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Spec for timing a Tecumseh TVM 140 70364L vertical crankshaft 4 cycle engine

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SOURCE: I have a mtd (Canadian Tire) Lawn Tractor, 13

Could be timing, but you didn't mention any repairs that could have gotten the timing off. You might check the gap of the points and the timing. The worst thing it could be is a valve problem. If the intake valve is leaking or not closing all the way it could cause backfiring through the carb. What did you mean when you said "fighting a compression stroke"?

Posted on Aug 29, 2009

Testimonial: "Hi. This is great! I have had no previous work done on the engine. When it is turning over it only cranks so far, then stops, even wiith a fully charg"

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Tecumseh OV691EA engine Carb spits, crankshaft stops when cylinders fire. Compression L-95 R-110


When you say crankshaft stops when cylinders fire I am assuming this is during start. This is caused by a flywheel key problem (Partially sheared) A flywheel key will partially shear if there was a sudden stoppage of the engine. I e. you hit something that stopped the blades right away.

Service manual is here:
http://www.mymowerparts.com/pdf/Tecumseh_Service_and_Repair_Manuals/TECUMSEH_SERVICE%20_REPAIR_MANUAL_V_TWIN_ENGINE_696325.PDF

Flywheel removal is on page 44 of the file.

I am pretty sure you have a flywheel key problem as this appears to be an engine timing problem and it is firing too soon. (again partially sheared flywheel key causes timing to advance. If there is not a problem with the flywheel key the next suspect would be the mechanical compression release.

A note about flyweel key replacement. Most of them are aluminum or soft metal so that the crankshaft does not shear off with a sudden engine stoppage. Just make sure to use a Tecumseh
replacement flywheel key and not one from an auto parts store.

Thanks for chooding FixYa,
Kelly

May 19, 2011 | Garden

1 Answer

Where do I find parts for a Tecumseh E-Z tiller?


Try www.partstree.com you will need to know the model and spec number of the engine. These numbers are either on a sticker on the fan shroud, or stamped into the metal of the shroud...usually near the spark plug.
Good luck.

Aug 31, 2010 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

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I have a mtd (Canadian Tire) Lawn Tractor, 13 years old. It is powered by a tecumseh 4 cycle OHV 12 hp vertical shaft engine. When i went to start today, it was fighting a compression stroke, then popping...


Could be timing, but you didn't mention any repairs that could have gotten the timing off. You might check the gap of the points and the timing. The worst thing it could be is a valve problem. If the intake valve is leaking or not closing all the way it could cause backfiring through the carb. What did you mean when you said "fighting a compression stroke"?

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1 Answer

4HP Tecumseh flat-head head-bolt torque?


check the numbers on the motor and you can contact Tecumseh or check their website for info, they are usually very good with their help

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1 Answer

Canaballing parts


Hello tim38663:

Depending on the Engine Model and Spec this Tecumseh Usually has the Same External Parts as a 15 HP to the 18 HP Single Cylinder Tecumseh Engines.
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

May 04, 2009 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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