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Knuckle stud upgrade |
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jeeper50 ![]() Member ![]() ![]() Sponsor Member Joined: 01 Mar. 2008 Location: Georgia Status: Offline Points: 2235 |
![]() ![]() ![]() ![]() ![]() Posted: 20 Jan. 2020 at 5:25pm |
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With Stan's recent knuckle stud problem I began researching info about this upgrade to our steering knuckles. I found some info over on the ECJ5 forum. It replaces the studs with 3/8-24 button head cap screws to keep the studs from pulling the threads out of the knuckle. No pics but good info none the less. Requires you to clearance the new button head bolts for gouging the sealing surface of the knuckle, as if they never leak
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'53 Cj3B 4 cyl,clifford research header, D25/D44 lockrights,11" brakes, Belleview ol skool winch.
Texan at heart,GA by paycheck |
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SE Kansas 46 CJ-2A ![]() Member ![]() Sponsor Member x 2 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 2078 |
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Message deleted
Edited by SE Kansas 46 CJ-2A - 21 Jan. 2020 at 8:07pm |
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46 CJ-2A #64462 "Ol' Red" (purchased April 1969)
U.S. Coast Guard Chief Petty Officer (ret.) U.S. Army Vietnam veteran and damned proud of it. |
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44bz ![]() Member ![]() Joined: 17 Feb. 2018 Location: Oregon Status: Offline Points: 167 |
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I did this upgrade on my J2000 and am about to do it on the 2a since I'm upgrading to discs. Just ordered those studs actually.
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46 CJ2a - Buick 225, T90/D18
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Mark W. ![]() Member ![]() ![]() Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 6057 |
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Keep in mind there are no Grade 8 button head bolts in US threads Least not that months of searching on my part could turn up. To get real strong Button Head Bolts for my Roll Bar mounting plates I had to bite the bullet and go with Grade 10.9 Metric. I used 8mm to replace the 3/8" bolts I wanted to use. Luckily I found this out before drilling holes so I could have them match the Bolt Diameter. Std Grade 5 Hex Head bolt 120,000 psi tensile strenght Std. Grade 8 Hex Head bolt 150,000 " " " High strength Socket Head bolt 170,000 " " " Std Button Head Bolt Alloy 120,000 " " " 18-8 Button Head Bolt Stainless 70,000 " " " HALF AS STRONG AS GRADE 8 316 Button Head Bolt Stainless 70,000 " " " HALF AS STRONG AS GRADE 8 Grade 10.9 Hex Head bolt 150,000 " " " Just some food for thought Edited by Mark W. - 20 Jan. 2020 at 8:39pm |
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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64CJ5 ![]() Member ![]() ![]() Sponsor Member Joined: 15 Nov. 2013 Location: NE Wyoming Status: Offline Points: 777 |
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I got my info on this up grade from the Jeep CJ rebuilder's Manual 1946-1971 By Moses Ludel. I did the up grade on my 1964 CJ5 with the model 27 axle.
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64CJ5 "Eeyore"
01TJ "Tigger" 52 M38 Severely demilitarized, Now in sick bay. "Popeye" The Coast Guard Jeep. To Trust Government Defys Both History and Reason. |
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unclemoak ![]() Member ![]() ![]() Joined: 06 Oct. 2018 Location: Englewood, CO Status: Offline Points: 335 |
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Just ordered a piloted counter bore and button head bolts from McMaster to try this on a spare set of knuckles. Should have everything on Wednesday.
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Ol' Unreliable ![]() Member ![]() ![]() Joined: 25 Sep. 2016 Location: CO Springs CO Status: Offline Points: 4124 |
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I did this to Ol' Unreliable about 15 years ago. I made a mistake in not grinding clearance for the button heads when the knuckles go to turning limit. I just adjusted the steering stops but now I have a much larger turning radius than I would prefer. I can still get kuh-nuckle kuh-nock (with Rzeppa joints), so maybe I need to adjust the stops out more.
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There's a reason it's called Ol' Unreliable
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jeeper50 ![]() Member ![]() ![]() Sponsor Member Joined: 01 Mar. 2008 Location: Georgia Status: Offline Points: 2235 |
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Post pics of tooling and your progress on those knuckles
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'53 Cj3B 4 cyl,clifford research header, D25/D44 lockrights,11" brakes, Belleview ol skool winch.
Texan at heart,GA by paycheck |
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unclemoak ![]() Member ![]() ![]() Joined: 06 Oct. 2018 Location: Englewood, CO Status: Offline Points: 335 |
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Will do. I was planning to do a small write up and video.
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Spinnas ![]() Member ![]() Joined: 24 Apr. 2018 Location: AZ Status: Offline Points: 313 |
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Interested to see this. I have contemplated going to “D44” knurled spindle studs.
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wheelie ![]() Member ![]() ![]() Sponsor Member Joined: 24 Jan. 2011 Location: red lion. pa Status: Offline Points: 636 |
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I have s few pictures of mine somewhere. I'll try to find and post them.
Edited by wheelie - 21 Jan. 2020 at 6:53pm |
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oldtime ![]() Member ![]() ![]() Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 2177 |
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Here's mine I did a couple years back along with the double knuckle modification.
Casting cuts very easy so I just milled the flat area by hand on a drill press.
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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jeeper50 ![]() Member ![]() ![]() Sponsor Member Joined: 01 Mar. 2008 Location: Georgia Status: Offline Points: 2235 |
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Great pics, what is the P/N for those bolts spot facer if you still have them.
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'53 Cj3B 4 cyl,clifford research header, D25/D44 lockrights,11" brakes, Belleview ol skool winch.
Texan at heart,GA by paycheck |
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unclemoak ![]() Member ![]() ![]() Joined: 06 Oct. 2018 Location: Englewood, CO Status: Offline Points: 335 |
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Here are the numbers from McMaster
3102A25 - High-Speed Steel Changeable-Pilot Counterbore, 21/32" Body Diameter with 4 Flutes 3103A3 - Steel Pilot for Changeable-Pilot Counterbores, 3/16" Shank Diameter with 3/8" Pilot Head 91255A647 - Button Head Hex Drive Screw, Black-Oxide Alloy Steel, 3/8"-24 Thread, 1-1/4" Long, packs of 25 |
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GeorgiaFlattie ![]() Member ![]() Sponsor Member Joined: 08 Feb. 2017 Location: Canton, GA Status: Offline Points: 111 |
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Thanks for sharing those part numbers. That's valuable tech.
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unclemoak ![]() Member ![]() ![]() Joined: 06 Oct. 2018 Location: Englewood, CO Status: Offline Points: 335 |
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My mistake, you actually need the 5/16 pilot. The 3/8 is too big (I wasn't thinking about the major vs minor diameter of the threads)
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unclemoak ![]() Member ![]() ![]() Joined: 06 Oct. 2018 Location: Englewood, CO Status: Offline Points: 335 |
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Here's a video I did on how to do this upgrade.
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Fltfndr ![]() Member ![]() Joined: 01 Nov. 2013 Location: Clive, IA Status: Offline Points: 559 |
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Anybody know if these same mods to the knuckle are necessary with a spicer axle?
Fltfndr
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Fltfndr
1948 CJ2A Restomod "Six Pac" The object of war is not to die for your country, but make the other bastard die for his. George S. Patton |
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