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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Cockshutt 40 stalled will not start

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Tony Holleman

06-15-2007 13:08:10




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I just bought a Cockshutt 40.It was running great. While cultivating the cultivator plugged up and the tractor stalled before I could hit the clutch. I tried to restart and it would only fire on two or three and the gas would pour out of the bottom of the carb. I checked the floats in the carb which seemed to work properly. I put the carb back on and now when cranking over gas does not flow out of the bottom of the carb and the motor does not fire at all. The carb is getting gas but when I pull the plugs they are dry.
I put gas directly in the plug holes and still no fire. The plugs are sparking OK. I appears the gas just is not getting into the cylinders from the carb. Any thoughts or ideas. Is it possible the timing jumped. The cylinder compressions range from 48 to 55.

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Mike (WA)

06-16-2007 08:32:28




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 Re: Cockshutt 40 stalled will not start in reply to Tony Holleman, 06-15-2007 13:08:10  
All of the other suggestions are good, but since this problem began suddenly (and as a result of the engine being stalled), I would suspect it jumped time. Check it like El Toro suggested.



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El Toro

06-15-2007 16:48:11




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 Re: Cockshutt 40 stalled will not start in reply to Tony Holleman, 06-15-2007 13:08:10  
Hold your hand over the throat of the carburetor and see if there's good suction on your hand while someone tries to start the engine. You need that manifold vacuum for pulling that atomized fuel into the combustion chambers. Worn rings, cylinders and valves not seating can cause low compression and poor manifold vacuum.

Squirt some oil into cylinders and see if the compression improves. You can bring No1 piston to TDC on the compression stroke and then remove the distrubutor cap and see where the rotor is pointing. It should be at the No1 plug tower.
Hal

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RAB

06-15-2007 15:44:29




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 Re: Cockshutt 40 stalled will not start in reply to Tony Holleman, 06-15-2007 13:08:10  
What colour were the plug electrodes when you removed them? Like - was fuel mixture weak? Could be an air leak (not a vacuum leak as as some say - there is nothing in a vacuum to leak!)on the inlet. Sounds like too little compression as well, if indeed the values are correct - pressure guages may not be very accurate - but they are all fairly close together, so that is good. have you tried a wet test as well? Compression may be an issue when hot. Are you sure you got the plug leads in the right order? With an old engine with no history it could be one or more of several issues. On one engine I have every woodruffe keyway was worn enough to allow a very wide variaion in timing. Is the choke working correctly after removal and replacement? Have you disturbed the needle settings on the carb? Are valve clearances correct? Is the float level correct and the float is not sticking?

I would initially look for an inlet leak.

Hope this helps.
Regards, RAB

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