Need some help in diagnosing the issue with my bendix. It suddenly stopped engaging. Starter motor still spinning. Attached a picture after I opened the cover. Seems the gear has not returned.
Where is the shaft and woodruf key?
Found it like this when I remove the cover.Took another picture which looks more inside the ID with the keyway. Should I take it apart to find out what happened ?
Yes! And before you install the new key, check its fit, both in the starter shaft and the collar slot. If there are any burrs that interfere with the smooth installation of the key, the key will slip out while you're installing the collar and drop inside the transmission. Then the only thing keeping the bendix from spinning on the shaft will be the locking bolt on the collar, and it isn't strong enough to withstand the starter torque for long.
If you find any burrs, carefully file them off so that the key slips fully into the shaft and collar slots.
Been there, done that!
The bendix has slipped off the end of the starter shaft. Remove the bolt at the end of the shaft. Slide the bend off. You need to check the key, the keyway and make sure that the bolt still has the little bump on the end of it for going in the hole that is about 90 degrees to the keyway.
It looks like the numb may worn off the end of the bolt.
Clear as mud?
here are two photos of the Bendix drive parts that will help you understand how the parts go together.
It also appears your car has a Model A Bendix drive spring and the drive head bolt has sheared off. A Model A Bendix drive spring can be installed on a Model T Bendix drive, but it will not work correctly.
Here is a photo of the correct bolts and keepers.
I suggest you get a new Model T Bendix drive spring, the proper bolts/keepers, new starter armature shaft Woodruff key and repairing this should be fairly easy.
Hi Ron. Thanks for anylizing my issue in such detail. Pictures are very helpfull. Any suggestion for the best source to buy the parts ? Are you selling them ?
I know for a fact that Lang's Old Car Parts has all the "correct" Bendix drive parts you need. www.modeltford.com
I do not sell individual parts to the Model T hobby, only fully rebuilt electrical parts.
I have a new bolt with the nub. I just bought both of them from Langs but I needed the other one. I'll mail it to you if you want it.
And the lock washers are very important! I bought extras 'cause I don't like bending them more than twice, I don't remember why I had to remove the cover one time but sure glad I did as one tab had broken off and the bolt was ready to come clear out!
Got one of those too!!