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No spark on an Allis-Chalmers B112.


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#1 Jwaldrop OFFLINE  

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Posted March 17, 2016 - 09:14 PM

It turns over but no spark. I watch the points as it's turning over but the "actuator" that should open and close the points doesn't seem to move. Any ideas?

#2 ACmowerguy OFFLINE  

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Posted March 17, 2016 - 09:29 PM

The plunger could be worn or stuck out possibly.


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#3 Tecumseh power OFFLINE  

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Posted March 17, 2016 - 10:15 PM

Slap a magnetron on it

#4 Bolens 1000 OFFLINE  

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Posted March 18, 2016 - 06:23 AM

Sounds like a worn plunger, what model engine?


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#5 boyscout862 OFFLINE  

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Posted March 18, 2016 - 06:53 AM

Welcome to GTT. You can download the B&S engine manual from our Manuals Section(The Repaimans'). It will have a trouble shooting section to help find what the problem is. The points pungers were notorious for leaking  when they get older. There is a specific proceedure for replacing them correctly. The points only close for one brief instance in the revolution of the engine, it may be difficult to spot if it is actually moving. I usually remove the points, and pull on the plunger and then push it in to feel for movement. If it is jammed, I replace it. It is a pia technique involving a self taping screw. Before reinstalling the points, I clean, polish, and align them. Good Luck, Rick 


Edited by boyscout862, March 18, 2016 - 07:05 AM.

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