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Hi
I have just converted my HZ to 304 and I am now experiencing a rpoblem with oil pressure. As the HZ does not have an oil pressure guage at low idle the light flickers on and off. When the light is on an increase in revs extinguishes the light. Under normal driving the light stays off.
I have had a guage on it and the Oil pressure under load is between 40-50 and at idle is as low as 5-7
When doing the conversion i had to change the sump over to the 253 sump as well as the oil pick up. When installing the pickup I dont think or I cant remember putting on a new gasket. Is the gasket critical?
I have so far changed oil filters, replaced the oil, changed oil pumps, I have slipped in 1 x 6m washer in the pressure release valve in the oilpump in an attempt to increase oil pressure but at low revs or at idle the light either flickers or comes on.
I believe that I have only two options left:
1. pump on a high voluime pump or
2. puil the sump off and look at the oil pick up.
If i have to remove the sump is there an easy way of doing it short of having to pull the motor out.
Thanks in advance for you help
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Hi,308 oil pressure min at idle is 7 psi,,,,at 2000 revs 40-60 psi..check the warning light as I have heard they are crap,I always run a reliable/accurate oil/water gauge,but thats up to you,hope this helps(its from a book)
Jim in Adelaide.. |
Jim in Adelaide.. |
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Two things with these pickups. From memory yes you need a gasket. Secondly the screws that hold it on are not high tensile and stretch. I have snapped them before, also seen them tightened and had them snap afterwards. ALWAYS replace with high tensile versions. As Jim says though check with a good guage. Remember standard 253 and 308 oil pumps are prone to wear. I always replace them with a new oil pump too.
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I know of 3 people that forgot to install the pickup gasket and all had the same problem. I'll put my money on that.
"I would never want to be a member of a group whose symbol was a guy nailed to two pieces of wood" (George Carlin)
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the factory shop manual says the low oil pressure at idle is not a problem. however it should pick very quickly. from memory, I think anything from about 28psi while driving is acceptable.
40 or more psi is I think getting on the high side, a lot of people put in high pressure oil pumps in a street car but these are designed to be used in track vehicles that get stripped down regularly and have the bearings constantly checked and replaced.
too high a pressure for too long and you run the risk of the bearing metal washing out and the bearing failing.
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I've done same conversion, and the one thing I've noticed, and has been mentioned here a long time ago, was that genuine (ie GMH) oil filters will reduce the issue as they have a non-return valve??? from memory. I've run both and noticed a dramatic difference at idle. No diff at normal driving.
Never late in a V8 |
Never late in a V8 |
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THanks to all the problem was simple to fix all i had to do was replce the gasket between the pick up and block...bingo no more problmes...runs like a dream
thanks again
I have just converted my HZ to 304 and I am now experiencing a rpoblem with oil pressure. As the HZ does not have an oil pressure guage at low idle the light flickers on and off. When the light is on an increase in revs extinguishes the light. Under normal driving the light stays off.
I have had a guage on it and the Oil pressure under load is between 40-50 and at idle is as low as 5-7
When doing the conversion i had to change the sump over to the 253 sump as well as the oil pick up. When installing the pickup I dont think or I cant remember putting on a new gasket. Is the gasket critical?
I have so far changed oil filters, replaced the oil, changed oil pumps, I have slipped in 1 x 6m washer in the pressure release valve in the oilpump in an attempt to increase oil pressure but at low revs or at idle the light either flickers or comes on.
I believe that I have only two options left:
1. pump on a high voluime pump or
2. puil the sump off and look at the oil pick up.
If i have to remove the sump is there an easy way of doing it short of having to pull the motor out.
Thanks in advance for you help
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Does a high vol pump actually give any more pressure? Could it be the cam lobe worn and not driving the pump properly? Not sure if that is possible.
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The oil pump is not driven off a cam lobe, it is driven by a worm gear. You might be thinking of a 6-cyl fuel pump.
Dr Terry
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quote:
Originally posted by wbute
Does a high vol pump actually give any more pressure?
well, i suppose if you push more of something against the same size hole, pressure has to increase. cheap and cheerful way to slightly increase operating life on a well worn engine.
11.38@117mph will go quicker 11.34@121mph went quicker and faster, just not quick enough. now being rebuilt with less cam, much less comp, and a turbo.
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Well not knowing the internals of a high vol pump I was asking the question. As for high vol, they are high vol and not called high vol high pressure. High pressure and high volume do not always go hand in hand. Just though that might be logical.
When you look at the problem and a new pump has been tried already so surely the pump could be eliminated as the source of the problem. Perhaps the sender is the problem and not the oil pressure.
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The only way a positive displacement gear pump could loose pressure at idle is if it is worn out or not being driven properly or not getting enough oil feed into it. So if its an oil feed issue then changing the pump will show no change which has been done. I reckon its got to be either a pick up problem or the sender is RS.
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