Re: [MV] Mystery Manifold Troubles........M151A2 Mutt

Ken,
I've seen this problem before. It was a stuck valve in my case. Pull the
valve cover and look to see if all of the exhaust valves are closing all the
way. One of them is probably misadjusted or intermittently sticking. If it
does not close all the way, burning fuel goes out the manifold causing it to
get cherry red. I know you said the compression is good, but take a look
anyway.
Be werry werry careful.
-Sarge

----- Original Message -----
From: <Muttguru (AT) aol (DOT) com>
To: "Military Vehicles Mailing List" <mil-veh (AT) mil-veh (DOT) org>
Sent: Saturday, December 31, 2005 1:54 PM
Subject: Re: [MV] Mystery Manifold Troubles........M151A2 Mutt

[color=blue]
> Dear Listers,
>
> Advice needed:-Vehicle - M151A2 owned by colleague.
>
> Problem: - exhaust manifold gets red hot near the junction with the[/color]
down-pipe[color=blue]
> - almost immediately the engine runs.
>
> Checked so far:-
> Compression - within specs
> Timing - spot-on
> Air/Fuel Mixture - correct
> Exhaust system - no crush damage, no leaks, no restrictions, no blockages
> evident.
> Fuel - regular gas, no admixtures or additives.
> Plugs are mil-spec in good shape.
> No air leaks or damaged gaskets at carb or inlet / exhaust manifolds.
>
> Possible causes:-
> Manifold not of correct-grade steel (unlikely - but will try different[/color]
one)[color=blue]
> Restriction inside manifold near exhaust-flange junction (maybe bolt etc
> wedged in place) - will check when removed.
> Internal failure of one or both mufflers (but no signs of this).
>
> If anyone has further suggestions, they will really be appreciated. Will
> report back when this mystery is solved.
>
> thanks in advance & Happy New Year to all.
> Ken
>
> ===Mil-Veh is a member-supported mailing list===
> To unsubscribe, send e-mail to <mil-veh-off (AT) mil-veh (DOT) org>
> To reach a human, contact <ackyle (AT) gmail (DOT) com>
> Visit the searchable archives at [url]http://www.mil-veh.org/archives/[/url]
>
>[/color]



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Dear Listers,

Advice needed:-Vehicle - M151A2 owned by colleague.

Problem: - exhaust manifold gets red hot near the junction with the down-pipe
- almost immediately the engine runs.

Checked so far:-
Compression - within specs
Timing - spot-on
Air/Fuel Mixture - correct
Exhaust system - no crush damage, no leaks, no restrictions, no blockages
evident.
Fuel - regular gas, no admixtures or additives.
Plugs are mil-spec in good shape.
No air leaks or damaged gaskets at carb or inlet / exhaust manifolds.

Possible causes:-
Manifold not of correct-grade steel (unlikely - but will try different one)
Restriction inside manifold near exhaust-flange junction (maybe bolt etc
wedged in place) - will check when removed.
Internal failure of one or both mufflers (but no signs of this).

If anyone has further suggestions, they will really be appreciated. Will
report back when this mystery is solved.

thanks in advance & Happy New Year to all.
Ken

===Mil-Veh is a member-supported mailing list===
To unsubscribe, send e-mail to <mil-veh-off (AT) mil-veh (DOT) org>
To reach a human, contact <ackyle (AT) gmail (DOT) com>
Visit the searchable archives at [url]http://www.mil-veh.org/archives/[/url]

Ken,
My first thought is the little furry 4 legged creature has made his home in
the muffler......that would be the restriction, and the holding of heat as
it exits the manifold......

Anyone else?



SSGT SMITH CN
USMC MITT, 1ST BN, 3RD BDE, 7TH DIV
NUMANIYAH
APO AE 09331

M880, M274A5, 6K GenSet





From: [email]Muttguru (AT) aol (DOT) com[/email]
To: "Military Vehicles Mailing List" <mil-veh (AT) mil-veh (DOT) org>
Subject: Re: [MV] Mystery Manifold Troubles........M151A2 Mutt
Date: Sat, 31 Dec 2005 14:54:00 EST

Dear Listers,

Advice needed:-Vehicle - M151A2 owned by colleague.

Problem: - exhaust manifold gets red hot near the junction with the
down-pipe
- almost immediately the engine runs.

Checked so far:-
Compression - within specs
Timing - spot-on
Air/Fuel Mixture - correct
Exhaust system - no crush damage, no leaks, no restrictions, no blockages
evident.
Fuel - regular gas, no admixtures or additives.
Plugs are mil-spec in good shape.
No air leaks or damaged gaskets at carb or inlet / exhaust manifolds.

Possible causes:-
Manifold not of correct-grade steel (unlikely - but will try different one)
Restriction inside manifold near exhaust-flange junction (maybe bolt etc
wedged in place) - will check when removed.
Internal failure of one or both mufflers (but no signs of this).

If anyone has further suggestions, they will really be appreciated. Will
report back when this mystery is solved.

thanks in advance & Happy New Year to all.
Ken

===Mil-Veh is a member-supported mailing list===
To unsubscribe, send e-mail to <mil-veh-off (AT) mil-veh (DOT) org>
To reach a human, contact <ackyle (AT) gmail (DOT) com>
Visit the searchable archives at [url]http://www.mil-veh.org/archives/[/url]



===Mil-Veh is a member-supported mailing list===
To unsubscribe, send e-mail to <mil-veh-off (AT) mil-veh (DOT) org>
To reach a human, contact <ackyle (AT) gmail (DOT) com>
Visit the searchable archives at [url]http://www.mil-veh.org/archives/[/url]

Ken,
I've seen this problem before. It was a stuck valve in my case. Pull the
valve cover and look to see if all of the exhaust valves are closing all the
way. One of them is probably misadjusted or intermittently sticking. If it
does not close all the way, burning fuel goes out the manifold causing it to
get cherry red. I know you said the compression is good, but take a look
anyway.
Be werry werry careful.
-Sarge

----- Original Message -----
From: <Muttguru (AT) aol (DOT) com>
To: "Military Vehicles Mailing List" <mil-veh (AT) mil-veh (DOT) org>
Sent: Saturday, December 31, 2005 1:54 PM
Subject: Re: [MV] Mystery Manifold Troubles........M151A2 Mutt

[color=blue]
> Dear Listers,
>
> Advice needed:-Vehicle - M151A2 owned by colleague.
>
> Problem: - exhaust manifold gets red hot near the junction with the[/color]
down-pipe[color=blue]
> - almost immediately the engine runs.
>
> Checked so far:-
> Compression - within specs
> Timing - spot-on
> Air/Fuel Mixture - correct
> Exhaust system - no crush damage, no leaks, no restrictions, no blockages
> evident.
> Fuel - regular gas, no admixtures or additives.
> Plugs are mil-spec in good shape.
> No air leaks or damaged gaskets at carb or inlet / exhaust manifolds.
>
> Possible causes:-
> Manifold not of correct-grade steel (unlikely - but will try different[/color]
one)[color=blue]
> Restriction inside manifold near exhaust-flange junction (maybe bolt etc
> wedged in place) - will check when removed.
> Internal failure of one or both mufflers (but no signs of this).
>
> If anyone has further suggestions, they will really be appreciated. Will
> report back when this mystery is solved.
>
> thanks in advance & Happy New Year to all.
> Ken
>
> ===Mil-Veh is a member-supported mailing list===
> To unsubscribe, send e-mail to <mil-veh-off (AT) mil-veh (DOT) org>
> To reach a human, contact <ackyle (AT) gmail (DOT) com>
> Visit the searchable archives at [url]http://www.mil-veh.org/archives/[/url]
>
>[/color]



===Mil-Veh is a member-supported mailing list===
To unsubscribe, send e-mail to <mil-veh-off (AT) mil-veh (DOT) org>
To reach a human, contact <ackyle (AT) gmail (DOT) com>
Visit the searchable archives at [url]http://www.mil-veh.org/archives/[/url]