Please, please, please, be very careful when adjusting oil line check valve spring tension (stretching them), it is extremely easy to go "too far", and/or destroy the spring. Springs may also be gently collapsed between thumb and finger to reduce pressure, if they are stretched too far, but key here is to be very gentle with them.
The proper way to do it is to fabricate up a fitting to use a hand actuated air pump, to pump air through the line with it off the engine. One pumps, watches the air pressure on the gauge, and listens for the valve to open, or "blow off". Then if the spring needs to be adjusted to give a higher blow off pressure, the spring gets stretched GENTLY until the proper pressure is attained.
One variation on listening for the blow off point, is what I have been doing for about 3 - 1/2 decades now, I submerge the valve end into a clear plastic tray filled with water. It is easier to both hear, and see bubbles when blow off occurs.
Correct check valve blow off pressure is 4.6 lbs PSI.
A serious CAUTION, DO NOT use air sourced from a commercial, or home air compressor, they can extremely over pressure the valve, and destroy the valve spring.
New complete oil lines are available from member sources on these boards, if in doubt, seek help, and realize there are alternatives.
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