Replacement starter

[brahman265]

Hello, I ordered a new gear reduction starter for my Ford 5900 and it has 10 teeth instead of the 9 teeth on the old starter. Does anyone know if this would be a problem? It is the newer gear reduction starter versus the OEM starter. Thanks for any help.

 

[Midniteoyl]

I take it the new starter gear is a little bigger? As long as they match up with the flywheel teeth, I see no problem... Maybe someone else will chime in.

This the one you have? Amazon.com: NEW GEAR REDUCTION STARTER FITS FORD FARM TRACTOR 5 51 52 534 56 561 59: Automotive

Or this one? Ford 5900 Starter, DIESEL engines - D8NN11000CE

They both have 10 teeth and say they'll work.

 

[brahman265]

Yes that first one is what I have. Hopefully someone else has ran into this before and can confirm the 10 teeth can replace the original 9 teeth. Thanks.

 

[Steave]

As long as the teeth are the same size it won't matter as Midniteoyl said the gear is just bigger. That's a hefty price for a starter when you can get a new starter for $135. Several online sites have them for simular prices. Is there a reason you need the gear reduction starter. Just wondering if I need to start thinking of a little more ump for my old ford. So far so good and it's 50 years old.

 

[jimmysisson]

If the gear is bigger won't it mesh too tight w the ring gear? I'm confused. Or is the od the same, in which case the teeth would be a little small. ?
Jim

 

[flyerdan]

If the gear pitch is the same, it doesn't matter how many teeth are involved. Going to a larger diameter starter gear would require more teeth for the same pitch, and would increase the gear ratio. Since it's a reduction drive starter, the ring gear ratio increase would be offset by the internal reduction.

 

[sd455dan]

If the gear pitch is the same, it doesn't matter how many teeth are involved. Going to a larger diameter starter gear would require more teeth for the same pitch, and would increase the gear ratio. Since it's a reduction drive starter, the ring gear ratio increase would be offset by the internal reduction.

I think Jimmy is asking if the starters mounting position is (adjusted) on the pm gear reduction starter to maintain bendix gear teeth to ring gear clearance during engagement.

It would seem that with more teeth- the diameter would be larger on the drive pinion (assuming identical tooth profile) and therefor this would need to be taken into account to maintain some mesh clearance

 

[jimmysisson]

What he said. Center-to-center of the two gears would have to change if one gets bigger.
Jim

 

[Steave]

Hello, I ordered a new gear reduction starter for my Ford 5900 and it has 10 teeth instead of the 9 teeth on the old starter. Does anyone know if this would be a problem? It is the newer gear reduction starter versus the OEM starter. Thanks for any help.

I think the starter you took off is the oddball if it has 9 teeth. Ford 5900 came with a 10 tooth starter and the replacements also have 10 teeth. Not sure what kind the 9 tooth is. Hope the one you bought works for you. My brother bought a gear reduction for a Belarus and wow it's a lot stronger. His engine has a compression release for starting but the new starter will spin it without releasing the compression. That thing seems to have enough power to spin the ring gear off.

 

[Steave]

Well I stand corrected. Was talking to a tractor mechanic today and happened to mention the 9 tooth starter and he said he's send them on some fords. I remember ford used 4 1/2" and 5" starters and maybe on the same model tractor. I haven't run across the 9 toother yet and probably won't as I don't work on tractors much anymore. Mostly just old plows now (Hobby) by the way.

 

[mitch becton]

this should not be a problem we do alot of old stuff where the customer wants more power the gear reducted even greatly small in size will almost always double cranking power also there is a matter of slap as its called or play between the starter gear and the flywheel that allows for a smoother crank you can '+' or minus this a small amount with no problem also keep in mind going from 9 tooth to 10 tooth or 8 tooth if all works this is only going to change the speed in which the starter gear teeth turn flwheel and cranks over

 

[brahman265]

Well I installed the ten tooth starter and it seems to work fine. Doesn't seem like I have much choice as all new starters seem to be ten. Anyways thanks for all the help.

 

[mitch becton]

i have sold hundreds of starters over last 25 years it is amazing what the japanese have done in figuring this out it is really a science in measurement good luck