[MV] M-1009 flex plate problems

Hi Guys,

My M-1009 is starting to worry me. I had the transmission rebuilt with new
parts. I ran it to and from work a couple of times, nothing rough at all.
I drove around the area several times, again no rough stuff. I started
hearing noises coming from the flex plate area and found the cover bent and
cracked. I installed a used but in great shape cover that I bought from a
very nice gentleman named Robert on this list, (thank you again Sir), but
the noise was still there. I pulled the cover back off and found that the
flex plate, (fly wheel), has started to crack just like the other one did!

Any ideas as to the cause of this cracking? The durn thing is coming apart
on me again just like the last time two rebuilds ago.

Any help and/or ideas would be most appreciated!

Best Regards,

Ed


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At 9:12 PM -0400 7/6/04, Ed Kirkley wrote:[color=blue]
>Hi Guys,
>
>My M-1009 is starting to worry me. I had the transmission rebuilt with new
>parts. I ran it to and from work a couple of times, nothing rough at all.
>I drove around the area several times, again no rough stuff. I started
>hearing noises coming from the flex plate area and found the cover bent and
>cracked. I installed a used but in great shape cover that I bought from a[/color]

Cound you have a body/chassis break that is=20
causing the transmission to flex far more than it=20
is supposed to?

--
--
Ryan Gill [email]rmgill@SPAMmindspring.com[/email]
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| | | -=3D=3D----
| O--=3D- | | /_8[*]=B0_\
|_/|o|_\_| | _________ | /_[=3D=3D=3D]_\
/ 00DA61 \ |/---------\| __/ \---
_w/|=3D_[__]_=3D \w_ // [_] o[]\\ _oO_\ /_O|_
|: O(4) =3D=3D O :| _Oo\=3D=3D=3D=3D=3D=3D=3D/_O_ |____\ /____|
|---\________/---| [__O_______W__] |x||_\ /_||x|
|s|\ /|s| |s|/BSV 575\|s| |x|-\| |/-|x|
|s|=3D\______/=3D|s| |s|=3D|_____|=3D|s| |x|--|_____|--|x|
|s| |s| |s| |s| |x| |x|
'60 Daimler Ferret '42 Daimler Dingo '42 Humber MkIV (1/3)
----------------------------------------------------------

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"The Diesel Page" had an article on heavy duty flex plate. They also have
articles on more power from 6.2l, adding a turbo, or overdrive,....etc. You
might have to search their archieves. link:
[url]http://www.62-65-dieselpage.com/new.htm[/url]
Derek
----- Original Message -----
From: "Ed Kirkley" <mojoedd@bellsouth.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Tuesday, July 06, 2004 9:12 PM
Subject: [MV] M-1009 flex plate problems

[color=blue]
> Hi Guys,
>
> My M-1009 is starting to worry me. I had the transmission rebuilt with[/color]
new[color=blue]
> parts. I ran it to and from work a couple of times, nothing rough at all.
> I drove around the area several times, again no rough stuff. I started
> hearing noises coming from the flex plate area and found the cover bent[/color]
and[color=blue]
> cracked. I installed a used but in great shape cover that I bought from a
> very nice gentleman named Robert on this list, (thank you again Sir), but
> the noise was still there. I pulled the cover back off and found that the
> flex plate, (fly wheel), has started to crack just like the other one did!
>
> Any ideas as to the cause of this cracking? The durn thing is coming[/color]
apart[color=blue]
> on me again just like the last time two rebuilds ago.
>
> Any help and/or ideas would be most appreciated!
>
> Best Regards,
>
> Ed
>
>
> ===Mil-Veh is a member-supported mailing list===
> To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
> To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
> To reach a human, contact <ack@mil-veh.org>[/color]



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Hi Derek
Those flex plates typically last the life of the vehicle. The only
reason most of them are changed is due to the ring gear being stripped.
You should be sure that it was installed correctly, and that the
transmission bellhousing is fully seated to the engine block all
around. A problem happens if the transmission hangs up on the dowls or
has some material lodged under the seating edge when it is bolted up.
If it is not seated exactly right there will be a mis-alignment that
will flex and fatigue the steel flex plate with every revolution,
causing it to crack and fail quickly.

Glenn
M1009

derek wrote:
[color=blue]
>"The Diesel Page" had an article on heavy duty flex plate. They also have
>articles on more power from 6.2l, adding a turbo, or overdrive,....etc. You
>might have to search their archieves. link:
>[url]http://www.62-65-dieselpage.com/new.htm[/url]
> Derek
>----- Original Message -----
>From: "Ed Kirkley" <mojoedd@bellsouth.net>
>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>Sent: Tuesday, July 06, 2004 9:12 PM
>Subject: [MV] M-1009 flex plate problems
>
>
>
>[color=green]
>>Hi Guys,
>>
>>My M-1009 is starting to worry me. I had the transmission rebuilt with
>>
>>[/color]
>new
>
>[color=green]
>>parts. I ran it to and from work a couple of times, nothing rough at all.
>>I drove around the area several times, again no rough stuff. I started
>>hearing noises coming from the flex plate area and found the cover bent
>>
>>[/color]
>and
>
>[color=green]
>>cracked. I installed a used but in great shape cover that I bought from a
>>very nice gentleman named Robert on this list, (thank you again Sir), but
>>the noise was still there. I pulled the cover back off and found that the
>>flex plate, (fly wheel), has started to crack just like the other one did!
>>
>>Any ideas as to the cause of this cracking? The durn thing is coming
>>
>>[/color]
>apart
>
>[color=green]
>>on me again just like the last time two rebuilds ago.
>>
>>Any help and/or ideas would be most appreciated!
>>
>>Best Regards,
>>
>>Ed
>>
>>
>>===Mil-Veh is a member-supported mailing list===
>>To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>>To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
>>To reach a human, contact <ack@mil-veh.org>
>>
>>[/color]
>
>
>
>===Mil-Veh is a member-supported mailing list===
>To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
>To reach a human, contact <ack@mil-veh.org>
>
>
>
>
>[/color]

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Glenn's observation is right on line. Another area that causes problems here
is when the torque converter doesn't seat completely in the back of the
crankshaft. When you install your new flexplate, check to see that the converter can
be slid up flush with it. If there is even a little gap, most people close it
up with the bolts which causes the flexing that Glenn spoke of.
Kenny

In a message dated 7/7/04 9:47:58 AM Eastern Daylight Time, [email]mpmutt@mtaofnj.us[/email]
writes:
[color=blue]
> Hi Derek
> Those flex plates typically last the life of the vehicle. The only
> reason most of them are changed is due to the ring gear being stripped.
> You should be sure that it was installed correctly, and that the
> transmission bellhousing is fully seated to the engine block all
> around. A problem happens if the transmission hangs up on the dowls or
> has some material lodged under the seating edge when it is bolted up.
> If it is not seated exactly right there will be a mis-alignment that
> will flex and fatigue the steel flex plate with every revolution,
> causing it to crack and fail quickly.
> [/color]

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----- Original Message -----
From: "Glenn Shaw" <mpmutt@mtaofnj.us>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Wednesday, July 07, 2004 6:45 AM
Subject: Re: [MV] M-1009 flex plate problems

[color=blue]
> Hi Derek
> Those flex plates typically last the life of the vehicle. The only
> reason most of them are changed is due to the ring gear being stripped.
> You should be sure that it was installed correctly, and that the
> transmission bellhousing is fully seated to the engine block all
> around. A problem happens if the transmission hangs up on the dowls or
> has some material lodged under the seating edge when it is bolted up.
> If it is not seated exactly right there will be a mis-alignment that
> will flex and fatigue the steel flex plate with every revolution,
> causing it to crack and fail quickly.[/color]

I had one truck come back which was making a noise starting and also
periodically impacting the 'flywheel cover' shielding. Turns out that the
engine rebuilder had installed the flex plate backwards. Swell.

A friend had a CUCV pickup that kept developing cracks on the transmission
body itself. He'd replace the transmission with a used spare and, seven
months or so down the road, another body crack developed. Turned out that
the rear removable crossmember/transmission/transfer mount was badly bent,
and was forcing the transmission casing out of alignment causing the cracks
to develop as the only way the casing could relieve the stress. Doubt that
applies in this case though.

It's hard for the CUCV-style flywheel covers to 'bend', I think, as they're
made of cast aluminum. I have all kinds of problems with the thin sheet
steel HMMWV ones though, as they all seem to typically warp and bend and
distort and make intermittent contact with the ring gear almost as a factory
option. Whenever I come across one of those I just tend to pitch it in
favour of a takeoff CUCV-style replacement. I've even seen the sheet-steel
types 'modified' by the USMC mechanics with chunks cut out so they don't
interfere with/contact stuff around the vicinity of the starter. Binned.
<shrug>



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