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12.5 Hp Tecumseh Engine wont Start


Petrie's Avatar
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03-14-13, 05:54 AM   #1  
12.5 Hp Tecumseh Engine wont Start

I was given a roper lawn Mower with a Tecumseh engine OVXL120-202043c ser. 0989R
engine leaking oil through the mounting flange gasket
The local parts shop told me that they could not get rings for this model any more so I rebuilt it with the same rings
I have got gas and spark but the engine wont start
I checked the compression and only have 60 psi could this be the problum not enough compression
I think I should have at least 100 psi if so where can I get after markte rings for this engine
Any help would be apriciated

Petrie

 
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03-14-13, 06:48 AM   #2  
The compression or lack of is the problem. The old rings may be just part of the problem. The other may be the condition of the cylinder. Even with new rings you may have more work to do.

You need to either check the runout of the cylinder or have a machine shop do it. This would be the difference in the diameter of the cylinder at the top of the wear to the bottom. If it's too far out of specs the block would have to be bored to straighten it out. The wear on the cylinder is usually at a right angle to the crankshaft.

 
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03-14-13, 07:48 AM   #3  
Tecumseh stopped making engines in the US in 2008. I have also heard that they are no longer making spare parts so if you decide to rebuild you may have to use aftermarket brand parts or find parts intended for a different different engine that would fit.

 
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03-14-13, 04:01 PM   #4  
I'm showing the ring set (35776b) available & in stock in Canada..I didn"t check aftermarket, but the OEM are available.... Roger

 
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03-16-13, 05:14 AM   #5  
Would You have the web site if it is not in my favorites i spend ages trying to find things

Petrie

 
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03-16-13, 05:21 AM   #6  
I will take it apart again and check the cylinders for run out
and acording to rodgers the rings a avalible in canadathat I will try and findbecause the mowers is worth fixing

thanks for your help
Petrie

 
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03-17-13, 01:29 AM   #7  
I just looked them up using the engine # you posted earlier (OVXL120-202043c ser. 0989R ) & checked inventory @ the wherehouse as I was putting in an order for other Tecumseh parts. If your local guy cant get them, Im sure a Google search will come up lots of places.. Roger

 
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03-17-13, 10:28 AM   #8  
Thanks Hopkins2
I will google it like you did & see if I can come up with in canada

thsnks again Petrie

 
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03-17-13, 03:03 PM   #9  
With the engine torn down, you may want to also check the valves (seats, valves themselves for warp-age or burned spots) and the movement of the valves (open to fully closed.

Also look at the head/head gasket for any signs of blowby. A leaking head gasket can be the problem of low compression, as well as the rings/cylinder.

Most of these things you've likely already thought of, but just mentioning them.

 
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