• Welcome to The Truck Stop! We see you haven't REGISTERED yet.

    Your truck knowledge is missing!
    • Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
    • We have tons of knowledge here for your diesel truck!
    • Post your own topics and reply to existing threads to help others out!
    • NO ADS! The site is fully functional and ad free!
    CLICK HERE TO REGISTER!

    Problems registering? Click here to contact us!

    Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!

Lifter preload

Custom Deluxe

Custom Deluxe

New Member
Messages
7
Reaction score
24
Location
Arroyo Grande, ca
Got my Harland rockers mounted, measuring for pushrod length. Bring hydraulic lifters what is a good preload? I was thinking .075”. I have my pushrod length with no preload just need to know how much to add. I measured the plunger on one lifter and was ruffly .200” plunge.
 
DieselAmateur said:
I think I saw @Twisted Steel Performance mention that 0.050" is the preload for measuring length but hopefully he chimes in to clarify.

How are you measuring the pushrod length, just a simple ruler/ tape measure or ? If you're willing to share some info/ pics I've always been curious as to how this process is done
Click to expand...
Yea just using pushrod checker snap gauge style. I just leave the intake and exh rockers on the cylinder I’m checking to make it easier.
Twisted Steel Performance said:
As long as you are using a pushrod length checking rod, add .050" for preload.

And you do know hs rockers use a 5/16 ball pushrod on the rocker end...
Click to expand...
Thank you for responding. Yes the 5/16 on the rocker side. I was thinking of using 5/16 ball on both ends as from what I can tell the lifter cup is 11/32.
 
@Custom Deluxe what do you mean by snap gauge style? I've seen the adjustable pushrods for finding length that just screw/ unscrew for adjustment that are then measured with calipers.

How does the stock length compare to what you've measured for using with the Harland rockers? Are you using the 1.6 non adjustable ratio?
 
DieselAmateur said:
@Custom Deluxe what do you mean by snap gauge style? I've seen the adjustable pushrods for finding length that just screw/ unscrew for adjustment that are then measured with calipers.

How does the stock length compare to what you've measured for using with the Harland rockers? Are you using the 1.6 non adjustable ratio?
Click to expand...
I’m trying to use 1.7 non adjustable with .070 gasket. The length with .050 preload was shorter than stock. It’s not a standard pushrod checker got it from summit works slick. Still use calipers for final measurement.
 
Good point I’ll recheck. Maybe I wasn’t on the base circle or the lifter didn’t drop. The motor looks brand new inside, might have just been rebuilt. It’s a military take out. The heads didn’t seem cut and the piston to deck was stock, unless they used a different pin height piston. At .075” preload would have put me at a stock length pushrod.
 
You must log in or register to reply here.
Back
Top