5hp tecumseh engine too much compression

jimmyaAugust 5, 2014

I have this engine without start motor that I can hardly pull, is there some way to reduce the compression so an old man can start it? lol
Jimmy Alpha

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Possibly. What is your model and spec number?

    Bookmark   August 5, 2014 at 7:57PM
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The engine has no data plate, but it came off a Sears 536-909400 snow thrower. I understand it's a 5hp from the net, and a Tecumseh point kit fit like a ducks foot in the mud. Hence I feel it's a Tecumseh? lol

Engine runs like a top, just harder to pull than the 6.5hp I put on the snow thrower.

I'm hoping to replace a like new Clinton on an old "Merry Tiller' with it, and save the Clinton just to have as I have Clinton ties.

Thanks for any help...
Jim A

    Bookmark   August 5, 2014 at 9:03PM
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Look for a 143.xxxxxx number on the engine.
That's the Tecumseh prefix for "Sears" engines and can often be crossed for the specific Tec engine.

    Bookmark   August 5, 2014 at 10:57PM
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Your engine may have a compression release issue, which could be internal or from an excessive valve gap. Is there points in this? Could you be dealing with a timing issue? There were snow king engines based off both the small HS frame and medium H frame. Post a pic if you can't find the number. Of course, you will need to rig up an air box. Another option seeing as though this is a snow engine, maybe it has the provisions for an electric start.

    Bookmark   August 6, 2014 at 9:27PM
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gator_rider2(z8 Ga.)

I think needed carbon removed if hard to pull rope when builds up raise compression high hard to pull and brake rope.

    Bookmark   August 7, 2014 at 8:03PM
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OP - Gator Rider2 makes a good point about carbon buildup in that older Tecumseh 5HP engine cyl chamber.... such could make it much harder to crank with a rope pull start due to increased compression.
I have a 5 HP Tec on a chipper/shredder with a rope pull start and it does not pull hard.. starts/runs well.
Might be worth either running a special additive thru the fuel supply or pulling the head & giving the cyl/piston head a good scraping...

    Bookmark   August 8, 2014 at 8:34AM
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The carbon on piston makes sense as a snow blower engine most likely had choke always partly on in the cold? I'll check it out today Thanks for the hints, I'll post back what I find.

    Bookmark   August 8, 2014 at 9:13AM
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Removed .015 to .030 carbon from head and top of piston and now pulls and starts as it should, thanks for the tips! I would never thought of carbon build up, thanks again...
Please close this thread.

    Bookmark   August 8, 2014 at 5:31PM
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we learn from reach other, eh? But Gold Star goes to Gator Rider2 on this particular one... :)
Hope that old Tec gives you many more years of service.

    Bookmark   August 8, 2014 at 6:41PM
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