GPW oil pan bolts
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- G-Major
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GPW oil pan bolts
I don't believe that I have seen this subject discussed before. I have found GPW oil pan bolts, P/N 20326-S7, 5/16X18X5/8, with three different head markings. All are recessed head bolts. One has concentric rings with HTS in the center. One has concentric rings with a block letter E in the center. One has a block number 1 with no rings. Has anybody seen any other markings? I have found HTS and E markings mixed on the same engine. Any comments?
Richard Grace
Richard Grace
Richard Grace
Palmetto, Georgia
Palmetto, Georgia
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Re: GPW oil pan bolts
And the drawings for that Ford Part No. may indicate the manufacturer. SEMs would be a good candidate.
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- Chuck Lutz
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Re: GPW oil pan bolts
Richard:
here are some that Ian F. posted:
here are some that Ian F. posted:
Chuck Lutz
GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
Bantam T3-C 1947
GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
Bantam T3-C 1947
- Old Pal
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Re: GPW oil pan bolts
I took off my oil pan and ten of the bolts were "F" marked, non-recessed. The rest were "A" and "E" marked. None were recessed. Motor is GPW 13551. Is it possible the "F" bolts are factory? I don't know why recessed would be replaced by "F" marked considering the known history of this jeep.
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Re: GPW oil pan bolts
I can see some rebuild depot throwing all the 5/16 X 5/8 bolts in the same bin and just grabbing the first 20 they put their hands on to install an oil pan......... -RG
Richard Grace
Palmetto, Georgia
Palmetto, Georgia
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Re: GPW oil pan bolts
Hi Richard,
I have no hard data (or that i remember!), but from talking to many 1st and early 2nd contract owners, it seems that these early GPW's used F marked bolts and the sems bolts with recessed head didnt appear until much later.
I know that doesnt answer your 3 different markings Q, but thought it worthy to add.
I have only seen the HTS marking on bolts here in Australia on GPW blocks. Granted, i havent seen alot of originals (maybe a dozen or so?), but have a few odd bolts turn up over the years in lots ive bought and they have only been the same marking as the others i have collected prior to them (which are the same as on the photo Chuck posted of GPW 229006's block)
Ian.
I have no hard data (or that i remember!), but from talking to many 1st and early 2nd contract owners, it seems that these early GPW's used F marked bolts and the sems bolts with recessed head didnt appear until much later.
I know that doesnt answer your 3 different markings Q, but thought it worthy to add.
I have only seen the HTS marking on bolts here in Australia on GPW blocks. Granted, i havent seen alot of originals (maybe a dozen or so?), but have a few odd bolts turn up over the years in lots ive bought and they have only been the same marking as the others i have collected prior to them (which are the same as on the photo Chuck posted of GPW 229006's block)
Ian.
Australian Jeep Investigator
MB: 131175
GPW: 11730.
GPW: 225290.
Aust trailer: GMH 3- #211
http://www.vintageengines.net
MB: 131175
GPW: 11730.
GPW: 225290.
Aust trailer: GMH 3- #211
http://www.vintageengines.net
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Re: GPW oil pan bolts
Slightly off-topic and bumping an old thread:
I've found that the Pioneer brand # 859020 oil pan bolt set for the small block Mopar V8's is very close to correct for the GPW's Sems bolts and are very inexpensive as a 20 piece set from places like Summit Racing! They fit perfectly and have the correct style, 1/2" hex and thread length, but are unmarked in the center depression:
Currently under $7 a set!
http://www.summitracing.com/parts/pio-859020/overview/
Hope this helps someone!
I've found that the Pioneer brand # 859020 oil pan bolt set for the small block Mopar V8's is very close to correct for the GPW's Sems bolts and are very inexpensive as a 20 piece set from places like Summit Racing! They fit perfectly and have the correct style, 1/2" hex and thread length, but are unmarked in the center depression:
Currently under $7 a set!
http://www.summitracing.com/parts/pio-859020/overview/
Hope this helps someone!
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Re: GPW oil pan bolts
Nice find, Marty.
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Re: GPW oil pan bolts
The Pioneer bolts seem to better match the style of a couple originals I have as seen in one of the posts above.
I've also used Pioneer Chevy oil pan bolt sets to get 1/4"-20 Sems bolts (And a few 5/16" bolts) for use on the transmission and brake fluid access covers.
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license
- lt.luke
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Re: GPW oil pan bolts
12078 has a complete set of F marked, non-recessed head bolts. So, yes, it's possible.Old Pal wrote:I took off my oil pan and ten of the bolts were "F" marked, non-recessed. The rest were "A" and "E" marked. None were recessed. Motor is GPW 13551. Is it possible the "F" bolts are factory? I don't know why recessed would be replaced by "F" marked considering the known history of this jeep.
Luke Sparks
MAJ (R), USA
GPW 12078 http://g503.com/forums/viewtopic.php?f=95&t=102532
https://www.homesteadersfinest.com/
MAJ (R), USA
GPW 12078 http://g503.com/forums/viewtopic.php?f=95&t=102532
https://www.homesteadersfinest.com/
- Chuck Lutz
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Re: GPW oil pan bolts
I wonder what bolts were used on the GP oil pans?
Chuck Lutz
GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
Bantam T3-C 1947
GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
Bantam T3-C 1947
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