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Cat 12 grader not starting?
Cat 12 grader not starting?
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9 years 5 months ago #120715
by THE MACHINIST
The bowl is filling, the fuel is just not making it into the cylinders.
I will try it without the filter in the vent after I let it soak overnight again.
Thanks
Jamie
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9 years 5 months ago #120717
by THE MACHINIST
Old magnet are you saying that if the bowl is filling (which it is) then it's not my float which is new as well as new needle and seat
Or are you saying its not the vent if the bowl is filling?
Thanks
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9 years 5 months ago #120718
by Old Magnet
I'm saying that neither the float valve nor your "shower head" vent is the problem if the float chamber is filling and shutting off at the correct level.
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9 years 5 months ago #120753
by THE MACHINIST
Any other thoughts or suggestions? Before I put it back together tomorrow? My plan is to blow out everything well and leave the wool out of the vent. Use some aviation gasket sealant on the base gasket to make sure there are no leaks.
Thanks again.
Jamie
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9 years 5 months ago #120757
by Old Magnet
There is a lot more to these carbs than one might think. Here is some general info. If you can pin your problem/s down to a specific system I can provide more info.
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9 years 5 months ago #120761
by THE MACHINIST
After looking at my carb vs. the drawing my load adjusting needle has no point on it just a hole in the end and another on the side about an 1/8th of an inch up. Not sure if it had one and broke or fell off or was designed not to have one. But might make sense why I cant get it to run. After looking further at the drawing and my carb I don't think they are the same model carb. My main jet I Believe comes in at an angle with a plug that you use a 1/2" wrench to remove the plug then a screwdriver to remove the jet from the bottom of the bowl. The plot thickens.........
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9 years 5 months ago #120762
by Old Magnet
I'd have to go look to see what the needle looks like on the early carb but it should look something like the ones on the later versions.
I dug up the parts diagram for the 9Kxxxx grader carb and it shows the internal vent passage that we discussed. The shower head is just an overflow which could be plugged if you wish.
Correction, I actually do have a picture of the main jet for the early carb and it looks like what you describe.
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9 years 5 months ago #120767
by THE MACHINIST
I don't have a pin with a spring on it in my carb like the first picture you uploaded.
Am I missing something or is that from a different model?
The second drawing you just uploaded looks like my carb.
Thank you very much for your time and effort.
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Cat 12 grader not starting?
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