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Onan CCK 5.0 compression


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  #1  
Old 10-27-2015, 07:30:25 PM
Surfinhurf Surfinhurf is offline
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Default Onan CCK 5.0 compression

What should it be?

HURF
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Old 10-27-2015, 07:44:23 PM
David C David C is offline
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Default Re: cck 5.0 compression

105psi to 110psi with standard heads and 130psi to 135psi with high compression heads at ~500 cranking rpm per Onan service manual.

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Old 10-28-2015, 09:47:05 AM
Surfinhurf Surfinhurf is offline
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Default Re: Onan CCK 5.0 compression

Thanks, The one I just picked up has 90 to 95. Both sides are equal. I haven't decarbed yet. Should be ok
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Old 10-28-2015, 10:21:43 AM
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Onan Dan Onan Dan is offline
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Default Re: Onan CCK 5.0 compression

Those CCK head gaskets are pretty tough I reuse them if they are no breaks in them clean up everything real nice and follow your service manual for sequence on the head bolts and torque ft lb.
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Old 10-28-2015, 02:44:05 PM
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Default Re: Onan CCK 5.0 compression

I have not seen the high compression psi number ever on my 5.0cck. I have the high compression heads, good valve seal and good ring seal. I see 110-115 @ hot cranking, opposing cylinder plug out. In the 90's with the stepped low compression heads is good.
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