pdasterly

iTrader: (4)

rebuilt engine, first start oil pressure is normal 40 psi then once engine warms to operating temp pressure drops to 10-15 psi, really low, check engine light might pop on. If i give some rpms the pressure goes up. replaced sending unit with same results. motor sounds healthy

RsSean

iTrader: (27)

Bearing tolerances?what oil pump did you put in? Pinched the o ring?

Johnnystock

iTrader: (6)

Pinched o ring x2

pdasterly

iTrader: (4)

i pray its a pinched ring, has ls1 oil pump

Sales4@Texas-Speed

iTrader: (4)

I would bet money on the o-ring.

pdasterly

iTrader: (4)

can i change to high pressure/volume spring for factory pump, who sells or pn#?

3rdCoastPowerSports

iTrader: (5)

if its a pinched o-ring changing to a higher volume spring would be like using a band aid to fix a broken arm. what did it feel like when you installed the oil pump... did you put the o-ring on the pick up tube and then install into the pump?

chrisfrost

iTrader: (8)

You can raise the high pressure bypass pressure by putting a cpl washers between the spring and the cap/bolt . But 3rd coast is right ,,,,,,,You need to somehow pull the pick up tube off far enough to check/replace correctly the o-ring ,,,,,,,,,,,hopefully that is the problem as that would be the easiest/cheapest possible problem in You're situation . Good luck

pdasterly

iTrader: (4)

shop assembled engine

pdasterly

iTrader: (4)

changed oil and pressure went back to 40+. once car warms up to operating temp i lose about half the pressure