MF507 no oil pressure

[Vladman]

Greetings from Slovakia! I have an older Massey Ferguson MF507 with Perkins A6.354 engine. When I start the engine has no oil pressure. Then remove the oil filter, put the hose in the engine and pull the oil up.
I refit the oil filter and start. The oil pressure is between 4-5. It is ok.And at work the oil pressure is still ok.So only at the first start when the combine longer stands is with the pressure problem.
Please, does anyone know why this is ??? Thank you very much for your reply. Best regards Vladman

 

[Mursal]

4 -5 bar (1 bar = about 15psi)?

Strainer in the sump might be partially blocked, just a bit of work to get in at it.
A bit of wear on the oil pump ..........

 

[Exfarmer]

Some oil filters have a by pass valve, I would suggest finding a genuine filter, if the one you have is not

 

[Vladman]

yes it is possible ..... I wonder if this engine has a relief valve mounted on an oil pump? Or is it integrated in the oil filter?I have Baldwin Bt237 oil filter.

 

[Mursal]

Oil pressure relief valve will be in the engine not the filter.

 

[Exfarmer]

Some filters have non return valve to stop oil draining after stopping. I cannot remember which this engine should have

 

[agrimax]

I'd say the pressure relief valve is staying open slightly when the engine is stopped,allowing the pump to drain which in turn cannot reprime when started because the RV is still open. Whether the filter has an anti drain back valve or not won't matter.It's only there to give instant oil pressure when starting,as the filter should already be kept full. No anti drain back and the filter has to fill first before there's pressure.
IIRC, the relief valve is attached to the oil pump by a short tube and also bolted to the block and thus the oil gallery.
That Baldwin filter has both anti drain back and bypass valves fitted.

 

[Vladman]

So ......... what can I do, I have to remove the engine from the combine to get down to the oil sump and then the pump.

 

[agrimax]

Afraid so........

 

[Mursal]

You could try over filling it with oil, just incase you have a leaking suction pipe in the sump.
It wont cost much to try it, if no response drain back to the mark.

 

[Vladman]

You mean to mount the original Perkins filter there? In my country it is a bit of a problem to get Perkins parts, but I will try it anyway ....

 

[agrimax]

Mursal means to overfill the sump with oil. Perhaps by an inch above the full mark.It would even be safe to go two inches above. The idea is to try and submerge the oil pick up pipe completely. You shouldn't need to start the engine.Just crank it over and see if the oil pressure builds on the gauge. But if you do get oil pressure then,you will still need the sump off to repair and be able to run safely at the correct oil level.

 

[startinghandle]

Greetings from Slovakia! I have an older Massey Ferguson MF507 with Perkins A6.354 engine. When I start the engine has no oil pressure. Then remove the oil filter, put the hose in the engine and pull the oil up.
I refit the oil filter and start. The oil pressure is between 4-5. It is ok.And at work the oil pressure is still ok.So only at the first start when the combine longer stands is with the pressure problem.
Please, does anyone know why this is ??? Thank you very much for your reply. Best regards Vladman

What do you mean by putting hose in the engine?
You say there is no oil pressure when you start the engine .....that would surely cause the engine to seize up
Is it possible for the gauge to be faulty?

 

[Vladman]

Agrimax - now I understand, thank you. I can try it, I think one inch (about 2.5cm) will be enough.

Startinghandle - when I start a cold engine and there is no pressure on the manometer, I turn off the engine and remove the oil filter. Then I put the hose into the oil outlet in the block (where it goes to the filter) and suck up my mouth for about 5 seconds. Refit the filter immediately and start. Then the oil pressure is already.

 

[startinghandle]

Now I understand

 

[Exfarmer]

Be wary overfilling if you work on steep slopes,

 

[startinghandle]

We used to have a. Mazda B2500 non turbo pickup which performed a lot better if the oil level was kept just above the minimum mark on dipstick and we have an old sawbench with
Petter PH1 engine and that is the same

 

[Mursal]

There you go .............

But how does the engine know the oil level, I wonder?

 

[MrNoo]

There you go .............

But how does the engine know the oil level, I wonder?

Less oil means less windage losses, used to run the race engines slightly below min level as they would rev up quicker. They make windage trays now to achieve the same effect, or just dry sump them to minimize losses.

 

[Mursal]

Everyday is a school day, thanks .......