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willysmjeeps.com :: View topic - rectangular washers for fuel pump mounting bolts
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rectangular washers for fuel pump mounting bolts

 
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keats
Member


Joined: Apr 14, 2005
Posts: 173
Location: Middletown Ct

PostPosted: Mon Apr 17, 2017 10:06 am    Post subject: rectangular washers for fuel pump mounting bolts Reply with quote

A friend of mine working on his M38 threw me this question.

What is the purpose of the two rectangular washers that are used on the fuel pump mounting?

I did not remember any "rectangular washers" when doing my M38 so I looked further.

No mention of them in the maintenance manuals for removing and replacing the pump. No pictures anywhere. I have included links to both the M38 and the M38A1 Ord 9 manuals that list the washers, and a picture of them.

http://willysmjeeps.com/v2/modules/gallery/albums/Gary-Keating/m38_0rd_9_002.sized.png

http://willysmjeeps.com/v2/modules/gallery/albums/Gary-Keating/m38a1_ord_9_002.sized.png


http://willysmjeeps.com/v2/modules/gallery/albums/Gary-Keating/rectangular_washers_fuel_pump.jpg
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Gary Keating
1949 C3A, 1952 M38,
1954 M170, 1957 Cj3B
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RonD2
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Joined: Oct 02, 2014
Posts: 190
Location: South Carolina, Dorchester County

PostPosted: Tue Apr 18, 2017 11:21 pm    Post subject: Reply with quote

Ok, after circling the trap watching for a reply, I can't resist. What a great obscure pointed question! Learning every day. I mounted my pump awhile back and mine are missing (need to study that manual better and take NOTHING for granted). I'm just a rookie spit-balling here. It seems to me that

(1) they protect the flange on the aluminum pump body from getting chewed up by steel lock washers?

(2) they allow the lock washers do the job because their square shape won't spin against the shape of the pump body?

(3) they spread the load of the bolts better through the pump flange and body?

(4) they prevent the bolts from penetrating into the block too far?

(5) all of the above?

(6) none of the above?

Looking to learn, and looking for 2 each 805842 washers. It looks like NOS may be available, but shouldn't be too hard to fabricate a pair if not. The only dim missing from the manual was the thickness.

Also discovered there's one more on the oil pump that I can't say for sure is there.
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Ron D.
1952 M38, no data plates, year and pedigree unknown, marked 20932721 (last 5 digits from SCDMV assigned VIN)
1951 M100, Dunbar Kapple 01169903, dod 5/51 to the U.S.A.
1954 M100, Dunbar Kapple M750759, dod 1/54 to the U.S.M.C.
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wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 12751
Location: Wisconsin

PostPosted: Wed Apr 19, 2017 7:36 am    Post subject: Reply with quote

Thickness is in the ord 9. Problem is the dimensions given are very odd for a rectangular washer:

0.406 diameter
0.660 ID
0.940 OD
0.0598 Thick
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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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RonD2
Member


Joined: Oct 02, 2014
Posts: 190
Location: South Carolina, Dorchester County

PostPosted: Wed Apr 19, 2017 9:58 am    Post subject: Reply with quote

Thanks Wes. Lucky for me that Peter DeBella has them NOS just ordered. Saved me from fabricating some which can get ugly......measure it with a micrometer, mark it with a crayon, cut it with an ax....... Shocked
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Ron D.
1952 M38, no data plates, year and pedigree unknown, marked 20932721 (last 5 digits from SCDMV assigned VIN)
1951 M100, Dunbar Kapple 01169903, dod 5/51 to the U.S.A.
1954 M100, Dunbar Kapple M750759, dod 1/54 to the U.S.M.C.
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