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knock in Diesel

D

Dave from Texas

Member
I was trying to help a friend diagnose a knock in a 72 HP Leland diesel tractor. The valve seam to be adjusted about right. I can not hear the knock when cranking. Sound appears to be in the back cylinder. Oil is pumping but it does not have a guage. It quick knocking for about a minute but started back. Any ideas? I was not much help. I suggested taking the oil pan off to see if we could see any problem. That is all I know to check.
 
To try to determine which cylinder your knock is in undo (partly) the fuel line to each injector as the tractor is running (first off safety - there is very high pressure fuel here, do not get your hands or any other body part near it, also there is an inherant fire risk). If killing one of the cylinders causes your knock to dissapear then you have a better idea of where to start looking. Alternatively a good long screwdriver/broomhandle or similar can be used to listen to various parts of the block to see where the knock is the loudest. Simply place one end against where you wish to listen and the other against your ear (beware of the fan!). Hope this helps, Sam
 
I used the screw listening trick and it was loudest on the head of the back cylinder. I was afraid it was a rod or worn rod bearing. It sound like metal hitting metal.
 
Dave: One other possibility, is the knock loudest through the radiator, in other words when your standing directly in front of tractor. Bent valve push rod will do that one, and is as loud as any knock I've heard.
 
Considering a knock that comes and goes, My guess would be something on top of piston. Next, alternating oil volume or pressure.
 
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