M38a1/M170 Ventilation valve

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

Hello, I have a 1955 M170, is it suppose to have a ventilation valve on left side of engine or a 2" hose. Mine has a 2" hose and didnt know if it was a field fix?

Brian
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Brian
1955 M170
1940 BSA M20

wesk · Posted: Sat Jun 07, 2014 6:32 pm Post subject:

All M38's, M38A1's & M170's came with a PCV valve on the left side valve cover area. Only the early M38A1's (52-53) and USMC contract M38A1's came with the fording valves. Later were sometimes added and earlier were usually removed and substituted with a short hose. But the PCV valve (Positive crankcase ventilation) stayed on all. If it was removed by a not so smart prior owner then get one and re-install it.

Most A1's look like this with the PCV valve still there and the fording valve gone.
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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

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

Perfect, this is exactly the info i needed.

Thanks!
Brian
_________________
Brian
1955 M170
1940 BSA M20

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

On a different subject, where did u get that 6" flexible fuel line. I could use one.
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Brian
1955 M170
1940 BSA M20

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

Also, which direction should PCV go..
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Brian
1955 M170
1940 BSA M20

wesk · Posted: Sat Jun 07, 2014 7:20 pm Post subject:

This is the original plumbing on the 52 & 53 M38A1's.

Here's a new in the crate 1962 issue replacement engine:

In the image below from TM 9-8014 Fig 52 dated April 1955, you see the short piece of rubber hose instead of the fording valve.

In this image below from TM 9-8015-1 Fig 4 dated Mar 54, you see the fording valve is included.

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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 · Posted: Sat Jun 07, 2014 7:25 pm Post subject:

The whole system, both standard crankcase ventilation and the fording valve systems are explained in great detail in TM 9-8015-1 chapter 6.

If you don't have it now, download it free:
http://www.willysmjeeps.com/v2/modules.php?name=Downloads&d_op=getit&lid=85
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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

skyjeep50 · Member Joined: Feb 20, 2007 Posts: 606 Location: Illinois

bl5211a - flexible fuel lines are available from a number of MV parts suppliers. You could try Midwest Military.
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1951 M38

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

Thanks..

Here's how they ended up:

_________________
Brian
1955 M170
1940 BSA M20

wesk · Posted: Sun Jun 08, 2014 10:46 am Post subject:

You can also take your old line to any car parts dealer that can use the printed catalog and they can locate the same or close enough with a female 5/16" steel tube fitting on one end and a male 5/16" steel =tube fitting on the other end.
_________________
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

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

thanks..
_________________
Brian
1955 M170
1940 BSA M20


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