Broken valve spring

rlsprothero

New User
I have a John Deere 310 A tractor. I have a
broken valve spring. I believe it's the
exhaust valve because the engine is
backfiring out the intake. I pulled the valve
cover and sure enough it's the first spring.
I changed broken valve springs on gas engines
where I put air in the cylinder through the
sparkplug hole. But how do you do it on a
diesel engine to hold the valve in place? I
could pull the injector as a last resort. Is
there an easier way?
 
Putting that cylinder piston at TDC not sure how much room there is for the valve to move anywhere.
Maybe someone will chime in that has one apart to check .
 
I thought of that. I was wondering how much room between head and piston? I should be able to compress the spring enough to get the keepers in if the piston is at tdc. I thought if the piston drops down if I have a dowl and a drop of jb weld I could pull the valve up. Just trying to think outside the box.
 

Could be time to pull the head and perform an inspection of head and block .
If one valve spring has failed at that age and hours . Odds are the other valve springs are near or at end of life .
 
Second BuickandDeeres post. Dropped valve means time to take a peak at that hole and the rest. Sometimes the valve can smack the piston and do some undesirable things. Ive seen the head of the valve pop off and be laying in the piston crater with some valve shaped stamp marks on the piston. If you pull up on the stem what happens? If you are lucky it stays put doesnt come out of its guide and if your very lucky you could pop a new spring on and away you go. Historically I have not been that lucky. At the very least that valve should be replaced and might be time to look at the others.
 

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