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Tea 20 engine jamming


 
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stsew
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PostPosted: Thu Nov 07, 2019 6:55 am    Post subject: Tea 20 engine jamming Reply to specific post Reply with quote

Good Day.
My Tea 20 engine jams at slow rotation while turning with the hand crank. If I rotate it quickly it does not jam. Once it is jammed I have to reverse direction (flywheel backwards) to unjam it. I have removed the engine, starter, distributer and front case. Governor weights are in place. When it rotates it moves fine but when it jams it is solid. Any suggestions before I tear this engine apart? Steve
 
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Bruce(OR)
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PostPosted: Thu Nov 07, 2019 7:39 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

Not enough info. Why did you crank slow? What happened before this? It ran how? When did it happen originally? How did it come about?
Did you pull the plugs? Sticking valve?
Others will chime in shortly with vastly more experience than I have.
 
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John Deere D
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PostPosted: Thu Nov 07, 2019 8:41 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote


Remove inspection plate / Inlet oil pump screen...view the interior of the oil pan / engine...



Bob..












 
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stsew
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PostPosted: Thu Nov 07, 2019 9:12 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

I bought this tractor in this condition. Thought it was seized but found it wasn't once I turned this engine backwards then forward again. As mentioned before, when I rotate it quickly with the handcrank it moves fine continually through many revolution. Once I stop then rotate the engine slowly it jams. Seems to have good compression so I don't think its a valve issue.
 
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Bruce(OR)
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PostPosted: Thu Nov 07, 2019 9:30 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

Valve sticks open and the piston hits it and closes it for you. . .
Had an AMC 345(?) engine that did that once upon a time. I was surprised the valve didn't get bent.
 
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Charles in Aus.
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PostPosted: Thu Nov 07, 2019 12:13 pm    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

Check valve springs for breaks or loose/missing collets. Rocker gear for loose tappet or broken thrust spring .
 
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Ron(Ont)
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PostPosted: Fri Nov 08, 2019 5:52 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

Try cranking it slowly with all 4 spark plugs removed. It may be just the compression that is stopping you.
 
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stsew
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PostPosted: Fri Nov 08, 2019 7:08 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

I have removed the spark plugs and the valves, springs, etc. seem to operate normally. Going to remove the head today to eliminate that area.
 
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John Deere D
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PostPosted: Fri Nov 08, 2019 8:48 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

99.99% of the time...if the liners are NOT secured...they shall move vertically when Crank is rotated...then bottom sealing rings MUST be replaced...coolant always leaks into oil pan...

Bob...Owner TEA-20..







 
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Jim L WA
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PostPosted: Fri Nov 08, 2019 10:14 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

Really? Did you read everything he said?
 
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Steve@Advance
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PostPosted: Fri Nov 08, 2019 3:41 pm    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

Look at the crank thrust bearing.

Is the flywheel still on? Broken starter drive pieces caught behind the flywheel?
 
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stsew
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PostPosted: Sat Nov 09, 2019 6:24 am    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

Pulled the head today. Found one bent pushrod. Upon investigation found the tappets (pushrod buckets) in no 2 cylinder seized or moving very little. This appears to be the problem and what was jamming the engine. I think if I had watched the operation of the valve train more closely I would of noticed this irregularity. I have not been able to remove the tappets yet but will post what I find.
 
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Bruce(OR)
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PostPosted: Sat Nov 09, 2019 9:26 pm    Post subject: Re: Tea 20 engine jamming Reply to specific post Reply with quote

So a sticking valve that the piston was closing for you. I understand.
Perhaps a lack of oil changes in the past.
 
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