Volvo Penta DP-G pressure testing

[frazion]

So after doing the shaft seals and gearshift seals (which were rusty as they come it turned out!) I've pressure tested and vacuum tested. pressure test holds 7-8 psi no problem, vacuum pulls 12.5inches and i cant get it higher, it then loses 1 inch over 3mins.

Now, im pretty sure that the new seals are holding, as is the dipstick and the vent screw (cant see any oil getting sucked in). i can't vouge for the drain plug where the vacuum pump is plugged in and i havent touched any of the other seals but there is clearly a small leak somewhere (my money at the moment is on the drain plug connector to the pump).

I guess the question to the experts is....is 12.5 to 11.5 still ok? or am i asking for trouble?

 

[gery w]

Most common place for vaccum leaks is at the input shaft seal as it's only a single lip seal.

Lay it in such a way where you can pool some oil round the seal and try again

 

[frazion]

Thanks,

I had the drive on it’s bum with its shaft in the air, oil pooled round both shaft seals and gear change seal. Nothing, not even a Jurassic park ripple.

 

[gery w]

Thanks,

I had the drive on it’s bum with its shaft in the air, oil pooled round both shaft seals and gear change seal. Nothing, not even a Jurassic park ripple.

Turn it the other way and try the same process on the input shaft seal.