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Author Topic: low oil pressure  (Read 5576 times)

September 24, 2011, 10:04:51 pm

Smokey Eddy

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low oil pressure
« on: September 24, 2011, 10:04:51 pm »
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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Reply #1September 24, 2011, 10:38:22 pm

Wayland

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Re: low oil pressure
« Reply #1 on: September 24, 2011, 10:38:22 pm »
Did you replace the oil pump when you built the engine, or at least measure the gear backlash?
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Reply #2September 24, 2011, 10:47:38 pm

Smokey Eddy

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Re: low oil pressure
« Reply #2 on: September 24, 2011, 10:47:38 pm »
I did not! :D
I'm asking if you all reckon an old turbo bleeds more oil or a worn pump causes lower pressure.
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Reply #3September 24, 2011, 10:50:18 pm

Wayland

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Re: low oil pressure
« Reply #3 on: September 24, 2011, 10:50:18 pm »
I would strongly suspect the pump.
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Reply #4September 24, 2011, 11:08:07 pm

Smokey Eddy

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Re: low oil pressure
« Reply #4 on: September 24, 2011, 11:08:07 pm »
Even if the turbo is really old? It still boosts great though...
I'll replace the pump.
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Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD
Reply #5September 25, 2011, 01:10:40 am

fatmobile

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Re: low oil pressure
« Reply #5 on: September 25, 2011, 01:10:40 am »
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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Reply #6September 25, 2011, 02:06:27 am

Smokey Eddy

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Re: low oil pressure
« Reply #6 on: September 25, 2011, 02:06:27 am »
Hmm that's interesting although I wouldn't know what is too much?
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Blacked out mk2 AAZ Jetta RIP. You are missed.
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Reply #7September 27, 2011, 01:22:36 am

fatmobile

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Re: low oil pressure
« Reply #7 on: September 27, 2011, 01:22:36 am »
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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Reply #8September 27, 2011, 01:26:50 am

Smokey Eddy

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Re: low oil pressure
« Reply #8 on: September 27, 2011, 01:26:50 am »
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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Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD
Reply #9September 27, 2011, 12:15:24 pm

rallydiesel

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Re: low oil pressure
« Reply #9 on: September 27, 2011, 12:15:24 pm »
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?
« Last Edit: September 27, 2011, 12:17:11 pm by rallydiesel »
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Reply #10September 27, 2011, 02:20:17 pm

Smokey Eddy

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Re: low oil pressure
« Reply #10 on: September 27, 2011, 02:20:17 pm »
No blinking lights. Read from the cylinder head.
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Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD
Reply #11September 27, 2011, 05:17:57 pm

BigVWman

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Re: low oil pressure
« Reply #11 on: September 27, 2011, 05:17:57 pm »
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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Reply #12September 27, 2011, 05:36:29 pm

Smokey Eddy

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Re: low oil pressure
« Reply #12 on: September 27, 2011, 05:36:29 pm »
I re-routed the one at the head to the filter flange
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Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD
Reply #13September 27, 2011, 07:00:29 pm

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Re: low oil pressure
« Reply #13 on: September 27, 2011, 07:00:29 pm »
Quote from: Smokey Eddy on September 27, 2011, 05:36:29 pm
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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Reply #14September 27, 2011, 07:06:14 pm

Smokey Eddy

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Re: low oil pressure
« Reply #14 on: September 27, 2011, 07:06:14 pm »
Thanks fellers
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Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD
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