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Hit & Miss Gas Engine Discussion

IHC M Fuel Pump


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  #1  
Old 10-11-2007, 08:38:35 PM
lister d lister d is offline
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Default IHC M Fuel Pump

Hi, I have just taken off the fuel pump on my 1919 IHC M 1 1/2 HP.
It is complete but very dirty. Is there anyhing I should look out for? Hints and tips please. Has anybody got a parts diagram for the pump?

Thank you, Stephen
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  #2  
Old 10-12-2007, 07:36:37 AM
Tom Martin Tom Martin is offline
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Default Re: IHC M Fuel Pump

I think yours will be a cast iron pump, if original, and they are pretty simple. There are two check balls in the pump- a 1/4" one in the bottom of the barrel and one in the outlet. Yours will probably have the outlet ball in a special brass fitting screwed into the upper hole in the side of the pump. I don't recall the size of the outlet ball but its either 5/16" or 3/8". The later style of pump has the outlet check ball in the pump body under the angled fitting. Check ball seats should be lapped for a good seal. The pump plunger should not be appreciably worn or the pump will leak around the packing. The body of the pump has an enlarged tapered section in the top of the bore for packing, and a sleeve that is tapered on the bottom to compress the packing, with a seat on the top for a spring that goes around the plunger to put pressure on the packing. Some people advocate using soaped mop strings for packing, but I prefer to use the graphited material that is designed for packing, and I have had no leakage problems yet. When oiling the engine I put a shot of oil on the plunger at the top of the pump to help prevent wear of the packing.
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Old 09-11-2011, 06:13:18 PM
mjw9mm mjw9mm is offline
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Default Re: IHC M Fuel Pump

Tom,i have a 1922-24 imc 3hp. The fuel pump is white metal with the outlet to the mixer at a 45 degree angle. The plunger came out fine but i can't tell if there is a removeable bushing below it. It seams like it is cast in.I did get the packing out from behind it. Any ideas on how to get it out,its been soaking in kerosean for four days. MJW
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Old 09-11-2011, 07:33:48 PM
Tom Gosciminski Tom Gosciminski is offline
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Default Re: IHC M Fuel Pump

There is no bushing in the pump, ( it only has the piston, the spring, the packing gland, the packing, and the 2 check balls )
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Old 09-11-2011, 09:29:09 PM
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Tom Marshall Jr. Tom Marshall Jr. is offline
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Default Re: IHC M Fuel Pump

he may mean the ring that pushes against the packing is still stuck in at the top of the pump .tom
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Old 09-11-2011, 10:14:33 PM
Tom Gosciminski Tom Gosciminski is offline
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Default Re: IHC M Fuel Pump

The ring that pushes against the packing is the packing gland. Tom
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Old 09-12-2011, 01:24:20 PM
mjw9mm mjw9mm is offline
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Default Re: IHC M Fuel Pump

Tom , what's the best way to get the cup,or gland out? MJW
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Old 09-12-2011, 01:31:18 PM
Tom Gosciminski Tom Gosciminski is offline
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Default Re: IHC M Fuel Pump

Most of the time the ring breaks when trying to remove it, ( it is only made of pot metal ) I just turn out a new one on the lathe.
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Old 09-12-2011, 07:05:16 PM
mikesautosvc mikesautosvc is offline
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Default Re: IHC M Fuel Pump

Ive been trying to get an M pump goin myself and ordered another from hit and miss when I saw your post about the smaller check ball in the pump ,that got it goin ,now I'll have a pump for my older M
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