Prima M50 - Oil leaking from sump pump outlet...

[autarh]

Hi ,
i have issue with oil drain sump pump... When engine running sump pump start to raise (lever) and oil start draining from faucet... It is not a large amount but it is significant...

Any idea why this is happening ?

Oil pressure seems ok .. but sometimes when turning the engine pressure drop real fast under 2 seconds, usually it takes 10-15 seconds

 

[omega2]

crank case pressure? remove oil filler cap when running and see "how she blows"

 

[autarh]

As i can see she blows fine : )

 

[omega2]

Instead of a piece of paper put your hand over the hole, if the pressure tries to move it your engine is breathing heavy and a rebore is nigh.

 

[autarh]

I have just done rebore, about 30 engine hours ago .
On 20th hour, i have changed oil, filters and etc ... but even before that problem start to occurs

i tried as u have suggest and there is no big pressure...

 

[omega2]

In that case are you sure there is no "lock down" on the pump plunger? Maybe Latestarter of this parish can assist further.

 

[Latestarter1]

I have just done rebore, about 30 engine hours ago .
On 20th hour, i have changed oil, filters and etc ... but even before that problem start to occurs

i tried as u have suggest and there is no big pressure...

It is normal good practice to fit isolating valve to bottom of the oil change pump, this prevents any crankcase pressure causing blowby to push residual lube oil out of pump body.

If you have had recent rebore get the engine loaded up and give its neck a good wringing, running light load was probably the cause of previous blowby. Give motor some hard work to do!