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Farmall H carb. still leaks

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John in CT

12-20-2005 18:29:17

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My carb. on my Farmall H still leaks from the metering nozzle clamp nut. I put the origional needle valve cage (screw driver to install) and steel tipped needle back in. I lapped the needle in with valve grinding compound. It seems to be sealing ok. I figure my leak could be comming from 2 places, the washer at the metering nozzle clamp nut or the needle valve cage washer. Those 2 washers are the same IH washer. Did anyone ever have a problem with those washers? Can I replace them with a copper ones? Is there something I could put on the washers to stop the leaks? Thanks!!

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riverbend

12-21-2005 15:47:26

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Re: Farmall H carb. still leaks in reply to John in CT, 12-20-2005 18:29:17

You can't use a copper washer. The metering nozzle will break before it seals. The fibre washers should be plenty for sealing the nut (it works for most of the rest of us...). I think that the fibre washers are more forgiving than even an annealed copper washer.

Do you have a small washer under the hex on the nozzle ? Did this carb leak at the nut before you rebuilt it ? When you rebuilt the carb, did you replace the metering nozzle ? If you still have the old one, clean it up and put it back in. Tighten it until it stops leaking or it breaks.

What happens if you try two washers under the nut ?

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John in Ct

12-21-2005 18:30:25

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Re: Farmall H carb. still leaks in reply to riverbend, 12-21-2005 15:47:26

Thanks for replying. My origional carb ( which didn't run well) was also leaking at the metering nozzel clamp nut. I tightened it up and broke it. I decided to buy a "rebuilt" carb. to solve all of my problems (came with a cracked float, sand in it, too long of a plug that was cutting off all fuel at low idle, etc.). My old carb would never run below 550 rpm's. Was told on this site to replace the throttle shaft bushing. I decided to redo my "rebuilt" carb. New throttle shaft bushing ( reamed to size), nos throttle plate, new choke shaft, IH kit. It runs great( can get it down to 450 rpms) except leaks at the metering nozzle clamp nut.I tightened the nut pretty tight but don't want to break the metering nozzle. I will try 2 washers. It is possible I have a cracked bowl but what are the odds of 2 cracked bowls? Heehee. With my luck probably very high.

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RustyFarmall

12-21-2005 05:54:05

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Re: Farmall H carb. still leaks in reply to John in CT, 12-20-2005 18:29:17

John, the leak you are experiencing has absolutely nothing to do with the needle valve and cage. The bottom end of the metering nozzle is immersed in the gasoline that is in the fuel bowl. It has to be that way in order for the carburetor to function. The only way the nozzle would not be immersed in fuel is IF THERE WAS NO FUEL IN THE BOWL, and of course then the tractor could not run. Is it possible that the leak is actually coming from the load adjustment screw? Did you replace the packing gland for the load screw? The ONLY other way that a leak could be coming from the clamp nut is if the fuel bowl is cracked in that area, in which case you need to find another fuel bowl.

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John in CT

12-21-2005 18:57:31

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Re: Farmall H carb. still leaks in reply to RustyFarmall, 12-21-2005 05:54:05

Also, Is there any big difference between an all fuel and gas metering nozzle?

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John in Ct

12-21-2005 18:41:25

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Re: Farmall H carb. still leaks in reply to RustyFarmall, 12-21-2005 05:54:05

Thanks for replying. See my last post above for some more background info. The cracked bowl seems very possible but to have it on 2 different carbs w/ different metering nozzles seems odd but at the same time, what are the odds of having too long a screw/plug in the top half to cut off all fuel for idle. At this point, I am not ruling anything out . I want to check both bowls for cracks. How can I check them? Thanks!!!

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riverbend

12-21-2005 19:47:36

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Re: Farmall H carb. still leaks in reply to John in Ct, 12-21-2005 18:41:25

Good question. I have an all fuel carb also, and there are two different kits for H carbs. I get the one for the 45108 DD carb and have not had anymore than self inflicted problems. The parts book does show three metering nozzles (one for gas carbs 50981 D and DA only). Everyone has to be running gas these days, so I'm not sure why they bother.

Which screw/plug in the top half do you mean ? It looks like there were two idle passage plugs (24693 D and 352444 R1), but they were used in both carbs.

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John in CT

12-22-2005 08:27:16

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Re: Farmall H carb. still leaks in reply to riverbend, 12-21-2005 19:47:36

24693D idle outlet plug. It is an easy check to see if yours is too long. Does it idle ok 450 rpm's? If no, take carb apart. Take idle outlet plug out. Flip carb over, hold finger over idle outlet plug hole and spray carb cleaner through the little hole on the bottom of the top half of the carb. It should come out in the slit near the butterfly. If it does, put plug back in. Spray again and it should come out in the same place. If not, it is too long.

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Slappy

12-21-2005 02:20:01

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Re: Farmall H carb. still leaks in reply to John in CT, 12-20-2005 18:29:17

Put some fuel-resistant thread sealer on the threads and that should stop the leak. Are you sure the needle is seating ok in the cage? Usually lapping with grinding ruins the seal rather than fixing it.

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John in Ct

12-21-2005 05:28:16

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Re: Farmall H carb. still leaks in reply to Slappy, 12-21-2005 02:20:01

I have tried it with new rubber needle/cage combos, tapping the needle (with rubber tip) into the cage lightly etc. It still leaks no matter what I try.

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RustyFarmall

12-21-2005 04:34:50

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Re: Farmall H carb. still leaks in reply to Slappy, 12-21-2005 02:20:01

Slappy, there are no threads on the metering nozzle nut except for the internal threads that the metering nozzle screws into, and you would not want to use teflon tape anywhere inside the carb.

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