Perkins 6534 oil pressure

[kevindb880]

Any ideas why the engine oil pressure would drop after the engine has run a while?

 

[powerontheland]

Oil pump worn I expect

 

[kevindb880]

Cheers
Anyone know how difficult a job it is?

 

[Rs chunk]

Could also be slight wear in the crank and bearings showing up when engine gets warm and oil thin. What oil are you using? Any leaks from rear or front crankshaft seals

 

[kevindb880]

Not mine it's in tractor I'm thinking of buying!

 

[Shovelhands]

Changed the oil recently? Is it getting too hot?

Probably mains though.....

Has it got a gauge or a warning light?

 

[kevindb880]

It has a gauge, I think it's one to avoid maybe!

 

[Lofty]

What pressure are we talking about?

 

[Shovelhands]

Is the low pressure it's only fault? ......

 

[Kevtherev]

An oil change with a good quality oil may be all it needs

 

[kevindb880]

Owner says it's low but not right off the gauge, I think it's fine other than the low pressure! I will ask when the oil was last changed.

 

[multi power]

How many hours?

 

[kevindb880]

I will ask about hours as

 

[agrimax]

Check the oil is just that and not thinned with diesel too,but probably worn/oval crank journals.

 

[Mursal]

Straight or turboed?
If turboed, it wont like low oil pressure.

It has a gauge, I think it's one to avoid maybe!

Maybe not avoid, but put aside a good wedge if it needs shell bearings, shaft ground, and oil pump/gaskets, anything else will be a pleasant bonus.
Surely if he's telly you about the oil pressure, you can hammer him down? I would think he would have changed the oil beforehand, regardless of his answer? Check its not gear oil .........
Better knowing now ................

 

[agrimax]

Series 3 Muir Hill by any chance?

 

[REStracTORATION]

Could be gauge also
Put 20/50 oil in it, its like gaviscon in an old engine they dont like this new fancy thin oil
But all of above is to expected bit try the simples 1st if its cheap enough go for it and your handy enough with spanners then worth a punt.

 

[Mursal]

If it didn't go up in the first place, you might be more inclined to change the gauge, no?

 

[76masseyman]

Any ideas why the engine oil pressure would drop after the engine has run a while?

Yes, the oil has become less viscous due to it being warmer than at start up. If the needle is in the green with a few rpm's on, then I wouldn't be too concerned.
If it's an old engine, with a few hours under its belt, you can expect a bit of wear in it.

 

[Barleycorn]

We used to put straight 30 in the old Leylands. If you put detergent oil in they would burn a quart a day, and show low oil pressure.