M151A2 CLUTCH ADJUSTMENT

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.

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M151A2 CLUTCH ADJUSTMENT

Postby allanbashbury » Tue Jan 19, 2010 8:05 pm

I am a newbee. I just purchased a M151A2 and have not gotten any manuals yet. Can anyone explain to me how to adjust the clutch. It grabs at the end of the travel or what could be considered the top of the pedal. Also, any suggestions on which manuals I need and where to get them.
Allan Ashbury
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Re: M151A2 CLUTCH ADJUSTMENT

Postby Francis Marion » Tue Jan 19, 2010 10:21 pm

The first place you should look for 151 manuals is http://www.g838.org/added_pages/manuals.html. My clutch grabs at the end of travel too and I've been told that the problems is most likely the type of clutch installed rather than any kind of adjustment.
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Re: M151A2 CLUTCH ADJUSTMENT

Postby muttguru » Wed Jan 20, 2010 3:06 am

Francis Marion wrote:The first place you should look for 151 manuals is http://www.g838.org/added_pages/manuals.html. My clutch grabs at the end of travel too and I've been told that the problems is most likely the type of clutch installed rather than any kind of adjustment.



Allan,
Francis is right on both points. You need to download the TMs BEFORE you do any work on the vehicle (not after, when something has gone wrong !).

And the clutch issue features regularly on the Boards. Have a look at my post on the G503 at:-

viewtopic.php?f=19&t=156164&start=15

where you can see pictures of both types of clutch disk.
Hope this helps........
Kind Regards, Ken muttguru@aol.com
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Never mind..."I think it's ok"...Check it again !
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Re: M151A2 CLUTCH ADJUSTMENT

Postby allanbashbury » Wed Jan 20, 2010 5:59 pm

I can't believe that there is no clutch adjustment. It doesn't look hard to make it adjustable and think I might modify mine. Thanks for the information.
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Re: M151A2 CLUTCH ADJUSTMENT

Postby Rickf » Wed Jan 20, 2010 6:41 pm

No adjustment? Where did you get that from? The clutch on a 151 is adjustable.

Rick
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
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Re: M151A2 CLUTCH ADJUSTMENT

Postby allanbashbury » Wed Jan 20, 2010 8:36 pm

Rick,
Can you explain how and where you can adjust it please?
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Re: M151A2 CLUTCH ADJUSTMENT

Postby Horst » Thu Jan 21, 2010 5:12 am

As said, get the manual first, there it is explained. That rod coming out of the bell housing has a thread. Disconnect it at the point where the return spring is attached and turn it in or out depending on which direction you have to go.
Horst
1962 M201 w/ trailer
1972 USMC M151A2 w/ROPS and M416
1966 Pontiac GTO
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Re: M151A2 CLUTCH ADJUSTMENT

Postby Rickf » Thu Jan 21, 2010 5:33 am

Horst is right, also if you turn it out too far you will unscrew it from the adjuster and then most likely have to pull the lower cover to get it back together. Go to the G838.org, the manuals are there for free download.

Have you checked all of the pivot points in the linkages for wear?


Rick
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: M151A2 CLUTCH ADJUSTMENT

Postby allanbashbury » Thu Jan 21, 2010 6:07 am

Thank you gentlemen. I did go to the manuals and thank you for the web page. Since it is adjustable, not mentioned in the manuals or the forum much, do you put up with it grabing at the end of the travel? I understand the two types of clutchs etc. and when a clutch needs replacing. I have been a mechanic both on cars and airplanes for over fifty years
Allan
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Re: M151A2 CLUTCH ADJUSTMENT

Postby Rickf » Thu Jan 21, 2010 8:32 am

Allen, The clutch should be able to be adjusted within the normal range. I would try to screw that rod in a couple turns at a time until you get the proper free play at the pedal. At that point it should engage further down. If you have the ceramic style clutch they are very grabby, they are basically in or out with not much slip to them. I prefer my clutch to engage closer to the floor than the specs so I adjust it accordingly. If you can't get the engagement further down in the range then there might be a bent linkage or worn flywheel. I just pulled mine and I can tell you that the ceramic clutch ate the flywheel!


Rick
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: M151A2 CLUTCH ADJUSTMENT

Postby allanbashbury » Thu Jan 21, 2010 5:19 pm

Rick,
Thanks for the information. I will work with it this weekend. It has been raining cats and dogs for three days here in SoCal and I have it under a carport right now. If I don't get the feel and action from the clutch that i want I will replace it. Have you ever heard of anyone having a clutch disc and presuure plate custom made for a M151? They don't cost that much.
Allan- US Army
SE.Asia 1962
Germany 1963-64 (Where we had M151's)
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Re: M151A2 CLUTCH ADJUSTMENT

Postby Rickf » Fri Jan 22, 2010 5:29 am

Allan, I never heard of a custom clutch. There is really no need since the originals are readily available. I am replacing my flywheel, along with a clutch set from the A1 which uses a fiber disc instead of the ceramic puck.

Rick
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: M151A2 CLUTCH ADJUSTMENT

Postby Kurt Lesser » Fri Jan 22, 2010 1:59 pm

Allan,

As I remember there were two different clutch discs used in the 151 jeeps. One had a full circle of friction material and the other have 3 (?) pads on it. I believe that was often referred to as the suicide clutch because it was either engaged or disengaged and there was very little "slip" room on the pedal stroke. Something else that could affect the clutch would be if someone had it relined and the wrong friction material was used.

Kurt
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