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[Andy H]

Stick another lump in it...?

New to Trade Club - VXPRO engines and cylinder heads (news 01/10/2009 )

Our remanufactured engines and cylinder heads are produced using only genuine GM derived parts – so the quality is exactly the same as the original.

On Vauxhall Trade Club (today)

Omega ('94-'03)
Engines
Application    Description    Part No.    Retail    Trade    Trade Club    Wish List
2.2i 16v - Z22XE       R1000143A    £1,364.00    £1,364.00    £1,364.00    
2.6i 24v - Y26SE       R1000146A    £1,532.00    £1,532.00    £1,532.00    
3.2i 24v V6 - Y32SE       R1000151A    £1,641.00    £1,641.00    £1,641.00    

[2woody]

it is possible to do this with the engine in place, but in reality, it's easier to take it out.

Oil pump failure is very unlikely to be the cause of the low pressure. I'd actually not be that concerned with 15psi at idle, provided it goes up a lot with engine speed. An audible knock when you're on the move means that the engine is dead in reality.

Just say that you find the root cause - and for the sake of argument, the pick-up strainer has come loose. Then you'll need to take the engine out, get the crank re-ground and reassemble with new bearings (plus oil pump if you no longer trust it). Reattaching the strainer and fitting a new pump isn't going to cure it once its started knocking.

To me, its tappet noise. Not deep bottom end noise.

It seems to get worse as engine heats (and oil thins?).

I have recently made exactly that mistake......

[Shackeng]

Is it likely that the low oil pressure is related to the tapping noise (little end perhaps?), I know very little about these engine internals, but little ends used to fail in the past. Or is it possibly a damaged lifter? Could that cause reduced oil pressure?

...Just thinking aloud.

[tunnie]

Thing is, if its a damaged lifter it would make the sound from cold. Its only as oil thins when there is an issue, sounds like multiple tappets.

[feeutfo]

Thicker oil then?

Although Kevin's thoughts about oil flow also spring to mind.

[tunnie]

Thicker oil then?

Although Kevin's thoughts about oil flow also spring to mind.

I think its worth a go? See if it makes any impact.

Question is, what grade?

[aaronjb]

You could try a 10W50 (same when cold, better temperature handling) or 15W50 fully synth (thicker in all conditions), but be aware you're trading flow for pressure as someone else said.

Not that I can see the oil being hot enough in an Omega to need anything special, oil wise.