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Garden Tractors Discussion Forum

Re: Tecumseh ???

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07-17-2013 11:53:27

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In order to have compression, the engine must first bring in a charge of air/fuel mixture to compress. With both valves closed, the engine CANNOT bring in air or fuel. Also, there CANNOT be manifold vacuum with intake valve closed.

Regarding possible problem with valve timing, NOT LIKELY!! In order to have a p[roblem with valve timing, the engine would have to have been disassembled to quite a bit more than you have described.

An engine is basically an air pump. Intake valve opens, and piston travels downward to draw in a fuel/air charge. Valve closes, and charge is compressed. At some point near top center, spark is provided by ignition system, and mixture is burned causing piston to travel downwards on power stroke.

NOW, using deductive reasoning, does it not follow that if pushrods are removed, and valves remain closed, the cycle is disrupted? You need to have the pushrods installed, valves adjusted, and correct engine rotation to evaluate possible problem with compression.

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07-19-2013 07:52:29

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 Re: Tecumseh ??? in reply to jimg.allentown, 07-17-2013 11:53:27  
Yep that"s right its a basic "suck,squeeze,bang ,blow" sequence, and with the push rods out nothing should be right in that sequence.
I expected to have either a resistance to squeezing what air was in the cylinder or resistance of trying to suck in air, i just get a nice easy roll over[by hand].But the valves are working in sequence and at the right times.
I should of cleared the air that its back together, valves set and still the same no compression,intake of air, when i wrote of the last test, my bad?
End result will depend on the owners decision of what to do with it, obvious more surgery, and time required.
Many thanks for the info and time/effort spent
play safe

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07-19-2013 12:11:58

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 Re: Tecumseh ??? in reply to Phil25, 07-19-2013 07:52:29  
All things considered, engines do not lose compression suddenly without involving a major mechanical failure - like a swallowed valve, dislocated seat, or a hole in a piston. Rings fail over a longer period of time, and generally are accompanied with some smoking and oil consumption.

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