poly lock question

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poly lock question

Post  cobrakid8 on June 20th 2018, 1:40 pm

Has anyone ever had a poly lock come loose? What I mean is we did the valves set lash to .022 and made one pass, came back and the part inside of the lock was loose and so the rocker was of course loose as it can be. But I have never seen one of them come loose before and I am not sure if i should just buy a new set for my A460's from Jomar or if there could be another problem going on that would cause it to come loose? Also before someone asks, we made the one pass without the jomar stud girdle on the motor, as we were going to come back and check lash again right after the first pass on this new motor. We ran it two more times with the girdle and they never came loose after, but would rather be safe than sorry in case I need new poly locks. Thanks!

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Re: poly lock question

Post  DaveMcLain on June 20th 2018, 2:16 pm

Sometimes when the studs are brand new its possible for that to happen. Once the set screw has been tightened up a few times it will create a "seat" surface and have an easier time staying tight in the future.


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Re: poly lock question

Post  cobrakid8 on June 20th 2018, 2:25 pm

Thanks Dave, that's good to know because I will save that money and instead spend it on something to try and get the car to actually run the entire 1/8 lol. Carb seems to be having a problem.

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Re: poly lock question

Post  jbozzelle on June 20th 2018, 4:26 pm

When using a girdle I don't use the "set screws" in the polylocks. The girdle keeps the adjuster nuts from rotating when tight.

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Re: poly lock question

Post  cobrakid8 on June 20th 2018, 8:25 pm

Thank you both!

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Re: poly lock question

Post  BOSS 429 on June 20th 2018, 10:46 pm

jbozzelle wrote:When using a girdle I don't use the "set screws" in the polylocks.  The girdle keeps the adjuster nuts from rotating when tight.








This is asking for trouble
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Re: poly lock question

Post  pmrphil on June 21st 2018, 8:49 am

Yup, always use the set screws. John at Jomar will tell you that the girdle bars are NOT a failsafe way to prevent the nuts from loosening.

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Re: poly lock question

Post  jbozzelle on June 21st 2018, 9:30 am

Guess I've been doing something wrong all these years...

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Re: poly lock question

Post  DILLIGASDAVE on June 22nd 2018, 4:20 am

Locking down the girdle set screws also removes any thread-slack that might be in each rocker stud/polylock assembly.
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Re: poly lock question

Post  Lem Evans on June 22nd 2018, 12:42 pm

^^^^^^^^
True.

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Re: poly lock question

Post  cobrakid8 on June 22nd 2018, 1:56 pm

hopefully we will get it off the ground and put a different carb to her tonight and get her timed correctly. Just glad that i dont have to buy any new poly locks Laughing

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