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Carburetors, Mixers, Fuel Pumps and fuel delivery Discussion about misc. carbs, mixers, fuel pumps, injectors.

Carburetors, Mixers, Fuel Pumps and fuel delivery

1 3/4 Monarch


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  #1  
Old 11-08-2015, 01:02:50 PM
Sawmill7 Sawmill7 is offline
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Default 1 3/4 Monarch

Can someone tell me or show a pic of how the exhaust rod is held in the rear position on a 1 3/4 Monarch gas engine. It has a rectangle push rod for exhaust rod but now where I can see to hook a spring unless mine is missing. Thanks for any help
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Old 11-08-2015, 02:19:10 PM
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Bob Naske Bob Naske is offline
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Default Re: 1 3/4 Monarch

That is probably a Nelson Bros built engine in which case it would have a large diameter spring outside of the exhaust valve spring that stayed in contact with the "paddle " style exhaust rocker arm thereby pushing the exhaust pushrod back.
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Old 11-08-2015, 08:22:31 PM
Sawmill7 Sawmill7 is offline
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Default Re: 1 3/4 Monarch

Thanks for the reply. It does have the paddle style exhaust arm.
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Old 11-12-2015, 02:58:00 PM
Odin Odin is offline
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Default Re: 1 3/4 Monarch

Most of the nelson built engines I've encountered including my own T 1 3/4 jumbo have a rectangular pushrod with a rounded end that passes through a ring in the top of the mixer/carburetor.

The return spring goes between that ring and the shoulder in the rod where it goes from rectangular to round.

Take care when selecting a spring to put here that the engine never ever bottoms it out- if you can't see gaps between the coils of the spring, its too long. On my engine the ring on the mixer was broken off by too long of a spring, I had to braze it back on. Today the engine runs with a stack of shims on the rod to adjust the return force, that way I don't risk breaking it again.
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