Re: Super M Ignition: Won't run same way twice?

Posted by Bob M on October 23, 2006 at 09:47:08 from (151.190.254.108):

In Reply to: Super M Ignition: Won't run same way twice? posted by Dennis Gauge on October 23, 2006 at 09:15:40:

Dennis – You might be on the right track thinking it might be a cam/valve timing issue!

Depending on how it is used the live pump on the Super M puts a very heavy load on the cam drive gear. Cam gear retaining nuts can loosen, or even unscrew completely and fall off. This causes either woodruff key in the gear hub to shear or the gear hub to break. After this happens the tractor may still run, but will run erratically and poorly. Also it may run differently upon each startup since the crank rocking backward each time it stops repositions the cam drive gear relative to the camshaft and hence changes the valve/ignition timing.

The fact the engine won’t start now indicates the camshaft is too far out of time for the engine to run at all.

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A couple things to try:

1 - Remove the rocker box. Turn the crank by hand until the TDC (single notch) timing mark on the crank pulley is aligned with the pointer. Now check the valves on #1 and #4 cylinders. Both push rods on one of the cylinders should be free - doesn’t matter which cylinder - indicating the valves are closed. If not it means the camshaft is out of time.

2 - Mark the position of the distributor rotor then pull the distributor/live pump assembly from the engine. The cam drive gear is visible just inside timing cover. Use your finger or a screwdriver on the cam gear and see it can be moved around. If it moves at all it’s either loose on the camshaft or the gear hub has broken.

Replies:

• Re: Super M Ignition: Won't run same way twice? Dennis Gauge 12:40:29 10/23/06 (1)
  • Re: Super M Ignition: Won't run same way twice? Bob M 05:38:28 10/24/06 (0)

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