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Yesterday, 09:41 PM
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#1 |
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Registered User
Join Date: Jun 2017
Location: Mentor, OH
Posts: 132
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1968 GMC Inline 250 Valve Adjustment
Hi All...
I have a slight clicking/clacking noise so I'm thinking the valves may need adjusted. I found some older posts I've been reading but I saw conflicting information. Some say to tighten the nuts an additional 1/2 half turn after reaching zero lash and some say to tighten 1 full turn. Also, some say to tighten the additional turn with the motor running and some say to tighten after turning to motor off. With that being said, the GM shop manual says to tighten each nut four 1/4 turns, 10 seconds apart (for a total of 1 full turn) while the engine is running. That was back in 1968 so the thinking may have changed. My motor is all original with 55k miles. Looking forward to the advice. |
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Yesterday, 10:02 PM
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#2 |
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Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,384
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Re: 1968 GMC Inline 250 Valve Adjustment
I've always adjusted hydraulic lifters as the manual you cite specified.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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Today, 12:14 AM
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#3 |
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Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,693
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Re: 1968 GMC Inline 250 Valve Adjustment
I've always used the "one turn" method on new lifters and "half turn" on used lifters.. Never had a problem with either method...
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