bypass hose fitting

[buzzk]

looking for the bypass hose fittigs for the head and water pump or a part # thx buzz

[wesk]

ORD 9 SNL G-740 M38 parts list page 96 Cooling System Group 0503 Nipple, hose, 1/4" P thread. ORD# 7372808, WO# 649720, NSN 4730-00-737-2808. Note this is illustrated in Fig 05-2 as Item F in the water pump but the listing on page 96 says "Head". Just a slight mis-statement but I believe both are the same.

A description of the part:

[chrisk]

Maybe this help:

The water pump and cylinder head of the M38A1 has the same Nipple # 7372808, WO-645905.
See ORD9 SNL G-758,Sept1956, page 109:
2 pcs. Nipple, hose 1/4"-18NF pipe thd x1 1/4"
(cilinder head(1); water pump(1))


I can send a photo or drawing, let me know.
Chris
_________________
2x 1956 M38A1(Nekaf);1954 1/4TON trailer,Polynorm(Dutch);1983 Honda VF750C (Magna)

[G740]

Midwest Military has them in stock.
John

[pockers]

Hi can anyone just confirm the thread size for me for the bypass hose nipple?

mine has sheared off in the block - was planning to re tap the thread unless anyone can recommend a better way

many thanks

Andy (UK)

[wesk]

Andy,

1/4" Pipe US sizing NPT.

Here's a handy PDF document that will keep international pipe threading groups separate and clear in your mind.

https://www.colder.com/Portals/0/Library/Resources/Literature/WhitePapers/Documents/NPT_whitepaper.pdf

It may sound a bit confusing but NPT is American Syandard Taper Pipe Thread.

For example here's the external NPT thread information:

American Standard Taper Pipe External Thread
Nominal size - Actual OD - Threads - Length of engagement - Length of
per inch (tightened by hand) - effective thread
1/8 0.407 27 0.124 3.3 turns 0.260
1⁄4 0.546 18 0.172 3.1 turns 0.401
3/8 0.681 18 0.184 3.3 turns 0.408
1/2 0.850 14 0.248 3.4 turns 0.534
3/4 1.060 14 0.267 3.7 turns 0.546
1 1.327 11.5 0.313 3.6 turns 0.682
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

[wesk]

Andy,

1/4" Pipe US sizing NPT.

Here's a handy PDF document that will keep international pipe threading groups separate and clear in your mind.

https://www.colder.com/Portals/0/Library/Resources/Literature/WhitePapers/Documents/NPT_whitepaper.pdf

It may sound a bit confusing but NPT is American Standard Taper Pipe Thread.

For example here's the external NPT thread information:
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

[pockers]

Wes, many thanks, again your knowledge has proved invaluable


Any ideas the best way of removing the pieces of the old nipple that are stuck in the thread?




Regards
Andy
Uk

[wesk]

If all that's left are the old male threads wedged into the female threads then a thread chaser would work. If you have a solid ID of the nipple plus the male threads then a piece of taper square stock steel that will fit tightly in the remaining stub and driven it then turned with a spanner. Pre-soaking with a penetrant goes without saying and often times heat will help.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

[pockers]

Unfortunately it's only bits stuck in the thread so I'll see how I go

Thanks for all the help



Andy