Valve seals for side valve tecumseh 7hp

[GhostFlame]

I've been taring up this board with questions about my ariens sno blo with tecumseh 7 hp engine. I have fixed a bunch of stuff. The engine is running good now.However, I am blowing oil out the breather on the valve cover on the side.

I think I need to replace the valve guide seals. I can't find anything on the net. I may not know what I'm looking for . what say you guys about how to do this

 

[bmod305]

Tecumseh flat heads didn't use any type of valve seal.

Dave

 

[boraticus]

After the engine has been run then shut off for a while (overnight) does the engine smoke at start up? If not, chances are that you've put too much oil in it.

The valve guide seals do not prevent exhaust gasses from getting past the valves. The valves will do that if properly adjusted and in good operating condition. The seals are to prevent oil from running down the valve stems and getting into the combustion chamber.

Take some oil out of the engine and see what that does for it.

 

[UNC017]

Originally Posted By: GhostFlame
I've been taring up this board with questions about my ariens sno blo with tecumseh 7 hp engine. I have fixed a bunch of stuff. The engine is running good now.However, I am blowing oil out the breather on the valve cover on the side.

I think I need to replace the valve guide seals. I can't find anything on the net. I may not know what I'm looking for . what say you guys about how to do this


Blowing out the breather isn't valve guides, that's more likely tired rings. I don't speak much Tecumseh to be honest, but if the breather is made like some other small engines, there's a spring loaded check valve that tries to keep a partial vacuum in the crankcase which can also stick or gum up and contribute to blowing oil out the breather.

 

[JTK]

+1 to your replies above. 1) There's no stem seals on these. 2) Try lowering your oil level and/or use a slightly 'heavier' oil like a 15w40. 3) She might be just worn out w/ too much blowby.

I'd change the oil and replace it with a 40wt. I forget what the spec'd oil amount is for this engine, but it's probably a half a quart?

Joel

 

[cronk]

How much oil is blowing out? Slight seepage from the vent tube is normal, if oil is dripping right out you may have an issue.
On some of these engines if you install the breather upside down, it could cause a leak, could have a bad breather there is a little baffle valve. You could try cleaning it in some kerosene.
For a snow blower engine I would stick to 10w30 oil, and as others have said, make sure it is not over filled.

 

[Cujet]

I have a 7HP Tecumseh Craftsman generator. It has a nice, 1 quart, plastic bottle that catches the breather "overflow". Weird setup, especially from the OEM.

My point is that this may be a characteristic of this engine design.

In my case, this bottle fills up slowly and every 5 hours or so, I need to check the oil level.

Not exactly "modern" quality!

 

[Propflux01]

Originally Posted By: boraticus
After the engine has been run then shut off for a while (overnight) does the engine smoke at start up? If so, chances are that you've put too much oil in it.

Take some oil out of the engine and see what that does for it.


+1

 

[GhostFlame]

Hey guys thanks for all the replies. I have been away from this project for awhile. Took a trip to the keys. Working hard and trying to find a new job and my garage was to cold.

It's 60 dgrees and all my spring maintance projects and chores are done and I want to go back to this job.

The engine runs good until I put a load on it and it stalls out. The new plug is oil fouled. I have been reading the aboce posts and it sounds like I barking up the wrong tree suspecting the valve seals.

The reed valve is installed properly and I think I replaced it back in Feb. I'll clean it and see if that helps. Someone said that I have tired rings. if I preplace the rings should I replace the piston and have the cylindar wall checked? Could the valevs themselves be bad or in need of lapping or adjusting?

Its pushing out more than a little oil out the breather it drips fast.

I have a good used engine here just in case. but, I want to conquer this problem. They didn't teach us this stuff in college. Might have been better than what they did teach me.

 

[GhostFlame]

... also it doesn't smoke ever that I can see and it starts right up. I just stalls under load.

Oh, where is that valve that keeps partial vacum?

 

[meep]

i don't recall a valve - just a baffle with some gauze in it, and the hole should be towards the top... maybe it has a hose fitting to go to the intake?? been a while. In my experience they either weep slightly, or that blatt oil out if the engine is tilted too far. never seen one-- even a worn one-- have a steady drip.

M

 

[RS700L]

My 8 horse Tecrapseh (MTD snow thrower) blows oil out the breather all the time since it was new, but I don't think as much as you are describing. The whole side of the machine can be covered in an oil film after one use.

Seems like there might be too much oil in it, or the breather valve is upside down or not sealing right.

As for stalling under load, could be running lean or the governor is messed up. Try leaving the choke on and running it under load - if it runs better, the mixture is too lean. I am grabbing at straws trying to diagnose a stalling engine that I can't see or hear, but that's what I'd try first.

It's a long shot, but if the governor is screwed up inside the motor, could it be throwing oil out the breather...I have never seen it, don't even know if it's possible, but it might explain both issues.

 

[Slick17601]

It's a Tecumseh...enough said. After dabbling in small engines since I was 14, I won't waist my time on one.

 

[meep]

Originally Posted By: Slick17601
It's a Tecumseh...enough said. After dabbling in small engines since I was 14, I won't waist my time on one.


awww... be nice and play with the other kids, wont you???
I found the old tec's to be easier to work on if you needed to do a tear down, or build from parts, than a briggs. I owned a bunch of Tecs, but only one briggs... it croaked in under 3 hours.... factory oil poured out with shrapnel. So I never had a good comfort with Briggs, much more with tec, and I liked tec's pressurized lubrication. So-- I was a tecumseh guy that today would not hesitate to buy a briggs, as long as it was an upper end model.

Peace!
M

 

[Hootbro]

Originally Posted By: meep
Originally Posted By: Slick17601
It's a Tecumseh...enough said. After dabbling in small engines since I was 14, I won't waist my time on one.


awww... be nice and play with the other kids, wont you???
I found the old tec's to be easier to work on if you needed to do a tear down, or build from parts, than a briggs. I owned a bunch of Tecs, but only one briggs... it croaked in under 3 hours.... factory oil poured out with shrapnel. So I never had a good comfort with Briggs, much more with tec, and I liked tec's pressurized lubrication. So-- I was a tecumseh guy that today would not hesitate to buy a briggs, as long as it was an upper end model.

Peace!
M


Just about every small engine maker has built a turd or two and I have heard the same stories about Tecumseh also. In the end though, Tecumseh is dead as a company and B&S is still there.