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SC CASE No Power Update

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Anonymous-0

Well-known Member
All I can assume is my SC CASE is performing properly, though it still seems lazy to me. Compression is 115-120 on all cylinders. Tractor starts & runs very well. Tractor will take off in high gear in level stubble field. Timing IS correct, as I tried moving rotor forward & backward one tooth and it ran very poorly.

All that said, it still seems lazy/unresponsive to me, but maybe I am expecting too much.

Thank you to each of you who responded to my earlier thread.


Glenn F.
 
I'm probably the one missing something here, but there's more to setting timing than "moving rotor forward & backward one tooth".

I ASSUME we are dealing with a mag?

If so, you are simply having the rotor at a correct location, next to one of the high-tension terminals when the points "break" and the mag "fires". (INTERNAL mag timing.)

The engine spark timing is set by loosening the bolts that hold the mag to the engine and rotating it slightly so spark occurs at the manufacturer's specified timing, typically TDC.

Do you have the correct timing "spec", and have you verified that the mag "fires" at that point?

At startup, once the engine achieves a speed of a few hundred RPM'S, the impulse "drops out" and "lag angle" is eliminated, and the spark instantly advances to full running timing.

The "lag angle" is determined by interchangeable parts in the impulse.

COULD be some wrong, or simply WORN parts there, leading to incorrect "running timing".
 
I rotated thr mag both ways (retard & advance) before moving the rotor a tooth. Tractor ran significantly worse.

I could be wrong, but. I don't thnk there's anything wrong internally as I had thr mag completely tuned up before parking tractor seven years ago, (less than five hours on mag).

Glenn F.
 
Slight decrease when moving mag retard/advance. Much worse when advancing/retarding rotor a tooth.


Glenn F.
 
I have read several of these SC posts. Check the valve train and rockers camshaft lift also. Also a bad bearing scorn rotor and fields in the mag can cause this. If distributor stuck weights in it. Olers have touched on the governor. I will add a cam/gear related timing issue.
 
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