9.9 bottom crankcase seals

[Chris H]

Can any one tell me which way up I should have the Bottom end crank case seals inserted, the manuel doesn't make it very clear, also If these seals have gone bad would i be getting an oil type resadue out of the
out-let by the prop.

 

[yelladog]

Re: 9.9 bottom crankcase seals

I just replace the upper seal on my 73 25 Evinrude and on it, the seal goes cupped side down and soild side up. Don't know about the residue, but mine was leaking oil out onto the outside of the motor.

 

[RPJS]

Re: 9.9 bottom crankcase seals

The lip of the seal should be toward the engine.
What you are seeing at the prop is probably a mixture of unburnt fuel and exhaust carbon and is a normal occurance, it can be minimised by doing a decarb on the engine also if you spend a lot of time running low revs when you use the engine run at WOT for about 10min before you come off the water.

 

[OBJ]

Re: 9.9 bottom crankcase seals

There are two seals in the lower crankcase head....an upper seal and a lower seal. The upper seal lips should be pointing away from the crank and the lower seal should point toward the crank.

Oily residue from the exhaust can be caused by poor ignition, a cold running block, too much oil in the fuel, extended low rpm running....Try the suggestions by RPJS.

 

[Chris H]

Re: 9.9 bottom crankcase seals

Thanks All, I have now put it all back and the engine runs, only problem seams to be doesn't wont to idle, goes great other wise, if I pull chock in and out consantly it will keep running all be it not smoth when in gear it runs fine, I'm thinking its a carb problem, also the tell tell water dosnt seam to get hot ?, thanks again for the help last.