter after I saw this happening BUT...it is still happening. Can anyone provide another possibility beside the obvious oil pump, relief spring or filter problems? Is there something that can cause sporadic oil pressure shifts I am overlooking? These motors run very strong but had 600 hours. This season, we added about 150 more hours and I thought MAYBE we just stirred enough junk up to move the old solids around and have been getting it cleared out via these oil changes ?????"
"Had a few recent issues with carb backfiring that took 3 weekends to solve and seems to have been a cracked sparkplug. Motor runs beautifully but the oil pressure gauge is indicating low pressure after about 20-30 minutes of running. Motor does not smoke, heat up or tap (like my old 62 Ford back in 1981) The oil level is normal and IF I throttle back and run under 3000 RPM, within 10 minutes the oil pressure is back to 45 or so. Throttle up to 3400 or more and the pressure seems to sink back down to 15-20psi. At one point the pressue was about 5. Again motor does not overheat, or make any unusual sounds. I am guessing It could be a bad dual station sending unit. I did change the oil and noticed some sludge in the old oil on the bottom of the bucket so I flushed the crankcase out with new oil, ran it for 30 minutes and then sucked that out to re-fill AGAIN with new oil and filter after I saw this happening BUT...it is still happening. Can anyone provide another possibility beside the obvious oil pump, relief spring or filter problems? Is there something that can cause sporadic oil pressure shifts I am overlooking? These motors run very strong but had 600 hours. This season, we added about 150 more hours and I thought MAYBE we just stirred enough junk up to move the old solids around and have been getting it cleared out via these oil changes ?????"