too much oil vapor coming from breather

[d10dano]

Hi guys Im new to this site. I just rebuilt my HH120 Tecumseh its on a 1966 sears suburban. Its was board .10 over I took it appart and saw the crosshatches in the cylinder. It looked great ,no ridge at the top. So I ran the hone through it ,bought a NOS set of tecumseh .10 over ring set ,checked ring gap all was good.Put it together and it runs great , but i noticed oil all over the front of the tractor.I can feel just a slight little puff of air from the breather tube. When I run it for 30/45 min I start seeing oil on the tractor???. The piston was in great shape ,thats why I cant figure out why so much oil vapor?? Anyone have an idea whats going on?? Is it due to the rings not beeing seated yet ?? Thanks for your help. Dan

 

[ILENGINE]

I hope that you cleaned the block with hot soapy water after honing the cylinder, otherwise the grit will stay in the crosshatch grooves and wipe out a set of rings as well as hope the cylinder within a couple hours of startup.

Even if the rings haven't seated yet, that still sounds a little excessive blowby.

 

[d10dano]

Thanks Ilengine, Yes I cleaned block after the cylinder work was done. I think I solved the problem,I noticed tha the breather cover was on with the tube at the lower righthand corner of the cover . I took it off and turned it to where the tube is at the top lefthand corner of the cover .Cut grass for an hour, no oil on the front of the tractor...:confused2: All is good so far..

 

[ILENGINE]

Thanx for posting the fix, most people don't.

 

[chance123]

Hi guys Im new to this site. I just rebuilt my HH120 Tecumseh its on a 1966 sears suburban. Its was board .10 over I took it appart and saw the crosshatches in the cylinder. It looked great ,no ridge at the top. So I ran the hone through it ,bought a NOS set of tecumseh .10 over ring set ,checked ring gap all was good.Put it together and it runs great , but i noticed oil all over the front of the tractor.I can feel just a slight little puff of air from the breather tube. When I run it for 30/45 min I start seeing oil on the tractor???. The piston was in great shape ,thats why I cant figure out why so much oil vapor?? Anyone have an idea whats going on?? Is it due to the rings not beeing seated yet ?? Thanks for your help. Dan

I am stumped or maybe didn't understand what you wrote.
You said "I took it appart and saw the crosshatches in the cylinder. It looked great ,no ridge at the top So I ran the hone through it."
My question is,, If you saw the crosshatch, and there was no ridge at the top, why did you "then" run a hone in the cyl?
You "might" have altered the necessary cross hatch to a point that the oil isn't spreading around in the cylinder and will "quickly" cause uneven wear. A newly rebuilt engine needs to be broken in so the rings seat. If the critical cross hatch has been ruined, you will get blow-by which is "excessive crankcase pressure" caused by the compression leaking through the poorly sealed rings.

 

[ILENGINE]

Just because part of the cross hatch is still there doesn't mean that the cylinder walls are not glazed. need to remove the glaze so the new rings will seat, unless using chrome rings, then don't hone. the chrome rings will wear into the cylinder.

 

[chance123]

Just because part of the cross hatch is still there doesn't mean that the cylinder walls are not glazed. need to remove the glaze so the new rings will seat, unless using chrome rings, then don't hone. the chrome rings will wear into the cylinder.

Yes but it was stated that the engine was just bored .010 over which would include a fresh cross hatch which is critical. Actually with chrome rings, it is the "cylinder" that wears/seats to the rings, not the other way around, because the cylinder is softer than hard chrome rings making the cross hatch even "more" critical for even oil distribution around the cylinder.

99% of all the small 2-stroke engines have their cylinder hard chrome plated (or nikicell) but not the rings. Once you see that plating worn off, you might as well trash that cylinder.

edit:
I re read your post " the chrome rings will wear into the cylinder." and yes that could be taken either way as the "cylinder" taking the wear/break in

 

[ILENGINE]

Yes but it was stated that the engine was just bored .010 over which would include a fresh cross hatch which is critical. Actually with chrome rings, it is the "cylinder" that wears/seats to the rings, not the other way around, because the cylinder is softer than hard chrome rings making the cross hatch even "more" critical for even oil distribution around the cylinder.

99% of all the small 2-stroke engines have their cylinder hard chrome plated (or nikicell) but not the rings. Once you see that plating worn off, you might as well trash that cylinder.

edit:
I re read your post " the chrome rings will wear into the cylinder." and yes that could be taken either way as the "cylinder" taking the wear/break in

That is what I meant. The chrome rings will wear the cylinder to the shape of the rings, but the rings will wear a little to.

 

[ILENGINE]

Yes but it was stated that the engine was just bored .010 over which would include a fresh cross hatch which is critical. Actually with chrome rings, it is the "cylinder" that wears/seats to the rings, not the other way around, because the cylinder is softer than hard chrome rings making the cross hatch even "more" critical for even oil distribution around the cylinder.

99% of all the small 2-stroke engines have their cylinder hard chrome plated (or nikicell) but not the rings. Once you see that plating worn off, you might as well trash that cylinder.

edit:
I re read your post " the chrome rings will wear into the cylinder." and yes that could be taken either way as the "cylinder" taking the wear/break in

That is what I meant. The chrome rings will wear the cylinder to the shape of the rings, but the rings will wear a little to.

 

[Rivets]

Got a question???? You said you installed .010 oversize rings. Did you install a .010 oversize piston? I hope so, because without it your rings aren't going to last long, too much play.