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lake Member
Joined: Aug 24, 2009 Posts: 32 Location: Nova Scotia ,Canada
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Posted: Sat May 21, 2011 3:47 pm Post subject: gas in engine oil |
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I think there may be a problem with my 1953 m38a1 , there seems to be a strong smell of gas on the dip stick . the oil was changed last fall ,so I fired it up for a short drive today and noticed the oil pressure switch was showing lower pressure than normal. the jeep work fine but I,am concerned about the smell of gas in the engine.The oil did look very discoloured,for new quaker state oil. Any idea ,s what to look for. thanks Lake |
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hill Member
Joined: Jun 06, 2009 Posts: 73 Location: Corbin, Ky.
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Posted: Sat May 21, 2011 7:08 pm Post subject: gas in oil |
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It is very possible that the diaphragm on the fuel pump side is cracked and leaking fuel into the oil pan causing it to thin the oil and have gas smell, this has happened on occasion.would need to replace or rebuild the pump. |
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G740 Member
Joined: Jan 27, 2006 Posts: 499
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Posted: Sun May 22, 2011 6:49 am Post subject: Pump |
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Your fuel pump is needing a new diaphragm. DO NOT run your engine until you change the oil and fix the pump. The gas will wash the engine clean and wipe it out.
John |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
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lake Member
Joined: Aug 24, 2009 Posts: 32 Location: Nova Scotia ,Canada
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Posted: Sun May 22, 2011 2:13 pm Post subject: |
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O.k thanks, guys I will not run my jeep until the oil has been changed and the fuel pump has been checked for damage .Would there be a diagram of the fuel pump any where before I challenge this project. Thanks Lake |
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RICKG Member
Joined: Aug 31, 2010 Posts: 1741 Location: SO IDAHO
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Posted: Mon May 23, 2011 7:33 am Post subject: |
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Go to Downloads, TM9 1828A. _________________ keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a |
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whydahdvr Member
Joined: Jul 18, 2008 Posts: 639 Location: Melrose, MA and Santa Fe, NM
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Posted: Mon May 23, 2011 11:58 am Post subject: |
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Does this apply to the M38's as well? I was told a few years ago that with the fording system on creating positive pressure that was how the gas smell got into the oil.
However, it sounds like that may not be the case after all. I'm concerned because I've driven it in a couple parades and around town lately and while I haven't noticed any engine trouble, aside from running rich, I don't want to cause any long-term damage. |
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Balvar24 Member
Joined: Sep 05, 2009 Posts: 191
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Posted: Mon May 23, 2011 12:12 pm Post subject: |
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Any engine with a mechanical engine mounted fuel pump could have this issue if there is an odor of gasoline in the engine oil. |
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dago_red Member
Joined: Nov 18, 2010 Posts: 75 Location: San Juan Island WA
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Posted: Fri Jun 03, 2011 1:19 pm Post subject: |
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Same happened with my A1 recently; I suspected a cracked diaphragm in it before putting it in the shed last December to get all the work done on it. The oil had a slight darkening- more of a blackish/gray color- and not the normal oil color after some miles have been put on after an oil change. No gas smell, just the strange color.
Last week, I finally- after a long wet,cold winter- got the jeep out and drove it. All seemed in good shape, but it was quickly obvious that the diaphragm was leaking: gas smell in the new oil, etc. By quickly obvious, I mean that I drove it a few times around the block and that was enough to see the problem. I had already bought the rebuild kit from MM and will now put it in. But I wasted $10 in oil by not changing out the diaphragm prior to the oil change. And the oil this time was the exact color as it was before.
Anyone know why it is you can't buy the rebuild kit for the vacuum portion of the pump? Is it because the diaphragm is no longer made?
Also, I was looking at the TM download; is our A1 pump the BK version? _________________ 54 M38A1 delivered 2-54
53 Strick M100 #79
70 DJ5A |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
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Posted: Fri Jun 03, 2011 11:52 pm Post subject: |
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Quote: | Anyone know why it is you can't buy the rebuild kit for the vacuum portion of the pump? Is it because the diaphragm is no longer made?
The rebuilders do not want to share them. I believe Then & Now will still sell you a complete kit.
Also, I was looking at the TM download; is our A1 pump the BK version?
Our stock M38, M38A1, M170 pumps all fall under the BK and BN types.
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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 |
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