Diesel engine, bent valve?

Posted by ADKdude on June 27, 2005 at 10:27:09 from (24.75.240.34):

Hi guys. Sorry this is a bit long winded. I am trying to help my buddy fix his deutz allis 5230 with a Toyosha diesel engine.
The tractor ground to a halt about a year ago with massive loss of power. Upon removal of the valve cover we found two pushrods were broken and a two of the caps holding the rocker shaft down were broken. we replaced the pushrods and caps last weekend, did the valve clearances. To turn the engine over we stuck it in high gear, removed glow plugs and heaved on the jacked up back wheel. Something however was not right. The engine would turn over a bit then would not turn over any more coming to an abrupt stop. It seemed as though one of the valve springs was fully compressed with the coils pressed against each other so the engine couldn't turn over any more. If we back the wheel off in teh otehr direction the valve would suddenly pop out with a loud click.
Could this be a bent valve? Wouldn't a bent valve slowly jam in the guide not come to an abrupt stop? If I loosen the clearance adjusters the engine turns over OK. If a valve stuck could the piston actually hit the valve? Could the valve timing have changed and the piston hit the valve? We tried to start the engine it turned over and fired but made a horrible noise, One of the rocker shaft caps broke, the pushrods were OK this time. What does it all mean? We'll pull the head off in the next few days but any ideas?

Follow Ups:

• Re: Diesel engine, bent valve? Kelly MT 22:41:17 06/28/05 (0)
• Re: Diesel engine, bent valve? LBA 17:33:44 06/27/05 (0)
• Re: Diesel engine, bent valve? Bob 11:10:26 06/27/05 (2)
  • Re: Diesel engine, bent valve? ADKdude 06:56:00 08/16/05 (0)
  • Re: Diesel engine, bent valve? Russ Smart 19:37:33 06/27/05 (0)

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