We last left off with bolt trouble, while trying to join the Doka transmission and motor. The difficulty was in determining the correct size of bolts to use. Bolts are specified by diameter and the thread pitch (and length and material and grade and head type and... the list goes on). The diameter of our tapped holes for mounting the flywheel looked like they could be either 7/16", M12, or 1/2" (all within 60 thousandths or 1.5 mm of each other). 7/16" had the right thread pitch, but was a rattle fit. 1/2" was just a bit too big. The thread pitch of the 7/16" bolt was the imperial 20 threads per inch, within 1.5% of the metric thread pitch of 1.25 mm per thread. There is an M10 bolt with 1.25 mm pitch, but the fine threaded M12 bolt is 1.5 mm. Nothing seemed to make sense until we found out they make metric bolts in extra fine pitch. Of course they do. Our solution was an M12 bolt with 1.25 mm pitch.
Here is the face of the motor fitted with the hub and adapter plate.
After bolting on the flywheel, the clutch disk is centered using a nice alignment tool. Do not even attempt to replace a clutch disk without an alignment tool. The transmission and motor need to line up at the same time that the transmission input shaft lines up with the splines in the center of the clutch disk. Once the pressure plate is bolted on, the clutch disk will be fixed, and the clutch alignment tool is the best way to ensure that the disk is centered.
Now that the pressure plate is bolted to the flywheel, the alignment tool can be removed - the clutch disk is secured and centered.
After all of that, it really is as simple as bolting two halves together.
No comments:
Post a Comment