Hi all,

Does the oil pump recess get filled with fuel when running?

In the absence of any Threebond gasket maker I have sealed my oil pump blank plug with high temp red silicone gasket maker. My fault for being hasty, but in the small print I now see 'not suitable for parts which are subject to continuous immersion in gasoline'.

So, will my seal be compromised by the fuel/oil mix gushing up this hole, or can a silicone based gasket glue be used?

If it can't, any ideas how I would go about getting this plug out??

Cheers!

if your refering to the casings that the oil pump mounts to then no fuel goes near there mate
and if you have just used it instead of a gasket for a blanking plate it should be fine !
or just make a normal gasket with cereal box or if your posh gasket paper , lol

hth Gary

Yeah the hole that the pump shaft goes into. The one with the spinning cog/thread at the bottom that drives the pump. Does the fuel mix come up there? If not, then I should be sweet I'm hoping! It's already well sealed in and I don't want to go into the hassle of pulling it out for no reason.

I read it as you had fuel in there but NO there shouldn't be any fuel mix in that area.

HTH

Just be aware that the later MC21, & all MC28 crank cases also have a small auxiliary oil feed from the pump.
This feed hole obviously does go to the fuel wetted side, as it supplies the main bearing.
If present on your engine, the blanking plate will need to cover this hole too.

I used the Tyga blanking plug on a race bike engine, which didn't cover the hole. So I tapped a thread in the hole, & used a grub screw with Threebond to seal it. Then covered with some epoxy resin, to stop it vibrating loose.

WARNING!!!
When I tapped the thread, I was working on the split cases on the bench.
So I could remove all of the swarf.
If the engine is together in the bike, then don't tap the hole, as the swarf will fall into the main bearing area.

Thanks all, I'll stick with the current setup, which is the tyga blank plug sealed with silicone gasket glue.

Yes, this is an mc28 engine, so I have turned a small plug up on the lathe and plugged this hole too.

Interestingly, the last engine I was running had been built by someone else. The plug was simply installed and held in place with no sealant. Only found out when I was pulling it apart. Amazing it ran as long as it did!