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Author Topic:   lifter preload
race33
Dirt Full Roller

Total posts: 44
posted March 29, 2004 11:28 AM  
I have seen several differences on how much to preload hydraulic lifters anywhere from 1/4 turn to 1 1/2 turns after you can't turn the pushrod. Any suggestions on this? It would not be for stock lifters.

25JHenry
Dirt Full Roller

Total posts: 73
posted March 29, 2004 11:46 AM  
Tighten them until there is "0" lash between the rocker arm and the valve. Then tighten them 1/2 a turn. I have turned them 3/4 a turn. Both worked well for me. If you are tightening them until the pushrod will not turn then making your final 1/2 or whatever turn you are going way to tight in my opinion. Good Luck.

racer17j
Dirt Forum Champ
Total posts: 5390
posted March 29, 2004 08:04 PM  
The way I've grown up to set pre-load is quite different from most, (I'm old-school).
We'll start with the #1 Cyl..Before you start the engine and warm anything up, remove all the spark plugs, turn the engine over until the intake rocker is all the way open, then set the exhaust side until the pushrod stops twisting in your fingers(dont twist it with force). Do the same with the Exhaust rocker to set the Intake. Do the entire valvetrain. If you find one that worked its way loose after the procedure is complete,(dont touch it), the pressure had forced a little oil out of the lifter,(its OK). Then, fire up the engine, let it warm to 160 to 195 degrees(wherever your thermostat opens), And this will allow the lifters to prime up and become firm again. Have an old valve cover with a slit cut all the way down the center bout 1 1/4 inches wide, that way oil doesnt shoot in your face, and your able to get a 5/8 socket on all the rocker nuts. Now go to each rocker and loosen the nut till you hear a small "tick tick tick" sound. Then, tighten the nut till it disappears. When the "tick" is gone, tighten and extra 1/4 to 3/8 turn. Shut down the engine. Re-install your Valve Covers. And your all set. Hope it helps. If it sounds like I dont know what Im doing, Why havent i ever, In 15 years of engine building, blown one up? Good Luck!

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