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Old 31-05-19, 01:58
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Brian Asbury
 
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Default M38A1 CDN3 wheel nut question

The 1970 M38A1 has large wheel nuts that use a 13/16” wheel wrench rather than the common 3/4” wheel nut wrench used on WW2 jeeps and M38 and M38A1. But can someone check their CDN3 to see if all the nuts are Right hand thread on both sides of the vehicle. The parts book Supplement is unclear and I don’t have a CDN3 to inspect.
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Old 31-05-19, 02:05
chris vickery's Avatar
chris vickery chris vickery is offline
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Brian, my CDN3 has 13/16" lug nuts that are all RH thread
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1968 M274A5 Mule Baifield USMC
1966 M274A2 Mule BMY USMC
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1981 MANAC 3/4T CDN trailer
1943 Converto Airborne Trailer
1983 M1009 CUCV

RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......

OMVA, MVPA, G503, Steel Soldiers
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Old 31-05-19, 05:12
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Kolten Hooper Kolten Hooper is offline
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Hi Brian,
If there is still any suspicion of being otherwise... mine is set up the same as Chris's.

All the best and hope to see you at Aquino!
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M38A1 CDN3 - CFR 70-08892
Can-am Motorcycle - CFR 83-61617
Kawasaki KLR250 - CFR 95-10915
Chevrolet M1009 Blazer CUCV
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  #4  
Old 31-05-19, 06:22
rob love rob love is offline
carrier mech
 
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Yep, all rh nuts on a Cdn3. The thing about left hand nuts on the left side self tightening turned out to be fiction.
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Old 31-05-19, 16:42
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Brian Asbury
 
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Thanks to all for their observations. Interestingly the correct nut 5310-00-391-0687 is described as being "self-locking" and having an "all metal locking feature". I suspect the threads are slightly distorted to make them self-locking. The "all metal" feature means they are not to be "Nylock" or other non-metal locking feature. Look carefully at your original wheel nuts and see if you can see a dimpling or punch marks on the flat hole opening that indicate if the threads were distorted. ……….. Brian
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Old 31-05-19, 18:58
Grant Bowker Grant Bowker is offline
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I know the discussion is about M38A1 but another vehicle of the same vintage, my M135, had many self-locking nuts of the type shown below, BUT the wheel nuts were ordinary commercial items (no locking function). I don't recall ever having seen self locking wheel nuts. Maybe I'm not observant enough... Also some of the distorted lock nuts require significantly more torque to run down the bolt/stud compared to a regular nut (and more as they get larger).
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Old 31-05-19, 23:47
rob love rob love is offline
carrier mech
 
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When I look up that NSN, it comes up with a number of commercial numbers. Included in that is Kelsey Hayes X1023R, which is a fairly common civilian number. There is nothing self locking about those, aside from perhaps the 60° cone. Perhaps they consider that the locking feature.

The NSN was still valid for certain other equipment in Canada until 2017. The US list it as being for: ENGINE, AIRCRAFT T-64,F117A AIRCRAFT,SHIPBOARDMATERIAL HANDLING EQUIPMENT (MHE), INTEGRATED UNDERWATER SURVIELLANCE SYSTEMSAIRCRAFT, ORION P-3,AIRCRAFT, HAWKEYE E-2C
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