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Removing mixer on IH M 1 1/2 Question


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  #1  
Old 07-20-2007, 01:05:20 PM
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Default Removing mixer on IH M 1 1/2 Question

I want to remove the mixer on 1 1/2 M. (Igniter w/ 3 needle valves).
After removing nuts on top and the upper piece I believe there are two stud running thru the body into the lower piece. There appears to be a gasket on the bottom of the mixer body , but can't seem to break the contact, and don't want to pry too hard. Can someone tell me if these are "thru studs" and should I be able to just pull the main body off? Do the studs need to be pulled first? Thanks!

Big Jim

Last edited by JimS; 07-20-2007 at 03:03:09 PM.
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Old 07-20-2007, 01:40:14 PM
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Default Re: Removing mixer on IH M 1 1/2 Question

The studs are screwed into the cyl. head. The whole carb just slides off of the studs. You do not have to remove them.
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Old 07-20-2007, 04:19:40 PM
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Default Re: Removing mixer on IH M 1 1/2 Question

The whole mixer does just slide up off the studs and there is plenty of clearance to work with the usual rust and dirt in the holes. Tap from the bottom of the mixer. However, once off, the lid might not want to come off. Between the lid and the body of the mixer is a pot metal venturi. You will almost certainly break it in two. Most of mine are broken, but when you fit the lid back on, the broken halves come together and still work. I think Starbolt or someone has reproduction aluminum ones too.
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Old 07-20-2007, 04:29:19 PM
Tom Martin Tom Martin is offline
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Default Re: Removing mixer on IH M 1 1/2 Question

Starbolt has metal venturi sleeves, but the one I got recently from Hit'nMiss was made of plastic. I prefer the metal ones. I suspect that your engine has had the mixer changed at some time in the past. My igniter fired 3 HP M has a one piece cast iron mixer with two needle valves, and my two 1 1/2 HP's have two piece mixers with one needle valve. One of the engines is an early spark plug engine with a Bosch magneto and the other is a later one with a WICO EK mag. Maybe the 1 1/2 HP M's did have a three needle mixer at one time.
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Old 07-21-2007, 12:34:36 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Removing mixer on IH M 1 1/2 Question

The 3 needle carb was the latest version. it allowed the gas needle to be set independe,tly from the kerosene one, making the switch from gas to kero smoother, and less prone to loading up.
Andrew
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Old 07-22-2007, 11:15:08 AM
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Default Re: Removing mixer on IH M 1 1/2 Question

Thanks all. Had to force it a bit with a small chisel, but worked around the whole bottom and it finally split. Appreciate the info. Big Jim.
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Old 07-22-2007, 06:17:00 PM
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Default Re: Removing mixer on IH M 1 1/2 Question

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Originally Posted by JimS View Post
Thanks all. Had to force it a bit with a small chisel, but worked around the whole bottom and it finally split. Appreciate the info. Big Jim.
Jim, On the three needle valve mixer/carb, the 3rd one is used to insert water when running the engine on kerosene
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