Proper Lifter Adjustment

Top End (cylinders pushrods etc.)
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kfelt
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Proper Lifter Adjustment

#1

Post by kfelt »

Was wondering if anybody can tell me what the threads are on a stock '65 Harley Davidson adjustable push rod? I have stock hydraulic lifters but after market push rods and don't know if the procedure in the manual would apply because of a slightly finer or courser thread difference. Is there a table cross referencing different thread sizes for adjustment or is a half turn up or down really not that critical? Thanks.
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Re: Proper Lifter Adjustment

#2

Post by ingram »

Once you have the threads per inch (TPI) of the push rod, use this formula.

1/TPI = distance for one rotation
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Re: Proper Lifter Adjustment

#3

Post by Gotnoclass »

I guess his question is what's the distance to adjust after zero lash is achieved. I had the same problem, as the parts manual does not specify the TPI count, and the adjustment between stock and some aftermarket lifters are different. 3 complete revolutions Vs. 4 complete revolutions in most cases.

I'm curious if anyone has an answer to that?
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Re: Proper Lifter Adjustment

#4

Post by Larry »

32 TPI. Four full turns preloads the lifter 1/8".
kfelt
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Re: Proper Lifter Adjustment

#5

Post by kfelt »

Seems like compression of the spring (pre load?) 1/8 of an inch is the proper adjustment regardless of the TPI of the push rod. It does say this after reading the manual under "specifications". About half of the total amount of spring travel I would guess. Thanks.
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