Tweet
It seems I have heard that if the bypass spring is "weak", or if the valve is damaged, the result can be seen on the oil pressure gauge. Is this true, and if the valve is opening "early", what will the resultant gauge readings show - low, high? Are there different spring values available? Specifically for HP 427 engines with their oil pumps and the 80 lb gauges, is this spring/valve different than small blocks? If the valve is opening too easily or if the fiber valve is cracked or not seating correctly, is there an increased volume of unfiltered oil returned to the crankcase? Depending on where the tap for the pressure gauge is in the circuit would this be seen at the gauge?
-
-
Re: Oil Filter Bypass Spring/Valve
if the valve opens all that happens is that unfiltered oil gets to the engine. the reason for the valve is to let oil pressure to the engine if the filter gets plugged shut. on race car engines i block the valve with a 1/4 pipe plug to make sure that no unfiltered oil gets to the engine. -
Re: Oil Filter Bypass Spring/Valve
Everett-----
For any given year, the oil filter by-pass valve is the same for big blocks and for small blocks. 1956-67 engines used valve assembly GM #5573979. This valve is used with engines with cannister type oil filters. It is GM-discontinued, but available from reproduction sources.
The 68+ valve is incorporated into the oil filter adapter assembly. This assembly is GM #3952301 and it is still available for a GM list of $16.80. It is easily replaced at oil filter change time and, for 68+ owners, if you have any question about it, replace it.In Appreciation of John HinckleyComment
Comment