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JD 5105 want start

W

Willy P

Member
I am working on my uncle's JD 5105 and it want start,getting good fuel pressure to the injectors so replaced the injectors and it smokes like it getting fuel to the cylinder but it want start. Tried ether and it want start.Don't see any kind of glow plugs in it. The fuel has been drained and fresh fuel put in with new filter,injection pump was rebuilt over a year ago.Any help would be appreciaed.
 
Sometimes if the engine isn't cranking fast enough they won't start. Try to pull start it and see what happens. Any air at all in the fuel system will keep it from building pressure to pop the injectors.
 
If she is spinning fast enough and you give her a breath of ether and she still won't pop, you have low compression. Stuck Rings or valve adjustment are my first two guesses but that is just what they are .
 
Im not sure a 5105 is the same but a 5305 ran me crazy one day with the same problem you are describing. There is a coolant sensor on the front of the block on the left side of the tractor, this sensor is is wired into the wiring to the injection pump. On the 5305 when the water temp was cold, or for cold weather it changed the timing so the engine would start faster and not diesel knock so hard ( so my injection service place tells me) . Well the sensor was bad on the tractor I was working on and it had the timing retarded so far it would not start. I finally just disconnected the sensor and it fired right up. It was a new one on me for sure. Im still not sure how they get variable timing out of that kind of injection pump anyways.
 
I would go with the advance/retarded timing theory unless there's something else to the story and assuming that there is fuel going to the injectors.
I'm not up on Deere's but fuel systems are fairly generic...

Rod
 
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