tm9-801.com

I read this as I surfed the net in search of CCKW info:

Re: CCKW REALITY CHECK

Postby R****R » Mon Jun 22, 2009 12:47 am
Many of the CCKWs, no matter when delivered were found with Die Cast Carburetors installed as their years in the Army rolled by. All that is necessary for switching carburetor styles is to use a matching air cleaner for the type.
During the 60s Zenith manufactured a Die Cast Adaptor with square flange that clamps to the CCKW Die Cast Carburetor and allowed use of the late style air cleaner associated with the Cast Iron Carburetor. Many of the European returns are thus set up.

The Die Cast Carburetor is the way to go and NOS are available in limited quantities.

ACTUALLY the die cast carb adapter for late model air cleaners was available in 1944. There is a GM SB that clearly shows it and also gives the PNs.

The die cast carb and top heavy air cleaner were very prone to falling off and even when the mod to add the block to air cleaner support was added it was known that even this was a poor patch. The new support not only fully supported the carb, but the new air cleaner bolted to it.

Please reference GMC Bulletin G-98 for the pictures.. I'll post them when I get them scanned in.

Zenith model 28AV11 PN 9778 are not hard to find. NOS is fake term.... used to try and separate people from their money.

I would also like to know how CCKWs were equipped with superseded parts. Why were trucks in 1945 still not using Series I hydrovacs? Because they were superseded by the Series II and III.

As promised, the G-98 GMC SB from June 1944 detailing the die cast bracket.



All of the TMs I reference are readily available. Is no one reading them except me???

I doubt that there is any satisfactory way to affix any air cleaner to a die cast carb. The only surface on the carb available for mounting was the upper air horn. You get about 3/4th an inch of metal. The factory friction method (by using a hose clamp) was weak and fell off on rough terrain.

If you examine the GMC kit you'll see that the bracket bolts to the engine block and slips over the air horn on the carb... that's a three point hold down and about as good as you will get. The die cast carbs simply would not have and strength to accept a mounting stud or allow for anything to be directly attached to the carb. The cast iron, on the other hand would be almost compatible to steel in strength.. thats why the molded a flange for bolts on it... its much thinker and much stronger.