Help! No oil pressure! 4.6 V8
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Help! No oil pressure! 4.6 V8
Just noticed my V8 has decided to have no oil pressure...
No apparent reason. Had it 2 days ago.
So could this be a stuck pressure release valve?
Can I get at that without taking the lump out or taking too much off the motor? I have good access to the front.
This is what I have:
No apparent reason. Had it 2 days ago.
So could this be a stuck pressure release valve?
Can I get at that without taking the lump out or taking too much off the motor? I have good access to the front.
This is what I have:
Re: Help! No oil pressure! 4.6 V8
So I dropped the oil, (black and smelly) and took off the oil pump cover.
The surface doesn't look good.
I don't know if the relief valve piston is in the right place?
The surface doesn't look good.
I don't know if the relief valve piston is in the right place?
Re: Help! No oil pressure! 4.6 V8
And another pic
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Re: Help! No oil pressure! 4.6 V8
Undo the big bolt on the left and pull out the spring and plunger, which should be moving freely.
Also verify whatever you are using as a gauge is working correctly. Wear and scoring would be typical and not a reason for "no" oil pressure.
Re: Help! No oil pressure! 4.6 V8
The wearing and scoring marks are normal.
But, do you get oil pressure if you rev it up?
Chris.
But, do you get oil pressure if you rev it up?
Chris.
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Series IIA 4.6 V8
R/R P38 4.6 V8
R/R L405 4.4 SDV8
Series IIA 4.6 V8
R/R P38 4.6 V8
R/R L405 4.4 SDV8
Re: Help! No oil pressure! 4.6 V8
No sign of oil pressure. I didn't want to rev the motor past 2k.
The gauge was working fine.
The motor sounds noisy so defo lacking pressure.
I'll check the valve for free movement.
I can easily clean up the cover plate and put in some uprated pump gears and then see how it runs.
I might pop the sump off to check for metal in the pan.
- Ian Anderson
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Re: Help! No oil pressure! 4.6 V8
Do you have oil? Was there a catastrophic leak? Sump plug come out?
Ian
Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.
Re: Help! No oil pressure! 4.6 V8
Make sure you pack the pump with Vaseline when you re-assemble or you’ll struggle to prime it
Re: Help! No oil pressure! 4.6 V8
No loss of oil at all.Ian Anderson wrote: ↑Sat Jul 10, 2021 8:28 pmDo you have oil? Was there a catastrophic leak? Sump plug come out?
Ian
I drained 4-5 litres out of the sump.
Re: Help! No oil pressure! 4.6 V8
Was the low oil pressure light on as well as the gauge reading low?rich112 wrote: ↑Sat Jul 10, 2021 9:19 pmNo loss of oil at all.Ian Anderson wrote: ↑Sat Jul 10, 2021 8:28 pmDo you have oil? Was there a catastrophic leak? Sump plug come out?
Ian
I drained 4-5 litres out of the sump.
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
Re: Help! No oil pressure! 4.6 V8
Yep. Sadly, I think it's probably spun a bearing. I'll take the sump off and see if I can check for metal and a lose big end... The pressure loss was not gradual.DaveEFI wrote: ↑Sat Jul 10, 2021 10:32 pmWas the low oil pressure light on as well as the gauge reading low?rich112 wrote: ↑Sat Jul 10, 2021 9:19 pmNo loss of oil at all.Ian Anderson wrote: ↑Sat Jul 10, 2021 8:28 pmDo you have oil? Was there a catastrophic leak? Sump plug come out?
Ian
I drained 4-5 litres out of the sump.
- Ian Anderson
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- Location: Edinburgh
Re: Help! No oil pressure! 4.6 V8
Check oil pick up bolts are tight and gasket intact or it will suck air.
Ian
Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.
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Re: Help! No oil pressure! 4.6 V8
Just what I was about to post as it happened to me. However, I didn't lose all pressure immediately, that would probably need the oil pick up to fall off into the sump.Ian Anderson wrote: ↑Sun Jul 11, 2021 6:45 amCheck oil pick up bolts are tight and gasket intact or it will suck air.
Ian
Re: Help! No oil pressure! 4.6 V8
I'd have thought if a bearing had failed enough to drop the oil pressure to zero, you'd hear it knocking?
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y