Posted by ScottyHOMEy on June 05, 2009 at 12:12:00 from (64.222.247.252):
In Reply to: Super C oil pressure posted by thumbanger on June 05, 2009 at 11:33:03:
If by a quarter-gauge you mean just out of the red zone, and that's at half throttle or better after the oil has warmed up and thinned out, meaning also that the gaps in the main and rod bearings have opened up, too, I expect you want to be keeping a thought about some some new bearings and maybe a crank grinding to go with it in the back of your mind.
Prior to that, I'd suggest a couple of things much less extreme. I don't know how many motors you work on, but between my own and the neighbors, I've found it handy to have an extra gauge around as a test gauge. Unless you have a new gauge on there, it might not hurt to buy a decent oil pressure gauge (I got a Stewart Warner for pretty reasonable at NAPA) that reads in psi. Thread it on in place of the one you have (it's a 1/4" NPT thread) and see what you have. The drop in pressure as the motor heats up (gaps open, oil thins) is normal, but it's good to know what kind of pressure you actually have. The needle may swing more than the Rochester gauges, so go by the reading, not the swing of the needle. The relief valve on the pump is set to kick in at 50-60# so something in the 50 range =/- 5-7 when warm is fine.
If it is low at half throttle and above, then you need to have a look at your oil pump, which is a matter of dropping your pand and removing two bolts. A clean screen on the pickup is obviously a good idea (as is a clean pan!), but it may be the shaft and cover are worn so that the end play is costing you pressure. Search on oil pump in this forum and you'll find all manner of threads on how to evaluate that.
It may still be your crank bearings, but I'd eliminate these two before I started after the crank.
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