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- #21
Fast shipping ordered kit on 2/12 rec 2/14 nice!
2F carb part#
- Thread starter 79fj40moneypit
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My carb doesn't even have those o-rings and it runs fine 
- Thread starter
- #23
My carb doesn't even have those o-rings and it runs fine
What??? Then what do the o rings seal??
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They seal the top of the air emulsion tube.
Having them in place is a Good Thing (tm).
Having them in place is a Good Thing (tm).
Old Thread - New Life
I recently solved a performance issue that ended up being in the carb. I wanted to share my discovery, but thought I'd search the archives before I did so. I found this thread, and thought I could add to it based on what I found.
The vehicle is a 1984 FJ60, USA market. The problem was inadequate full-throttle performance. The vehicle acted as if it was not getting enough fuel, but only when needing power at speed (hills, passing). While cruising at constant speed, and under mild acceleration, performance was good.
I ended up focusing on the carb after taking care of just about everything else. I had just installed another engine in the vehicle, and in the process of cleaning up the donor engine I replaced every seal and gasket, except the head gasket. So I was pretty certain I was not dealing with a vacuum/manifold leak, valves out of adjustment, or any of the other problems these engines suffer after years of service.
So into the carb I went. I removed the top from a loose carb to have a look, and after putting it back together I noticed one, little, dried out ring that I couldn't find a spot for. Hmmm . . . .
I have since looked at several 2F carbs and found them all to be missing these rubber sealing rings. You can see them, or where they are supposed to be, by looking down the top of the carb.
Follow the parting line between the bottom and top and you'll see the spot for these rings at the end of the "Small Venturi", the end where the mounting screws are located, where a seat for the seal was machined around a raised orifice. That seat corresponds to a sealing surface machined into the top of the carb, one for each venturi.
The part number is the very same mentioned earlier this thread:
21659 38110
I made some from pieces cut out of vacuum hose to fit, and installed them in the carb on my truck. From the moment I first fired up the engine I could sense a difference in how the carb was working. And now the power is there when I push the pedal down. The vehicle responds to the pedal as it should.
The before/after difference was amazing to me, so I thought I'd share the info.
Cheers!
I recently solved a performance issue that ended up being in the carb. I wanted to share my discovery, but thought I'd search the archives before I did so. I found this thread, and thought I could add to it based on what I found.
The vehicle is a 1984 FJ60, USA market. The problem was inadequate full-throttle performance. The vehicle acted as if it was not getting enough fuel, but only when needing power at speed (hills, passing). While cruising at constant speed, and under mild acceleration, performance was good.
I ended up focusing on the carb after taking care of just about everything else. I had just installed another engine in the vehicle, and in the process of cleaning up the donor engine I replaced every seal and gasket, except the head gasket. So I was pretty certain I was not dealing with a vacuum/manifold leak, valves out of adjustment, or any of the other problems these engines suffer after years of service.
So into the carb I went. I removed the top from a loose carb to have a look, and after putting it back together I noticed one, little, dried out ring that I couldn't find a spot for. Hmmm . . . .
I have since looked at several 2F carbs and found them all to be missing these rubber sealing rings. You can see them, or where they are supposed to be, by looking down the top of the carb.
Follow the parting line between the bottom and top and you'll see the spot for these rings at the end of the "Small Venturi", the end where the mounting screws are located, where a seat for the seal was machined around a raised orifice. That seat corresponds to a sealing surface machined into the top of the carb, one for each venturi.
The part number is the very same mentioned earlier this thread:
21659 38110
I made some from pieces cut out of vacuum hose to fit, and installed them in the carb on my truck. From the moment I first fired up the engine I could sense a difference in how the carb was working. And now the power is there when I push the pedal down. The vehicle responds to the pedal as it should.
The before/after difference was amazing to me, so I thought I'd share the info.
Cheers!
i believe this is the spot. mine does not have them, nor did the rebuild kit have them. Guess i should run by napa and see what they got
This is such an old thread so sorry for resurrecting….
Does anyone know where I can find these O-rings? I lost one and have made a replacement out of a cross section of vacuum hose (thanks for the idea gmog!). It seems to work OK but I feel like I notice it. Even it’s its mental I’d love to find them!
Does anyone know where I can find these O-rings? I lost one and have made a replacement out of a cross section of vacuum hose (thanks for the idea gmog!). It seems to work OK but I feel like I notice it. Even it’s its mental I’d love to find them!
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