.014" or .016"??? |
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mbullism
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Posted: 21 Sep. 2020 at 11:19am |
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Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
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outlw21
Member Joined: 06 Aug. 2017 Location: bakersfield CA Status: Offline Points: 240 |
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look up Service Bulletin 48-52 in Service bulletin of the Research & History section
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Ol' Unreliable
Member Joined: 25 Sep. 2016 Location: CO Springs CO Status: Offline Points: 4226 |
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I thought I had read somewhere in the last 40-something years that the change from .014" to .016" was mostly for the convenience of the mechanic.
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There's a reason it's called Ol' Unreliable
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jaksjep
Member Joined: 03 Nov. 2013 Location: Southern CA Status: Offline Points: 471 |
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I had a friend and his Dad who owned a machine shop and built L134 engines for drag racing at the sand dunes. They built them to run the L134 at 700-8000 rpm all day!!! When I was in High School, they built my Dad an L134 for his '47 CJ2A and it ended up being my daily driver to school and back. They didn't build it "full race", but they did zip it up quite a bit and what a blast it was driving it. You could feel just how effortless and smooth it would zoom right up to 5000 rpm.
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My posts are my personal opinion and are not legal advice as I am not an attorney. If you act on any of my comments you do so at your own risk.
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SE Kansas 46 CJ-2A
Member Sponsor Member x 3 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 3190 |
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We raced jeeps in the mud back in the day but it wasn't a L134 motor.
CJ5 with a Rat motor, Dana 44 front, Dana 60 rear. |
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46 CJ-2A #64462 "Ol' Red" (bought April 1969)(second owner)(12 V, 11" brakes, M-38 frame, MD Juan tub)
U.S. Coast Guard Chief Petty Officer(ret.) U.S. Army Vietnam veteran and damned proud of it. |
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Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4905 |
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Hey, if they can race lawnmowers we can race Jeeps.
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If you can't get there in a Jeep you don't need to be there!
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mbullism
Member Sponsor Member x 4 Joined: 29 May 2015 Location: MA Status: Offline Points: 4783 |
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Now that right there is funny
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Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
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Bruce W
Member Joined: 29 July 2005 Location: Northeast Colorado Status: Offline Points: 9651 |
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At .016, the valve remains on the seat longer and has more time to shed heat to the block. You do lose a (tiny) bit of lift, duration and overlap but I doubt that any of us could feel the difference.
For racing purposes, .014. For longevity, .016. Depending on my mood, I often split the difference and set them at .015. No issues that I’m aware of. Again, as the old tractor manufacturers used to advise, “Don’t ‘lug’ your engine.” BW
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It is NOT a Jeep Willys! It is a Willys jeep.
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You! We Have Miles to Jeep, Before We Sleep. |
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Mark W.
Member Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7982 |
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Yes right after I posted that I knew it couldn't be as the spec changed well before rotating valves showed up in production.
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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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Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4905 |
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Mark,
My guess is the new spec had to do with avoiding burnt valves on existing engines.
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If you can't get there in a Jeep you don't need to be there!
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Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4905 |
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I set them to .016.
I figure it is always better to have a little more lash than to have them too tight, and there is not much difference between .014 and .016 anyway.
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If you can't get there in a Jeep you don't need to be there!
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Mark W.
Member Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7982 |
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Could the new spec have to do with rotating valves? or did the new spec come out before rotating valves? |
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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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Lee MN
Member Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4950 |
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An older and very wise mentor of mine once told me (valve adjusting) “If you can hear them (ticking) they aren’t burning!”... That being said, favor the loose side 🙀
Lee |
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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SE Kansas 46 CJ-2A
Member Sponsor Member x 3 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 3190 |
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Thanks Mike! I guess Ol' Red is good to go to Colorado Fall Color tour.
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46 CJ-2A #64462 "Ol' Red" (bought April 1969)(second owner)(12 V, 11" brakes, M-38 frame, MD Juan tub)
U.S. Coast Guard Chief Petty Officer(ret.) U.S. Army Vietnam veteran and damned proud of it. |
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mbullism
Member Sponsor Member x 4 Joined: 29 May 2015 Location: MA Status: Offline Points: 4783 |
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you want 0.016
The 0.014 is an older spec that was revised, though I don't recall exactly why. Edited by mbullism - 17 Sep. 2020 at 12:12pm |
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Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
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SE Kansas 46 CJ-2A
Member Sponsor Member x 3 Joined: 22 Jan. 2016 Location: S.E. Kansas Status: Offline Points: 3190 |
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I recently adjusted the valve tappets on Ol' Red, which was more or less just checking them. One exhaust tappet was slightly off at .015" instead of .016". My shop manual said to set the tappets at .016" cold. I did this and buttoned up the valve cover and am running it that way. All is good, I guess.
After she's all together and running, I am reading some more literature and notice that it called for .014". So, what is the deal? Is it .014" or .016"? Does it matter? If either setting will work, which is better, and why? Educate me on this... |
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46 CJ-2A #64462 "Ol' Red" (bought April 1969)(second owner)(12 V, 11" brakes, M-38 frame, MD Juan tub)
U.S. Coast Guard Chief Petty Officer(ret.) U.S. Army Vietnam veteran and damned proud of it. |
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