11-03-2022, 03:59 PM
Dennis
Engines which are heavy breathers do blow a lot of oil mist into the pump, this can cause a leak from the pin, particularly if the engine is a very heavy breather.
Or the normal breathing of the engine is not as good as it should be - sometimes the valve chest breathers for example are blocked off by owners.
I have seen 'oil control' gaskets, which are basically a piece of rubber with a slit in them for the operating lever. I'm not sure how good these are at preventing this, my guess is they are not very good.
Also there should be a seal between the body of the pump and the rod thats on the bottom of the diaphragm. That is often missing (and isn't included in any of the T or U type repair kits I've seen. With this missing it allows oil mist at the area under the diaphragm. There is a drain hole in the area in question of the pump bottom casting, (this is I am lead to believe to be a tell tale to see if the diaphragm is leaking and to prevent filling your crankcase with petrol if it is). and the oil will eventually leak out of the drain. You can fashion a seal here out of a bit of rubber, a couple of washers (which you need to file a slot in, and a suitable spring.
Engines which are heavy breathers do blow a lot of oil mist into the pump, this can cause a leak from the pin, particularly if the engine is a very heavy breather.
Or the normal breathing of the engine is not as good as it should be - sometimes the valve chest breathers for example are blocked off by owners.
I have seen 'oil control' gaskets, which are basically a piece of rubber with a slit in them for the operating lever. I'm not sure how good these are at preventing this, my guess is they are not very good.
Also there should be a seal between the body of the pump and the rod thats on the bottom of the diaphragm. That is often missing (and isn't included in any of the T or U type repair kits I've seen. With this missing it allows oil mist at the area under the diaphragm. There is a drain hole in the area in question of the pump bottom casting, (this is I am lead to believe to be a tell tale to see if the diaphragm is leaking and to prevent filling your crankcase with petrol if it is). and the oil will eventually leak out of the drain. You can fashion a seal here out of a bit of rubber, a couple of washers (which you need to file a slot in, and a suitable spring.