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low oil pressure
by
Smokey Eddy
on 24 Sep, 2011 19:04
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I just changed main and rod bearings <500km ago as well as lifters about 20,000km ago.
All the bearings were done when I built the engine about 40-50k ago. So the I'M shaft bearings are a little old but from what could see they looked ok.
I know the oil pump would be the next logical spot to go.
Opinions?
Cold. Idle 2000 3000+
50 75 100+
Warm 25 30/40 50
HOT 5-10 12 <20
Those numbers seem really low to me for having fresh bearings.
I'm running lubro moly fully synthetic 5w35 ( or 5w40)
It's a 1.9 aaz with a really old garret t3 from a previous 1990 1.6td.
I'm wondering if the turbo is spilling the pressure.
I changed the cold side seals and bearings but the hot side was fused shut.
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#1
by
Wayland
on 24 Sep, 2011 19:38
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Did you replace the oil pump when you built the engine, or at least measure the gear backlash?
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#2
by
Smokey Eddy
on 24 Sep, 2011 19:47
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I did not!
I'm asking if you all reckon an old turbo bleeds more oil or a worn pump causes lower pressure.
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#3
by
Wayland
on 24 Sep, 2011 19:50
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I would strongly suspect the pump.
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#4
by
Smokey Eddy
on 24 Sep, 2011 20:08
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Even if the turbo is really old? It still boosts great though...
I'll replace the pump.
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#5
by
fatmobile
on 24 Sep, 2011 22:10
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You can prime the pump with a drill and watch to see how much flows past the cam journals.
I've had those bleed off oil pressure.
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#6
by
Smokey Eddy
on 24 Sep, 2011 23:06
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Hmm that's interesting although I wouldn't know what is too much?
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#7
by
fatmobile
on 26 Sep, 2011 22:22
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I hadn't done this before,.. but knew when it was flowing too much oil from journal 5.
I did check it with plastigauge after seeing it.
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#8
by
Smokey Eddy
on 26 Sep, 2011 22:26
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The head isn't very old but the turbo and pump are very old. Especially in comparison. were yours pretty aged by this point?
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#9
by
rallydiesel
on 27 Sep, 2011 09:15
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Where are you reading from? Those numbers don't seem that terrible. I had an oil pressure gauge that read about 10 psi too low (VDO). Is your oil warning light blinking?
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#10
by
Smokey Eddy
on 27 Sep, 2011 11:20
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No blinking lights. Read from the cylinder head.
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#11
by
BigVWman
on 27 Sep, 2011 14:17
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numbers aren't super bad. Doesn't head oil sender trigger a light at about 4.5psi and filter flange somewhere around 18-23 at 2000rpm?
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#12
by
Smokey Eddy
on 27 Sep, 2011 14:36
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I re-routed the one at the head to the filter flange
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#13
by
burn_your_money
on 27 Sep, 2011 16:00
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I re-routed the one at the head to the filter flange
That sounds like a bad idea to me.
Measure the oil pressure at the flange. If it is within specs then the oil pump is ok.
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#14
by
Smokey Eddy
on 27 Sep, 2011 16:06
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Thanks fellers