acmoc

ACMOC Membership Benefits

  • FREE quarterly magazine filled with content about antique Caterpillar machines
  • FREE classified listings
  • ACMOC store discounts and specials
  • Full Bulletin Board Access
    • Marketplace (For Sale/Wanted)
    • Technical Library
    • Post attachments

$44 /year ELECTRONIC

$60 /year USA

$77 /year International

D4600/D318 swap in 9K CAT 12

More
3 years 6 months ago #222468 by Old Magnet
I don't believe the idle jet should be tapered end for those early carbs. May be why the tip breaks off.
Here's the operating description......
Attachments:
The following user(s) said Thank You: old-iron-habit, Djmayer, Fat Dan

Please Log in or Create an account to join the conversation.

More
3 years 6 months ago #222469 by edb
Replied by edb on topic D4600/D318 swap in 9K CAT 12
Hi,
idle jet looks OK for square end style--be aware there are a couple of small cross drillings back on the tube towards the screw--scans below show fuel flow paths.
My experience with the idle jet is, if it is stuck in the fuel bowl drilling then it will be broken whether it is unscrewed or left in--usually sticks due to moisture attacking the pot metal and causing corrosion at the sliding surfaces :-(

I usually apply a light tap with a small hammer to the face of the jet screw head to loosen the grip of the fiber sealing washer--this can have the effect of loosening the tube in the bowl in preparation to being very gentle and testing the screw for springiness as you try unscrewing it and can can tell you if the jet is stuck or not--heating the bowl can help release it too. I guess it is down to a lot of luck as to whether the jet is stuck or not and comes out.
Just applied this method to remove the jet in the one I tried to photograph below.

Hope this helps.

Hope you dodge the big cloud--what ever it may be.
Cheers,
Eddie B.
Attachments:
The following user(s) said Thank You: Djmayer, Fat Dan

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago - 3 years 5 months ago #222640 by Djmayer
OT: I’m Back with much thanks to almost 2000 responders and over 41 dozers.

And back to our regularly scheduled discussion: Thanks for the diagrams guys They really helped me follow where the fuel was supposed to go. After drilling out the plug above the idle tube I found the passage from the idle tube to the lower cross passage was also completely plugged.

The wire in the image is through the plugged passage.



Thanks for you help
Dave
Attachments:
Last edit: 3 years 5 months ago by Djmayer. Reason: Adding an image.

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago - 3 years 5 months ago #222684 by Djmayer
Wow
Amazing how much better it runs with a working idle circuit and properly set float level.
Pony runs great and made it possible to determine the fuel pressure spring on the transfer pump is broken. I’m not sure but it appears to be part #6B3437. Can anyone confirm that and or recommend a supplier?
Dave.
Last edit: 3 years 5 months ago by Djmayer. Reason: Correction
The following user(s) said Thank You: edb, Fat Dan

Please Log in or Create an account to join the conversation.

More
3 years 1 day ago #227002 by Fat Dan
WOW! that 9k is so nice
just looked at a 1938ish 9K and a 1954ish 8T but can't get close enough to look for S/N numbers

ACMOC Member
955E 12A08263; 955C 12A04040; 955C 12A03563.
1954 No.12 Diesel Motor Grader 8T14777.
1945 No.12 Diesel Motor Grader 9K9320
1944-46 Adams Model No. 311 Motor Grader
1943 IH T9 Bullgrader

Please Log in or Create an account to join the conversation.

Time to create page: 0.156 seconds
Go to top