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Bob (mo) 
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Joined: 22 Nov 2009
Location: Missouri
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 Topic: 3.5 hp.Tecumseh engine ?
Posted: 21 Apr 2011 at 12:59am |
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My 3.5 hp Tecumseh motor on my Troy Bilt tiller threw a rod . What i need to know is- will the cam out of my 3.5 hp Tecumseh work in a 5 hp. Tecumseh ? I have found a 5 hp. Tecumseh that i can get pretty cheap but it does not have the extended cam shaft that runs the reverse . That is why i need to switch cams.Thanks for any advise you can give me
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scott
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Joined: 12 Sep 2009
Location: michigan
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Posted: 21 Apr 2011 at 6:15am |
Dont forget to count the teeth on the gear. I swapped cams into a minibike years ago, put a penny in the clutch and went to pushing. She'd fire off once in about ten feet of push when everything lined up just right. If I remember right I did the opposite and cut a long cam to fit in where a short cam came from.
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Orange Blood
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Joined: 29 Nov 2010
Location: ColoradoSprings
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Posted: 21 Apr 2011 at 6:25am |
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I'd say you are going to have to do some measuring, and what about the cranckcase cover, I am guessing the new one, will not have the opening for the cam, or a place for a seal?
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
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Posted: 21 Apr 2011 at 6:33am |
Your question is one reason why I like B&S over Tec! B&S have all the illustrated parts manuals online, easy to download, Tec doesn't(trys to keep them secret !).When I need to make sure 'does A fit into B', I jsut grab both B&S manuals.
For Tec, you might try going to www.partstree.com, enter in Tecumseh then the model number, but you have to have both engine model numbers.Once 'in' lookup the part,find the number, then compare to the other engine.Might take 10,15 minutes but time well spent.My 'gut' feeling says they'll be the same...but... good luck.
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Dakota Dave
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Joined: 12 Sep 2009
Location: ND
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Posted: 21 Apr 2011 at 8:12am |
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Go to a small engine shop a Tecumsech short block should be pretty cheap. they even come with a new head gasket. all you do is swap over you head, carb , exhaust, flywheel and shrouding. you'll need all the numbers off the tag
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DonDittmar
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Posted: 21 Apr 2011 at 8:25am |
www.smallenginewarehouse.com
Just buy a new motor, sure will save some time
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Bob (mo)
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Joined: 22 Nov 2009
Location: Missouri
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Posted: 21 Apr 2011 at 11:27am |
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Time i have, money i dont. The 5 hp.motors i am looking at on ebay are new .From what i can tell from pictures it looks like the new motors have a plug in cam hole and also from what ive seen it looks like the covers will interchange.
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 21 Apr 2011 at 11:55am |
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You think the cam gears for driving the cam alone are as sturdy as the gears for taking load off the cam? I don't. Cam alone may take a quarter hp while load on the cam shaft for the tiller could have to handle the whole engine horsepower. Makes for a lot thicker gears and a thicker cam shaft. Seeing as how Tecumseh's have no spare metal in the rest of the engine (especially the connecting rod cap and bolts) its unlikely the cam gears for a normal engine will be sturdy enough for full load on the cam shaft when the engine has that option.
Gerald J.
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Brian Jasper co. Ia
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Posted: 21 Apr 2011 at 11:59am |
Depends on which model of 5hp Tecumseh you're looking at. You probably have an H35 for the 3.5 eng. If it's going to work at all, you need an H50. There is also an HM50 that is like comparing a big block to a small block. Another difference is some of the H50's have the intake and exhaust ports reversed compared to the H35.
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