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D-14, bent push rods

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Joe in AZ

06-15-2002 05:37:08




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I recently traded for a D-14. The previous owner had the head rebuilt, the valves seated etc. It missed bad and would not pull itself on the trailer so I winched it on. When I arrived at my place I started it and backed it down the ramp. I advanced and retarded the timing and no help. I removed the rocker arm cover and started the engine, some of the rocker arms were not meeting the push rods. I adjusted the rocker arms to meet with the push rods, noticing that at least one push rod was bent. I started the engine and the throttle was wide open and the engine roared. I backed the throttle off and the engine died and I noticed one of the push rods was bent bad enough to be missing the rocker arms. I then loosened the rocker arm assy and removed the push rods finding four of them bent. My question is; what caused the push rods to bend? If I replace the push rods with good push rods, will they bend? Do you suppose the valves are hitting the pistons? What do you suggest as my next step? Thanks for your help. If the engine were out of time, why would it have started and ran at high rpm?

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Trent Williams

06-16-2002 17:07:58




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 Re: D-14, bent push rods in reply to Joe in AZ, 06-15-2002 05:37:08  
You said the previous owner did head work. Does it look like anything else was done (cam, gears, ect..) If the head was the only thing removed, then the VALVE timming should be as it was. The valves should not be able to come close to the pistons. I don't think you could do anything to the IGNITION timming to cause this.



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Craig MO

06-15-2002 17:21:46




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 Re: D-14, bent push rods in reply to Joe in AZ, 06-15-2002 05:37:08  
It could have gotten water in it at on time and stuck the valves and the pistons pushed them back up. They could have been adjusted wrong when the head was put back on. The valve seats may not have been grond to proper specs. when it was done. The adjusters on the rocker arms might have worked loose at on time partly bending them if they tightened up. It could be any number of things. I would put new push rods in and adjust valves and make sure rokers are oiling as this is another posibility that the rocker arms scored from lack of oil. See how you get along after resetting and replacing.

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