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Garden Tractors Discussion Forum

Re: Tecumseh ???

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El Toro

07-17-2013 08:51:55
108.3.218.181



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When it won't suck gas is an indication of low intake manifold vacuum. Hal
PS: The rings on your piston may be stuck in their lans (ring grooves). Put the push rods back in and adjust the valves. Then see if both valves are ever closed when on the compression stroke. Your valve timing may be off.




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Phil25

07-17-2013 10:55:34
24.222.69.53



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 Re: Tecumseh ??? in reply to El Toro, 07-17-2013 08:51:55  
Afternoon: You just gave me a clue about it being possible to have the valve timing wrong?
i wonder when it was running,if the exhaust valve/pushrod fell apart first, messed up the timing, and hence the backfire and a dead engine?
Then i rememebered that i have both pushrods out now,and both valves are closed, and still no compression, guess its time to check those rings.
tks



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jimg.allentown

07-17-2013 11:53:27
108.16.14.32



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 Re: Tecumseh ??? in reply to Phil25, 07-17-2013 10:55:34  
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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Phil25

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
Tks
Phil

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jimg.allentown

07-19-2013 12:11:58
108.16.14.32



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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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