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- My 3 year old gear reduction starter for my 254 Jinma is grinding the teeth off my flywheel.
The starter has occasionally not engaged the flywheel but within the last month it has gotten worse prompting me to pull the starter for inspection.
There is a 1/2” thick “rebound “ bearing on the pinion starter shaft. I am going to cut that off to gain more travel towards the flywheel for engagement.
Any suggestions?
- My 3 year old gear reduction starter for my 254 Jinma is grinding the teeth off my flywheel.
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Here is how I would go about it.
First, measure from the face of the mounting flange on the bell housing to the back side of the flywheel.
Then, manually turn the starter drive to extend it as far as it will go. Measure the distance from the starter mounting flange to the forward most edge of the pinion gear.
Compare the two measurements to determine if the fully extended gear will completely engage the ring gear.
If it does not reach far enough, it is probably the wrong started for that engine.
If it DOES extend far enough, then you need to test the starter under load to see if the pinion gear is fully extending on its own. It is quite normal for these things to get dry and not extend all the way.
I haven’t had a gear drive starter apart so I don’t know what mechanism drives the pinion gear. On the non-gear starters, that is driven by the starter solenoid via a fork on the pinion gear. If the solenoid gets weak or if the battery voltage is low the pinion will fail to fully extend and can cause all kinds of issues including wear on the teeth that you are seeing.
I know that when I ordered my reduction gear started, I had to measure the nose length of the old starter in order to get the proper length.
Is this a new starter that doesn’t fit well or has it been working fine and is just now starting to wear?
From the pictures that does not look too unusual, as there often is a little chamfer on the leading edge of the teeth to make engagement easier.
Hope this helps
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<p style=”text-align: center;”>Thanks for the response;</p>
The picture does not show it but there is fresh wear on those flywheel teeth. The metal cushion/rebound bearing that the starter pinion slams into on that QDJ1331A starter is .296” thick. I compared that dimension with an old style starter core and its rebound bearing measured .225”.A difference of .71 inches. All else being equal means that newer style gear reduction starter is not engaging the flywheel teeth by .71 inches less than the old style starters. The worn teeth confirm this.
I eliminated the rebound bearing on the gear reduction starter and replaced it with a leather cushion between to steel washers. Sorry I failed to measure the thickness. I replaced the modified starter.
The tractor started but I am not convinced the problem is improved. I will keep you posted.
Ps,I cut that rebound bearing off. I found out it is held on the pinion shaft by a retaining hog ring?. I could have probably used a socket to tap it off the retaining ring and then pried the retaining ring off and remove the rebound bearing from the pinion shaft. Live and learn.
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