So I did a valve adjustment on my 62 Lark with the 170 OHV 6 cyl the other day. Everything went fine, except the "self-locking" adjusting screw on the #1 exhaust was finger-loose. The shop manual says 30 ft-lbs of torque should be felt, and this was true with all of the other adjustment screws...just not that one.
So, I did my valve adjutment, and went on a drive. It ran great for a few miles and then it got to sounding bad (lots of extra chatter). Went home, took the lifter cover off and discovered the suspect adjusting screw had worked itself up into the threads by quite a bit. So, I adjusted again, drove again. Same problem, but even worse this time.
So here I am with a valve adjutment screw that will not stay put. Anyone out there ever had this problem? I'm scratching my head about why this happened and what to do about it. There's no apparent damage. It's incredible to me that these screws keep their place with only friction!?!?
So, I did my valve adjutment, and went on a drive. It ran great for a few miles and then it got to sounding bad (lots of extra chatter). Went home, took the lifter cover off and discovered the suspect adjusting screw had worked itself up into the threads by quite a bit. So, I adjusted again, drove again. Same problem, but even worse this time.
So here I am with a valve adjutment screw that will not stay put. Anyone out there ever had this problem? I'm scratching my head about why this happened and what to do about it. There's no apparent damage. It's incredible to me that these screws keep their place with only friction!?!?
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