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73 Q Code Rocker Arm Reinstallation?


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I changed out my valve seals. Before I retorque the rockers (positive stop, non adjustable), I started thinking about the procedure to do it properly. I keep thinking about the pre load on the lifters and making sure that I tighten them down in proper sequence. It has been 20+ years since I last did this. I do have the factory manuals to go by as well, but wanted an additional opinion from those that have done this with the heads still on the car. I believe the torque setting is 20 ft/lbs. Can someone that has experience confirm the procedure for me, please and thanks. 

"Yes dear", has kept me in the hobby a long time...

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Typically when I set lash I set the intake when the exhaust valve begins to open and set the exhaust when the intake is just after max lift. This ensures the lifters are on the base circle when set. I do 1 cylinder at a time. To me it's simpler than finding TDC. 

 

[align=left]Jeff T.

 

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passengers. [/align]

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Hydraulic lifters? Put piston at TDC and torque down both rockers for that cylinder. Repeat 7 more times 

 

 

 

 

 

Edited by Gold Rush
Add info

Rick, not Rich or Dick or Richard

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5 hours ago, droptop73 said:

Typically when I set lash I set the intake when the exhaust valve begins to open and set the exhaust when the intake is just after max lift. This ensures the lifters are on the base circle when set. I do 1 cylinder at a time. To me it's simpler than finding TDC. 

 

Hmmm. Maybe I wasn't clear. They are hydraulic lifters (original), positive stop pedestals. Sorry about that.

"Yes dear", has kept me in the hobby a long time...

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No, you were clear no need to apologize.

If you want to tighten them in sequence the method works for solid or hydraulic lifters. With fixed hydraulics tighten the bolt to the service spec. With adjustable hydraulics tighten until you feel the slop go out of the pushrod and then tighten another 1/2 turn. I included the video as it illustrates the lash sequence that will work for any engine. With the fixed pedestals it's a bunch of extra work to go through the sequence in my opinion. 

[align=left]Jeff T.

 

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passengers. [/align]

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16 hours ago, Gold Rush said:

Hydraulic lifters? Put piston at TDC and torque down both rockers for that cylinder. Repeat 7 more times 

 

 

 

 

 

For non adjustable that'll work fine but with adjustable if someone were to have them it HAS to be TDC compression or the lash will be set on the cam overlap. 

[align=left]Jeff T.

 

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passengers. [/align]

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7 minutes ago, droptop73 said:

No, you were clear no need to apologize.

If you want to tighten them in sequence the method works for solid or hydraulic lifters. With fixed hydraulics tighten the bolt to the service spec. With adjustable hydraulics tighten until you feel the slop go out of the pushrod and then tighten another 1/2 turn. I included the video as it illustrates the lash sequence that will work for any engine. With the fixed pedestals it's a bunch of extra work to go through the sequence in my opinion. 

Fair enough. That’s what I figured. The factory manual also goes through the sequence similar to your comments. I was aware of the adjustable lifter requirements as I have previously

 

16 hours ago, Gold Rush said:

Hydraulic lifters? Put piston at TDC and torque down both rockers for that cylinder. Repeat 7 more times 

 

 

 

 

 

done the procedure exactly as you describe. Better safe then sorry....

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"Yes dear", has kept me in the hobby a long time...

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7173vert, once I get to zero lash (with positive stop) I will put my ratchet handle to a  clock position and then count how far it goes before the bolt starts reaching torque, (that will tell you how much preload you actually have. 

If over 1 full turn, will usually add one of the little Crane rocker shims, thinner of the two that usually come in a standard pack.

Boilermaster

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