'43 MB Won't Start (Continued...)

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
Wolfman
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Re: '43 MB Won't Start (Continued...)

Post by Wolfman » Sat May 14, 2022 11:42 am

Sounds like you are on the right track.
Machine shops now days have a machine a block or head is put into to reface the seats. No way one of these machines could be used with the engine in the jeep.
Back in the old days, the valves were removed and a pilot was placed in the guide. Then a stone carrier with the proper stone was placed on the pilot to grind the seat. This could be done with the engine in the jeep. Probably what your new friend has or he may have a carrier with carbide cutters instead of a stone. Either way, the seats can be refurbished in the jeep.
Valves can be refaced on a refacing machine once they are removed.
Be sure he reams the guides to clean them up before starting the process. Don't want a repeat performance.
Hang in there !! Sounds like you are on the way for a jeep ride ! :D
Mike Wolford
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB


tsmgguy
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Re: '43 MB Won't Start (Continued...)

Post by tsmgguy » Mon May 16, 2022 5:49 am

Ok, got the head and accessories off, as well as the left front fender and the exhaust and intake manifolds. Pulling the #3 & #4 intake valves, found that the engine had been assembled 3,800 miles ago with brass intake valve guides instead of steel. The guides were all worn, but the #3 & #4 guides especially so, probably since we had been tapping on the stuck valves with a brass punch. So, new steel guides are going in all around. Valves look great.

Everything else appears to be in really nice shape. The head was especially easy to pull because it is an early one with head bolts instead of studs and nuts. When it was last rebuilt, the engine was apparently given a single light coat of OD paint, so the threads on various bolts did not have a lot of paint build-up on them.

It's going well. We should finish this coming weekend after the arrival of new gaskets and a can of spray-on copper gasket sealant.
Willys MB 236426, Hood 20336549, DOD 5-20-43
Piper L-4A "Grasshopper", Sn. 10371, USAAF 43-29080, DOD 5-28-43

Wolfman
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Re: '43 MB Won't Start (Continued...)

Post by Wolfman » Mon May 16, 2022 6:47 am

I would at least take the valves into a machine shop and have the heads checked on a refacing machine to be sure they are true.
This could be hard to see just by looking at them.
You were beating on them with a brass punch & hammer.
This simple move could save you more grief down the road.
Mike Wolford
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB

tsmgguy
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Re: '43 MB Won't Start (Continued...)

Post by tsmgguy » Thu May 19, 2022 5:49 am

Will do, Mike!
Willys MB 236426, Hood 20336549, DOD 5-20-43
Piper L-4A "Grasshopper", Sn. 10371, USAAF 43-29080, DOD 5-28-43

tsmgguy
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Re: '43 MB Won't Start (Continued...)

Post by tsmgguy » Sat May 21, 2022 5:05 pm

Found that each of the eight valve guides had been lined with what seem to be copper sleeves. They are non-magnetic. Three of these had started to come loose and migrate upwards, causing the valves to stick fast. Each sleeve is about an inch long and is open on one side. Never saw anything like them. New all-steel valve guides fixed the problem.
Attachments
MVC-159S.JPG
MVC-158S.JPG
Willys MB 236426, Hood 20336549, DOD 5-20-43
Piper L-4A "Grasshopper", Sn. 10371, USAAF 43-29080, DOD 5-28-43

Vic ALLAN
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Re: '43 MB Won't Start (Continued...)

Post by Vic ALLAN » Sat May 21, 2022 7:49 pm

Wow ... One never knows what has been done .....would never expect that when guides are readily available...
Thanks for the update
Cheers
1944 mb Eng MB301090 Old Girl
1942 mb 110674 Bruce
1942 mb 131196 WA
GPW 259102 Old Yella
GPW 50962 Henry

Wolfman
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Re: '43 MB Won't Start (Continued...)

Post by Wolfman » Sun May 22, 2022 7:13 am

Replacement bronze guides are common, but they are used mostly on heads & blocks that do not have replaceable guides.
And the replacement bronze guides are not split like the ones in your photo. They are solid. The head or block is reamed to size for the bronze replacement and the guide is pressed into place. Then the guide is reamed to the valve stem size.
???
Looks like Bubba at work to me.
New guides. You did well. Keep up the good work.
Mike Wolford
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB

tsmgguy
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Re: '43 MB Won't Start (Continued...)

Post by tsmgguy » Sun Jun 05, 2022 10:42 am

Smooth as silk!

IMG_5109.zip
(166.45 KiB) Downloaded 29 times
Willys MB 236426, Hood 20336549, DOD 5-20-43
Piper L-4A "Grasshopper", Sn. 10371, USAAF 43-29080, DOD 5-28-43


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