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Author Topic: low oil pressure?  (Read 1395 times)

Offline aaron1980

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low oil pressure?
« on: 15 March 2011, 20:23 »
i have had this rattle for a while now and im sure its oil pressure the lifters rattle and there is a deep rattle as well. some times it gos and then comes back. i have pulled the rocker cover off and turned the engine over and there is oil getting to the top but not loads? i have changed the oil pump and its still the same the cam chane seems fine. any advice as to where my oil pressure is going would be good :embarassed:
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Offline Wayne

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Re: low oil pressure?
« Reply #1 on: 15 March 2011, 20:50 »
Have you fitted a gauge and seen what oil pressure you have.
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Offline aaron1980

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Re: low oil pressure?
« Reply #2 on: 16 March 2011, 20:10 »
i put a gauge on it today and it was running at about 1 bar (14psi) at 2000 rpm so thats about half what it should be? when i had a look at the drive for the oil pump through the hole that is capped off in the block oil is pouring out of the shaft itself. im starting to wonder if there should be some sort of ball bearing or similar in that cap to restrict the oil flow and that is missing so letting the oil bypass the filter housing back to the sump?
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Offline Ben Lessani

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Re: low oil pressure?
« Reply #3 on: 19 March 2011, 11:00 »
At 2k rpm it should be more like 4 bar. Idle is 1 bar.

Where did you put the gauge, head / oil cooler.
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Offline aaron1980

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Re: low oil pressure?
« Reply #4 on: 19 March 2011, 20:39 »
i put it in the top of the oil filter housing? i know it must be low as i can hear the tappets ratteling and what sounds like a main bearing. :undecided:
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Offline Wayne

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Re: low oil pressure?
« Reply #5 on: 19 March 2011, 20:54 »
Quote from: aaron1980 on 19 March 2011, 20:39
i put it in the top of the oil filter housing? i know it must be low as i can hear the tappets ratteling and what sounds like a main bearing. :undecided:

Retest but from the side of the head.
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Offline rubjonny

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Re: low oil pressure?
« Reply #6 on: 21 March 2011, 11:35 »
from the filter housing will give you a higher pressure than at the head, so if its 1bar at filter housing you really do have a problem. pump is dead or the pickup is blocked.  some 16v have a plunger thing in the distributor blank hole, there was a discussion on CGTI which suggested that if this was not extending it could result in low oil pressure iirc?
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Hello my name is John and I'm a dub addict.

Offline aaron1980

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Re: low oil pressure?
« Reply #7 on: 21 March 2011, 17:22 »
Hi thanks for the help i have removed that bung where you can see the top of the pump shaft and it is hollow like something should push up into it but there is nouthing there? i had the man from the local garage look at it and he says its must be oil pressure and hes sure its a noise from the crank :cry:
i rearly need to get this worked out o else im going to have to find another engine and hope i have better luck with that
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Offline aaron1980

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Re: low oil pressure?
« Reply #8 on: 26 March 2011, 14:56 »
Hi just a quick update my lack of oil pressure seems to of been down to the wrong size main bearings. when i rebuilt it i sent the crank away to get it checked and they surpplied the bearings which i then fitted (without checking  :undecided:) so it was my mistake. now i have the wright size bearings im hoping to get it built back up as soon as possible and hope fully it wont rattle  :smiley:
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