sbc high oil pressure
#1
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sbc high oil pressure
On my ski boats 350 last year before winterizing it I was changing the oil and accidently filled it with 20w-50 when I started it I noticed higher than normal oil pressure. I thought no big deal next year I'll put in 10w–30 and it will be normal. So this year comes I change the oil and the pressure is still high 55 at idle and over 90 if I rev it.
Ive tried two different mechanical gages
Tried installing a new oil pump and filter bypass
The motor has 120 hours runs like a top and had zero shavings in the pan
Im thinking a bearing has spun and is bloccking an oil hole
Any advice?
what route does the oil take? Cam or crank first
Ive tried two different mechanical gages
Tried installing a new oil pump and filter bypass
The motor has 120 hours runs like a top and had zero shavings in the pan
Im thinking a bearing has spun and is bloccking an oil hole
Any advice?
what route does the oil take? Cam or crank first
#3
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On my ski boats 350 last year before winterizing it I was changing the oil and accidently filled it with 20w-50 when I started it I noticed higher than normal oil pressure. I thought no big deal next year I'll put in 10w–30 and it will be normal. So this year comes I change the oil and the pressure is still high 55 at idle and over 90 if I rev it.
Ive tried two different mechanical gages
Tried installing a new oil pump and filter bypass
The motor has 120 hours runs like a top and had zero shavings in the pan
Im thinking a bearing has spun and is bloccking an oil hole
Any advice?
what route does the oil take? Cam or crank first
Ive tried two different mechanical gages
Tried installing a new oil pump and filter bypass
The motor has 120 hours runs like a top and had zero shavings in the pan
Im thinking a bearing has spun and is bloccking an oil hole
Any advice?
what route does the oil take? Cam or crank first
#4
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Yep I've changed filter again from a delco to a k&n and I swapped the filter bypass valve at the same time. It's not a remote filter so no lines to mix up
#5
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Yoda,
Which oil pump did you use ? The filter bypass really has nothing to do with oil pressure. If you are "truly" getting 90 lbs, I would think that the bypass valve in the pump is stuck shut, unless you used some type of high pressure pump, but even those dont generally make 90lbs.
Yup, I know, its a new pump, but that dont mean squat.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
Which oil pump did you use ? The filter bypass really has nothing to do with oil pressure. If you are "truly" getting 90 lbs, I would think that the bypass valve in the pump is stuck shut, unless you used some type of high pressure pump, but even those dont generally make 90lbs.
Yup, I know, its a new pump, but that dont mean squat.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
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i shimmed a dodge slant six bypass once. blew the oil filter apart in 5 seconds. my vote goes with pump bypass. while you are in there, check the mains and replace the rod bearings.
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I just pulled it apart mains and rods look like the day I put them in. I think I'm going to put in a used pump I have here just to see what happens. Both pumps are melling the original was a high volume. The new one is a standard flow m-55
Thanks for the responses
Neil
Thanks for the responses
Neil
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I've been thinking about the relief valve on the pump if it was stuck closed wouldn't I only see high pressure at higher rpms? Or is the relief valve opening all the time on a normal engine.
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fixx
did the pump come with another spring? usually the pump comes with the high pressure spring installed already..if it came with the extra spring then take i think the purple one out and install the lower pressure yellow spring,,this should give you cold 60 psi and 25 psi hot at idle..
Last edited by FIXX; 03-23-2012 at 11:10 PM.
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