Mercury 90hp Four Stroke

[dendy]

I've done nearly 50 hours use in my new merc 90 4stroke. I've been very happy with the performance runs well starts well etc. However i've noticed it smokes periodicaly after it's first long run when i restart the motor after a couple of hours rest. It seems to do that only once. I've checked the oil levels and i haven't been losing any oil at all. I've spoken to my mechanic he said that some four strokes do this and not to worry about it. Has anybody had this problem? i would appreciate some feedback..thanks

 

[ebubeck]

Re: Mercury 90hp Four Stroke

Smokes from where?

 

[dendy]

Re: Mercury 90hp Four Stroke

Not sure exactly, seems to be just below the <br />cowling.

 

[hondon]

Re: Mercury 90hp Four Stroke

Any engine with a vertical crankshaft can have oil backflow into the cylinders when it is shut down. To eliminate this occurance simply tilt the engine up a little on shut down and that little cloud of smoke wo'nt be there when you next fire her off.

 

[WillyBWright]

Re: Mercury 90hp Four Stroke

Last explanation I had was that once in awhile the ring gaps line up and oil leaks in. It isn't much and never enough to foul a plug because it burns up at start-up and doesn't seem to be a problem once it's running. I like the tilting idea. It would be logical.

 

[dendy]

Re: Mercury 90hp Four Stroke

much appreciated guys, i'll give that tilting idea a go thanks again....cheers

 

[ozarkjeep]

Re: Mercury 90hp Four Stroke

Originally posted by WillyBWright:<br /> Last explanation I had was that once in awhile the ring gaps line up and oil leaks in. It isn't much and never enough to foul a plug because it burns up at start-up and doesn't seem to be a problem once it's running. I like the tilting idea. It would be logical.

Do the pistons not have locating pins to keep the ring gaps in a certain spot?<br /><br />I am not fameliar with the internals of those engines, but I would guess some type of valve stem seal is allowing the oil past it.