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#2
22-03-09, 01:48
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Quote:
Just be carefull as the original replacement bearings were supplied in a ' semi finished ' condition . The idea was they were to be ' line bored ' , as per the manual . I think the original part numbers will be for those semi finished shells. Not many engine shops do the line boring work any more , and it's a very time consuming, therefore, expensive process. The 216 precision shells didn't make an appearance til around 1948 ..they were made to fit the earlier motors pre 48 , as well as the post 48 motors. I've got a booklet here put out by GM , on the precision shells and how to install them with the motor in situ. You still use the shims , per the older type shells, which is interesting . Mike
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1940 cab 11 C8 1940 Morris-Commercial PU 1941 Morris-Commercial CS8 1940 Chev. 15cwt GS Van ( Aust.) 1942-45 Jeep salad 
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#3
22-03-09, 01:59
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Thanks Mike
Have tried three different US suppliers but I dont know what it is with US companies but they seem incapable of answering emails  very frustrating when you are trying to get things happenning I was curious about the original numbers as I have been told of a bloke with quite a few different cmp bearings but he dosent know what they fit or what to look for thought it may be a place to start Might be lucky enough to strike a finished set Would it be possible to get a scan or copy of that manual ? It sounds like a interesting read
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Have a good one  Andrew Custodian of the "Rare and Rusty" 
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#4
22-03-09, 02:43
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216 main bearings
Andrew as Mike stated earlier the original main bearings were supplied for either line boring or hand scraping ( two different pt/numbers )
Here are some pt /no's for std mains . Blitz Parts book ( for hand reaming ) Front main 604003 Front int 604004 Rear int 604006 Rear 604535 Nasco ( precision finish ) F 3847064 FI 3847201 RI 3847606 R 3847068 ( 40/47 ) 3847067 ( 37/39 ) Repco ( sets for domed piston engines ) 1937/39 4M9559 1940 4M9979 It appears that the front 3 mains went right up to 1947 but the back main kept changing hence the different sets. When ordering check the width of the rear main . I have several sets of GMC mains , I will cross reference the numbers to see if they match. Regards Jim S.
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jim sewell cmp and cckw Last edited by jim sewell; 22-03-09 at 02:57.
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#5
22-03-09, 02:48
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Check out this ebay store. They list main bearings for $87.37.They also have overhaul kits fir around $750.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set 1940 Cab 11 C8 cab and chassis 1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun 1940 Cab 11 F15A w/ Chev rear ends 1941 Cab 12 F15A 1942-44 Cab 13 F15A x 5 1942 cab 13 F15A with 2B1 box 1943 cab 13 F15A with 2H1 box 1943 Cab 13 C8A HUP 1944 Cab 13 C15A with 2C1 box 1943 Cletrac M2 High Speed Tractor MkII Bren gun carrier chassis x 2
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#6
22-03-09, 03:02
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Ebay store
Cletrac , let us in on your secret , please.
Jim S.
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jim sewell cmp and cckw
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#7
22-03-09, 03:05
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set 1940 Cab 11 C8 cab and chassis 1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun 1940 Cab 11 F15A w/ Chev rear ends 1941 Cab 12 F15A 1942-44 Cab 13 F15A x 5 1942 cab 13 F15A with 2B1 box 1943 cab 13 F15A with 2H1 box 1943 Cab 13 C8A HUP 1944 Cab 13 C15A with 2C1 box 1943 Cletrac M2 High Speed Tractor MkII Bren gun carrier chassis x 2
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#9
22-03-09, 04:36
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bearings
The part number on the boxes of NASCO bearings I have are:
M31155 .. the rear main shells appear to be 1 5/8" wide Mike
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1940 cab 11 C8 1940 Morris-Commercial PU 1941 Morris-Commercial CS8 1940 Chev. 15cwt GS Van ( Aust.) 1942-45 Jeep salad Last edited by Mike K; 22-03-09 at 05:14.
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