Hi I have a ford 851 powermaster diesel. just lately the starter wont stay engaged long enough to start engine. it turns then just when its ready the starter disengages. i have replaced the battery, had starter rebuild, replaced soliond, and finally just split tractor and replaced ring gear. but it still does the same thing... help
- Thread starter joe ohio
- Start date
Larry NCKS
Well-known Member
Sounds like the only thing you missed is the one you needed to pay attention to. Replace the starter drive, or as some call it, the bendix.
Larry NCKS
Well-known Member
The only thing that makes this type starter kick out prematurely is the drive or bad teeth on the flywheel, unless the engine pops and runs briefly. If it does you need to find out why. If not, I'd suggest that not all new parts, i.e. your new starter drive, are up to snuff.
Larry NCKS
Well-known Member
The only thing that makes this type starter kick out prematurely is the drive or bad teeth on the flywheel, unless the engine pops and runs briefly. If it does you need to find out why. If not, I'd suggest that not all new parts, i.e. your new starter drive, are up to snuff.
Larry NCKS
Well-known Member
Gees! 3 times?????
This may not apply here, I don't know for sure if the starters are made the same way or not.
We had the same issues with a starter on a NAA. We took it to be rebuilt and the guy says he does not have the equipment to fix it correctly. We had to take the starter to another shop that could machine or shim up the play that had worn into the armature of the starter.
The armature, if that is the correct term, was moving to much backward to keep the drive in the flywheel teeth.
Once this was fixed the starter engaged and worked like it was supposed to.
We had the same issues with a starter on a NAA. We took it to be rebuilt and the guy says he does not have the equipment to fix it correctly. We had to take the starter to another shop that could machine or shim up the play that had worn into the armature of the starter.
The armature, if that is the correct term, was moving to much backward to keep the drive in the flywheel teeth.
Once this was fixed the starter engaged and worked like it was supposed to.
showcrop
Well-known Member
It sounds to me like the "just when it's ready" part may mean that it fires on one cylinder, which will unload the starter drive just long enough for it to retract. I would say you need to be looking at your fuel and spark rather than the starter. I have experienced this myself more than once.
showcrop:
its a diesel no spark right? do i need to check injectors, unscrew each one and see if they are wet? It's my first diesel, hard to trouble shoot. could the injector pump be bad? i can start it with a squirt of starting fluid, and then it runs fine. no smoke it runs for hrs brushhoging pastures. just cant get it to start.
any input will be greatly appreciated.
joe
its a diesel no spark right? do i need to check injectors, unscrew each one and see if they are wet? It's my first diesel, hard to trouble shoot. could the injector pump be bad? i can start it with a squirt of starting fluid, and then it runs fine. no smoke it runs for hrs brushhoging pastures. just cant get it to start.
any input will be greatly appreciated.
joe
showcrop
Well-known Member
Sorry I missed that it was diesel. I have an 871 Diesel. It has not done what you are describing but it can be hard to start at times. Is the new battery full sized? The battery has to have enough CCA to turn the engine over fairly rapidly. If it is not cranking fast enough it can crank for ten minutes and not start. Does temp make a difference? Mine usually starts better cold than hot, because the pump is in need of repair and won't develop adequate pressure when hot to make injectors pop off. Are you getting white smoke? the smoke indicates fuel getting to cylinders. Does the preheat work? mine needs about 20 seconds even if it is 80 degrees out. Has it run since you replaced the filter? It can take a half hour of cranking after the filter is full to get fuel to the injectors if the pump has been run dry.Post back.
Larry NCKS
Well-known Member
showcrop: I think he needs to figure out his original issue first, which is starter disengagement. Unless he's cranking excessively before that happens, he's got cranking issues, not fueling issues.
Sean in PA
Well-known Member
I think the idea that one cylinder is firing enough to kick out the starter drive might have some credence when coupled with the question about the battery. If one cylinder has better compression than the rest, and the battery is slightly underpowered, then the one cylinder might try to fire at a lower rpm than the other cylinders and kick the starter drive out.
showcrop
new update went to tractor supply and bought a new battery, the biggest one that would fit 975 cca. bought new battery cables too. new fuel filter. charged battery for a whole day. cranked for 10 minutes, still disengaging "just when ready to fire". got furstated and used a squirt of ether, she fired right up with a little white smoke at first. then she ran rough. fuel problem right? how to i trouble shoot the problem. where to start? by the way i did bleed the fuel system after i replaced the filter. this is the first time she ran rough also, but i agree she must be firing one cylinder and shooting the starter out.
new update went to tractor supply and bought a new battery, the biggest one that would fit 975 cca. bought new battery cables too. new fuel filter. charged battery for a whole day. cranked for 10 minutes, still disengaging "just when ready to fire". got furstated and used a squirt of ether, she fired right up with a little white smoke at first. then she ran rough. fuel problem right? how to i trouble shoot the problem. where to start? by the way i did bleed the fuel system after i replaced the filter. this is the first time she ran rough also, but i agree she must be firing one cylinder and shooting the starter out.
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