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Re: Rocker arm adjustment
[Re: JeffL]
#1477310
08/01/13 12:50 AM
08/01/13 12:50 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I move the pushrod up & down with my thumb/forefinger & get to zero end play: then with a feeler gauge set the gap if it's a solid lifter cam & you'd want to see what the particular cam mfr wants (with iron (I'm assuming) block/alum heads) & the cam mfr may or may not have a cold lash spec that'd be different from the hot lash spec. On a hyd cam (from zero play) you'd do the opposite & lengthen the pushrod or adj rockers till you have .020-.030" preload (again ask the cam mfr) by turning the rocker arm screws ~1/2-3/4 of a turn clockwise (depends on the # of threads per inch on Crane gold rocker arm adj screws. there's a chart to adj the valves either four of em at a time with the 4 position chart or 2 of em at a time with the 8 position chart but I prefer before I install the intake is to get each cyl on TDC & adj its' pair of rocker arms then with them all adjusted take off the rocker shafts/arms pushrods/lifters & goop the cam lobes/lifter bottoms then replace the removed items & the adjustments will not change just from a carefull R&R & this avoids hand turning wiping breakin lube off of the lobes. A bit picky but all I hear about is cam failures so I try to be proactive & it actually takes less time than the other methods as you get each piston easily/quickly to TDC (watching the dist rotor is an easy way for all other than #1 & #6) & adj that pair of rockers.
live every 24 hour block of time like it's your last day on earth
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Re: Rocker arm adjustment
[Re: JeffL]
#1477313
08/01/13 03:15 PM
08/01/13 03:15 PM
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Joined: Aug 2003
Posts: 43,335
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,335
Bend,OR USA
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Quote:
Hughes hydrolic cam 500 lift 300 dur. not exact specs, I will look them up.
Warm the motor up so the oil is hot and then adjust one side at a time by rotating the motor over so the exhaust valve just starts to open, then set the intake rocker arm by backing off the adjutster so you get free play between the adjuster end and the pushrod cup, slowly tighten the adjuster up while feeling the pushrod with your hand while spinnng the pushrod, once it start to get a tiny bit of tension on it tighten the adjuster up between 1/3 and 1/2 a turn of the adjuster and hold the adjuster still while tightening the lock nut   Once the intake is set then rotate the motor over clockwise until the intake valve opens all the way and start to cloes, then set the exhaust adjustment the same way Do one cylinder at a time and once you have one side set button that side up and run the motor again to warm the motor back up before doing the other side, it helps to have a remote starter button or someone in the car to bump the starter over, leave the spark plugs in the motor if your going to use the starter Good luck, take your time and get them set correctly This method is a litle harder than using the Chevy and Mopar valve lash chart methods but it is a lot more accuurate on the bigger cams 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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