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07-11-01, 02:02 PM   #1  
On a techumseh 143.996504 I installed a new crankshaft.I aligned the to marks on the crankshaft and the camshaft but I'm getting to much compression its not releasing and its hard to pull start. Any suggestions?

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07-11-01, 06:13 PM   #2  
Hello and Welcome Alan Rondin to the Do It Yourself Web Site and my Small Engine forum.

Tecumseh engines use three different types of markings on the crankshafts.

One type is a beveled tooth on the crankshaft.
Another is the keyway on the crankshaft.
The other is hobbing hole on the camshaft.

The numbers 143 indicates a Sears mower.
Tecumseh claims in their repair manual that some engines build for Sears are timed one tooth off.

Per the Tecumseh instructions for some Sears engines that are NOT equipped with a mechanical governor, the timing mark on the cam gear should be one tooth advanced. {clockwise ahead of the crankshaft mark.}

There could be other problems.
Check the flywheels position.
Check the valves.
Check for liquid gas inside the cyclinder head.

Some crankshafts had a mechanical commpression release on the main gear of the crankshaft.

Try cranking the engine without the spark plug installed. If it still cranks hard, it's likely an internal engine problem...

Regards and Good Luck,
Accurate Power Equipment Company.
Small Engine Service and Repair Technician.
Personal Quote:
"If it ain't broke, don't fix it until it is broken!"
Bare in mind my company no longer services nor repairs lawn and garden powered equipment. Rest assured and fully confident, the help I offer you is based upon my prior years in this industry, with this type of equipment and is specific and accurate to the best of my knowledge...

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