D1005 Flywheel Ring Gear Question

[petenpole]

I did an engine swap this past spring on my B2100.

The replacement engine has become harder and harder for the starter to engage. So before my vacation I pulled the starter and went through it and it appears to be in good condition. I did look inside the bell housing at the flywheel & ring gear. To my surprise the gear is almost non existant. The teeth are virtually chewed completely off (85% gone)

I have the original flywheel and ring gear from the engine that was removed to swap over.

But before I do that I am curious, was there multiple ring gears available to the 1005 and is that maybe the reason for the gear to be all chewed up? Or is there something more I need to be looking at before I pull the engine for a 2nd time?

I know i should have counted the teeth before I bolted the engine in, but I was in a hurry and maybe even lazy.

I will accept any advice offered. Thanks in advance.

 

[Pau7220]

There is actually a serial number break. I don’t know what the difference is, but it can be flipped and re-used if not completely destroyed (and if it’s the correct set up).

 

[GreensvilleJay]

hmm, are ALL of the teeth virtually gone ?
If so,I suspect the starter was 'on' while the engine was running for a long time ??

I know 4 stroke gas engine always stop at 1 of 2 places,so only a few teeth can get chewed....

check # of teeth on both ring gear AND starter (should be listed...)

 

[Daferris]

Also check the "throw" of the starter... Does the pinion fully engage the ring gear or is the ring gear too far away from the starter?

 

[petenpole]

I have pulled the engine and changed the flywheel. I did a complete flywheel change as the used flywheel i installed had a good ring gear. Before I bolted the engine back into the tractor I installed (with temp bolts) a different starter to make sure I had good engagement and that the teeth of the starter had a good mesh with the flywheel.

I also counted the teeth on the damaged flywheel and replacement flywheel and they were the same 106 teeth. Both starters had the same # of teeth.

My best guess is the original starter was the culprit. Maybe its bendix was not fully engaging. I would have thought the starter gear would have been the sacrificial material as opposed to the ring gear itself.

i am attaching the gruesome photos for all to see and I welcome any observations others may have

Thanks