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Flathead-6 Valve Adjustment

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markussstill
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Joined: Wed Aug 15, 2007 12:09 pm

Flathead-6 Valve Adjustment

Post by markussstill » Sun May 29, 2016 11:17 pm

Hey guys, can anyone supply me a step-by-step procedure for adjusting the valves on a Chris Craft 95-HP "K"motor? I've got a valve that sticks open when the operating temp rises above 140F (momentary peak when powering-down to idle), causing the engine to idle very radically (usually dies). Help!....

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tkhersom
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Location: Edgecomb, Maine

Re: Flathead-6 Valve Adjustment

Post by tkhersom » Mon May 30, 2016 9:03 pm

I don't know the procedure, but am concerned that adjustment will not fix a sticking valve. Is it possible that there is a bigger problem?

I think I would add some marvel oil to my fuel and maybe even my crank case oil, along with doing the valve adjustment.

Are you using oil with ZDDP?

I am curious to see what others suggest.
Troy in ANE - President CCABC

1957 CC 21' Continental "Yorktown" (Mom's boat)
https://www.chris-craft.org/boats/22625/
1958 CC 38' Connie "American Beauty"
https://www.chris-craft.org/boats/22607/
1985 Formula 242LS "Gottago"
1991 Formula 36PC "Band Aids"

Life Is Too Short To Own An Ugly Boat

jim g
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Joined: Wed Dec 14, 2011 10:55 pm

Re: Flathead-6 Valve Adjustment

Post by jim g » Mon May 30, 2016 9:22 pm

Has then engine been rebuilt recently?

Captain Nemo
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Location: Lyons, NY

Re: Flathead-6 Valve Adjustment

Post by Captain Nemo » Mon May 30, 2016 9:28 pm

I have to agree w/ Troy. This could indicate a problem. Has this motor been sitting for a while?. These K's are notorious for the valves sticking after storage. The MM oil may help loosen things up.
Boats are to be made of wood, otherwise, God would have grown fiberglass trees.

joanroy
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Joined: Sun Jan 29, 2012 1:46 pm

Re: Flathead-6 Valve Adjustment

Post by joanroy » Tue May 31, 2016 4:35 pm

How do you know it's a stuck valve?

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tkhersom
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Joined: Wed Feb 27, 2013 6:56 pm
Location: Edgecomb, Maine

Re: Flathead-6 Valve Adjustment

Post by tkhersom » Tue May 31, 2016 4:46 pm

joanroy wrote:How do you know it's a stuck valve?
You always have such good questions. :D
Troy in ANE - President CCABC

1957 CC 21' Continental "Yorktown" (Mom's boat)
https://www.chris-craft.org/boats/22625/
1958 CC 38' Connie "American Beauty"
https://www.chris-craft.org/boats/22607/
1985 Formula 242LS "Gottago"
1991 Formula 36PC "Band Aids"

Life Is Too Short To Own An Ugly Boat

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