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horse
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Joined: Sep 08, 2019
Posts: 216
Location: Yorkshire U.K.
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 Posted: Wed Jun 12, 2024 3:55 am Post subject: P.C.V Baffle |
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When I was setting the Tappits I noticed the ventilator parts did not have a Baffle on the body fitted to the side valve cover.
I checked TM9-1804A page 68and it does not show one.
Looking through the parts lists on a GPW it does show Baffle GPW 6762 WO-630298.
I am interested why this Baffle was deleted. The only related threads was the possibility of the Baffle becoming blocked.
Another post said there was a factory instruction to remove the Baffle but I am unable to find this.
Does anybody know the reason or have a copy of the factory instruction?
Horse
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RonD2
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Posts: 1955
Location: South Carolina, Dorchester County
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| Posted: Wed Jun 12, 2024 8:32 am Post subject: |
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
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wesk
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Posts: 16289
Location: Wisconsin
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| Posted: Wed Jun 12, 2024 9:48 am Post subject: |
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That service bulletin only applies to the porous screen on the models 4-63 & 2WD's. The fixed baffle on the L & F 134 in the 4WD Universal type jeeps is not addressed here.
The ORD 9's 1951 and 1956 for the M38 never had a screen or baffle at all. It was obviously not a good idea and was discontinued on the later engines like the M38. Note that the service bulletin's date is 1948. 2 years before the M38 was produced.
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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
Last edited by wesk on Wed Jun 12, 2024 10:43 am; edited 2 times in total |
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4x4M38
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Location: Texas Hill Country
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RonD2
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Joined: Oct 02, 2014
Posts: 1955
Location: South Carolina, Dorchester County
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| Posted: Wed Jun 12, 2024 12:07 pm Post subject: |
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| wesk wrote: | That service bulletin only applies to the porous screen on the models 4-63 & 2WD's. The fixed baffle on the L & F 134 in the 4WD Universal type jeeps is not addressed here.
The ORD 9's 1951 and 1956 for the M38 never had a screen or baffle at all. It was obviously not a good idea and was discontinued on the later engines like the M38. Note that the service bulletin's date is 1948. 2 years before the M38 was produced. |
Porous screen? Is there any other kind? 
What "fixed baffle" are you referring to Wes?
My dipstick has what I'd call an "anti-sludge" baffle on it about half-way down.
Can't think of any others in the ventilation stream.
Maybe wrong, but it looks to me like they figured out the "crankcase ventilator screen" was a bad idea (or at least, unnecessary) on the L134 no matter what model it was installed in.
It makes sense that once they deleted it in 1948 it wouldn't appear in any subsequent year model (including the M38) documentation, manual, or bulletin.
| 4x4M38 wrote: | | Reading into the page, it seems the better fix would be to install an oil filter. |
I can't quite connect those dots with the bulletin, but believe having an oil filter is always the best bet for engine life.
Won't an oil filter also "sludge up" the same way under the same driving conditions they describe?
I think Willys sold it as an "option" for $3.25? 
I was just trying to answer Horses' question. 
Couldn't stop myself. You'd think I'd know better by now.
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
Last edited by RonD2 on Wed Jun 12, 2024 1:25 pm; edited 2 times in total |
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RonD2
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Joined: Oct 02, 2014
Posts: 1955
Location: South Carolina, Dorchester County
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| Posted: Wed Jun 12, 2024 1:00 pm Post subject: |
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Just so we're all on the same sheet of music, this is a photo of the WO-630298 ventilator baffle screen that Horse is asking about.
The Willys Service Bulletin doesn't give a part number but I assume this is the part they're referring to. Reasonable?
I see several vendors have stock for $10-$12 each if you change your mind and want one.
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51
“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari
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horse
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Joined: Sep 08, 2019
Posts: 216
Location: Yorkshire U.K.
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| Posted: Wed Jun 12, 2024 2:13 pm Post subject: |
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Excellent, thanks for the information.
The photo for the Baffle is the same as I have but will not be now fitting.
Horse
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