leaking rad fluid through head studs

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
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Gary Turman
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leaking rad fluid through head studs

Post by Gary Turman » Sat Jan 14, 2017 5:25 am

Just finished a rebuild. Having about three studs leaking radiator fluid while the engine is running. I put sealant on each when I installed the studs. Am I missing something or did I put the wrong sealant? I used gasket sealant.
1941 Dodge WC-7 Command Car
1942 Ford GPW
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1967 M416
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Joe Gopan
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Re: leaking rad fluid through head studs

Post by Joe Gopan » Sat Jan 14, 2017 5:37 am

Gasket sealant such as Permatex #3 (Liquid), Permatex #2 (Non hardening) on the lower thread should be effective and durable, it is what the factory did. The studs should be just snugged into the block, not torqued Perhaps an few hours running time will help. Retorque the head upon initial warm up..
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Re: leaking rad fluid through head studs

Post by Wolfman » Sat Jan 14, 2017 5:42 am

I use Permatex White Teflon thread sealing paste. Comes in a bottles with a brush like Permatex Aviation gasket sealer.
Far better than Teflon tape.
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Re: leaking rad fluid through head studs

Post by Ralph » Sat Jan 14, 2017 8:45 am

Gary,
My rebuild did the same thing.After a few-maybe 8-10- heat/cool cycles and a re-torque they all stopped their weeping.Pretty average for these engines.
Ralph

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tamnalan
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Re: leaking rad fluid through head studs

Post by tamnalan » Sat Jan 14, 2017 9:16 am

Agree with the others. GIve it a while before taking anything apart. It may soon stop on its own.
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Re: leaking rad fluid through head studs

Post by dpcd67 » Sat Jan 14, 2017 10:51 am

Using anything but Permatex #2 on studs or head bolts is a leak waiting to happen. No need for anything else.
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twinflyer17
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Re: leaking rad fluid through head studs

Post by twinflyer17 » Sat Jan 14, 2017 8:57 pm

Wolfman wrote:I use Permatex White Teflon thread sealing paste. Comes in a bottles with a brush like Permatex Aviation gasket sealer.
Far better than Teflon tape.
Ditto. Mine has worked like a charm.
Sean

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Gary Turman
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Re: leaking rad fluid through head studs

Post by Gary Turman » Sun Jan 15, 2017 7:06 pm

Thanks for the help. I did run it for a total of about two hours and several studs kept leaking. Turns out I have to replace the head anyways. The machine shop missed a crack in it. Fortunately I have another one, just hope it's in good condition.
1941 Dodge WC-7 Command Car
1942 Ford GPW
1968 M151-A1
1967 M416
1945 Gemco 1/4 ton trailer
US Army 1979-1984
Houston Police Officer 1984-2016 (Retired)

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Re: leaking rad fluid through head studs

Post by Joe Gopan » Mon Jan 16, 2017 3:53 am

Makes more sense now.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO


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