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willysmjeeps.com :: View topic - M38 oil pan gasket
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M38 oil pan gasket

 
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horse
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Joined: Sep 08, 2019
Posts: 47
Location: Yorkshire U.K.

PostPosted: Thu Feb 27, 2020 12:49 pm    Post subject: M38 oil pan gasket Reply with quote

Hi, I would like to change the oil pan gasket we call it a sump gasket all the same I think.

The gasket has arrived and is made of cork, looking through some of the posts some use sealants as well.

Also noted was not to tighten the bolts up very much, just snug as not to deform the gasket.

So sealant yes or know, if yes the best places, also is there a tightening order on the bolts.

Thanks for any advice.
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wesk
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Posts: 14721
Location: Wisconsin

PostPosted: Thu Feb 27, 2020 1:26 pm    Post subject: Reply with quote

It helps you receive more accurate answers if you identify the make/model of the vehicle you are asking about. This is easily done automatically by simply adding that information to your signature element at the end of your post.

Using the correct service pubs and parts listing is very important as is occasionally referring to the civilian jeep manually that is most equivalent to your make/model jeep. Often times the civilian manual which is meant for use by both mechanics and owners will have more detail on certain procedures.

1 - And as is the norm all surfaces need to start out clean & dry.

2 - Make sure you pean the existing bolt holes in your pan back outward so the edge of the pan is perfectly even/flat.

3 - Follow directions in service manual for installation If sealant is required it will be mentioned. It is seldom used by pro's unless the manufacturer's data specifies a need for it. It makes the seal to pan surface slippery allowing the seal to migrate outward or inward during tightening which leads to unwanted leaks. Sometimes there will be light damage to either of the metal surfaces that will not clean up smooth. It is common practice to use a drying sealant or epoxy to smooth those out.

4 - Bolt tightening sequences if critical are usually published in the service manual. If nothing is published then the industry standard is to insert and snug the bolts in a diagonal crisscross then go back and torque them in a similar crisscross.
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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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horse
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Joined: Sep 08, 2019
Posts: 47
Location: Yorkshire U.K.

PostPosted: Thu Feb 27, 2020 1:43 pm    Post subject: Reply with quote

Thank you for the tips, in my ignorance I thought the oil pans on the L Head are the same.

I have seen some posts from people that put sealant on the pan side to hold the gasket in place then offer it up an hour or so later to try and stop any slip when tightening.

I will follow 1 - 4.

Signature sorted.



Thanks.
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1952 M38
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wesk
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Joined: Apr 04, 2005
Posts: 14721
Location: Wisconsin

PostPosted: Fri Feb 28, 2020 12:04 am    Post subject: Reply with quote

Differences in equipment are one reason it's a good thing to ID the vehicle you are discussing. Another thing is to help folks offer you the appropriate manual selections that may help.

The main problem with the old Army manuals is they are written on the assumption that they will be used by trained motor pool technicians. To get why and how answers from them is virtually impossible. One would have to review a motor pool technician's technical training course text books for these answers.

With the M38 the appropriate manual selections for this issue are the TM 9-1804A


This is all the Army thinks it needs to tell you.


Then you go to the index and look up "Torque Specs" Ahhh Page 121 Par 148 & 149, great.


Page 121 has NO TORQUE SPECS nor are any torque charts found anywhere in this manual!

Let's take a look at the Civilian Jeep service manual for the CJ series early (Up to 1964):


Voila, they even give the torque specs here. A note of caution here. This paragraph assumes the engine is on an engine stand and inverted so all you need do is lie the oil pan on the bottom of the block.


This chart is in Chapter "U" of this CJ manual.

The advice to use grease to hold the gasket in place is very poor advice. If you cannot keep your gasket still during installation then use a very light amount of drying gasket cement not RTV or other pasty sealants. Gasket cement is very tacky and thin and is usually applied with a very thin brush or special applicator. Usually this Hi Tac cement is a very thin dark brown fluid.
https://www.summitracing.com/parts/ptx-80062?seid=srese1&gclid=CjwKCAiA7t3yBRADEiwA4GFlI9mLT1gbv7MkVCax4ESTniMG5Mh3jZZIwbkbNR3aL1tvgFO3HdcuoBoCl60QAvD_BwE

Do not use silicon based sealants like RTV.

Watch this https://www.youtube.com/watch?v=eHEcf0itBuE
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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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horse
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Joined: Sep 08, 2019
Posts: 47
Location: Yorkshire U.K.

PostPosted: Fri Feb 28, 2020 12:08 pm    Post subject: Reply with quote

Good information thanks, I have found a lot of assumed knowledge with the T.M. I have seen on U Tube the sealant, thanks for giving the make.

Which is the best book to buy to give you more information as you have shown?
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wesk
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Joined: Apr 04, 2005
Posts: 14721
Location: Wisconsin

PostPosted: Fri Feb 28, 2020 12:25 pm    Post subject: Reply with quote

For the CJV35, M38, M606: http://www.willysmjeeps.com/v2/modules.php?set_albumName=album71&op=modload&name=gallery&file=index&include=view_album.php



For the M38A1, M170, M606A1 A2: http://www.willysmjeeps.com/v2/modules.php?set_albumName=album305&op=modload&name=gallery&file=index&include=view_album.php



I have a large part of these manuals loaded in my photo album page 3.
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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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horse
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Joined: Sep 08, 2019
Posts: 47
Location: Yorkshire U.K.

PostPosted: Fri Feb 28, 2020 12:57 pm    Post subject: Reply with quote

Thank you, I will have a good study.
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horse
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Joined: Sep 08, 2019
Posts: 47
Location: Yorkshire U.K.

PostPosted: Fri Feb 28, 2020 1:14 pm    Post subject: Reply with quote

Amazing bought the Permatex 80062 in the U.K, postage more than the product,least it is the correct product.
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