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Sun Dec 22, 2002 4:40 pm

68 camper is leaking oil, dumping all of it very quickly. I have replaced teh main seal, flywheel seal, oil cooler seals and thought maybe it was tranny fluid so I replaced tranny main seal. After starting the bus, it still dumps all of its oil and it looks like it is coming from crack between teh tranny and engine.

Any ideas where the leak may be coming from?
Thanks!

Sun Dec 22, 2002 9:13 pm

Since it's the type 1 engine it could very well be a crack IN the engine. They all crack eventually and cracks behind the flywheel are fairly common. However, these usually leak when the engine is hot and you indicated the leak occurs almost immediately after startup. The worse oil leak I ever had was on a camping trip in 0 degree weather and the camshaft end cap broke off and I would lose a quart of oil every 5-10 miles. As it turned out the cap, which looks like a Coke bottle cap, had been installed backward by the previous rebuilder and was rubbing on the end of the cam until it broke off. This was on a type IV engine and I understand the cam cap is installed the opposite direction on the type 1 engine so that probably explained why it was installed this way. This would have been noticable when you had the flywheel off, but I would certainly double check it if you have to remove the engine again. Good luck.

Sun Dec 22, 2002 9:36 pm

I think gokayaking has got it going the right direction... pull the flywheel again, but wait..., first before you do... have you grabbed ahold of the front pulley and checked for beat out rear main bearing/too much end play?
grab ahold of it and push/pull it back and forword. If you have alot of play and a THUNKING noise then the rear main in the case is beat out and you will not get a rear seal to not leak...due to the amount of travel of the crank/flywheel
If you know the case/rear main is not beat out then like he says it's likely a crack in case... it could be that one of the smaller diameter "oil galley plugs" and not the camshaft plug is the culprit. I have seen numerous cases crack and the crack runs right to the area where these smaller plugs are and high oil pressure when it's cold can cause them to blow out/ leak....
Well a few more things to check out anyway... good luck and let us know what you find...

Mon Dec 23, 2002 6:40 am

Just a history lesson on those cam plugs. They can't be installed incorrect. When the motor came down the line at the factory, the guy putting on the flywheel would look and see if the plug was an "inny" or an "outy". If it was an "inny," he would put an automatic tourque converter on it. An outy would recieve a flywheel.

Mon Dec 23, 2002 9:57 am

Your correct about the cam plugs on the type1/3 engines, I think gokayaking was referring to a type 4 situation where the plug was incorrectly installed.

I have seen the rear main so beat out of engines(uprights) that the flywheel rubbed through the cam plug and in fact rubbed on the whole backside of the case.... needless to say these instances are extreme and the cases are junk as you cannot align bore/thrust cut one that has gone that far.
Anyway, like I stated before if the rear main/case is beat out you will not be able to keep a rear main seal from leaking...