TQ'ing down rocker arms.....correct way?
06-10-2009, 07:16 AM
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TQ'ing down rocker arms.....correct way? what is the correct way to bolt down the rocker arms? I see some jsut TQ to 22 and go on. Some say to have the valve closed. Which is best and why?
I am thinking of getting some Harlan Sharp or YT roller rockers for my L92's
I am thinking of getting some Harlan Sharp or YT roller rockers for my L92's
06-10-2009, 02:50 PM
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I have the Harlan Sharp rollers for the LS1. They work really well, But I've broken a couple rocker arm bolts becasue I torqued some of them when they were opening the valve.
You have to torque the bolts then turn the engine 180* and torque them again.
You have to torque the bolts then turn the engine 180* and torque them again.
06-30-2009, 05:15 AM
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yes, the valve needs to be fully closed otherwise you won't be putting the proper torque on the bolts. you also have to make sure that the bolts torque to 22 ft lbs within a certain radial distance. give me a second and i'll post the directions for the harland sharp roller rockers.
06-30-2009, 05:19 AM
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Direct from Harland Sharp install sheet. If you want, pm me your email and i'll send you the full pdf version.
1. Disconnect negative battery cable.
2. Remove coil packs and valve covers may be easier if you remove
the spark plugs as well.
3. With an 8 mm socket remove the stock rockers completely you will not need any
of the old parts.
4. Place one cylinder on Top Dead Center
5. Check preload on that cylinder
6. From zero lash you should be between ¾ and 1 ½ turns till 22ft.lbs. of tq
(may require shims or different length pushrod to get it correct.)
7. Once the preload is determined install the rest of the rockers and tq. To 22ft.lbs.
(this does not need to be in any particular order just be sure to tighten the two
rockers evenly.)
8. Once rockers are installed be sure to check for clearance around cylinder head
and valve cover, Due to minor variations in casting and machine processes rocker
may need additional clearance. ( 97-98 perimeter bolt heads may require more
additional clearance.)
9. Reinstall valve cover, coil packs and spark plugs if removed.
10. Reinstall the negative battery cable.
11. Start the car let it warm up and enjoy.
1. Disconnect negative battery cable.
2. Remove coil packs and valve covers may be easier if you remove
the spark plugs as well.
3. With an 8 mm socket remove the stock rockers completely you will not need any
of the old parts.
4. Place one cylinder on Top Dead Center
5. Check preload on that cylinder
6. From zero lash you should be between ¾ and 1 ½ turns till 22ft.lbs. of tq
(may require shims or different length pushrod to get it correct.)
7. Once the preload is determined install the rest of the rockers and tq. To 22ft.lbs.
(this does not need to be in any particular order just be sure to tighten the two
rockers evenly.)
8. Once rockers are installed be sure to check for clearance around cylinder head
and valve cover, Due to minor variations in casting and machine processes rocker
may need additional clearance. ( 97-98 perimeter bolt heads may require more
additional clearance.)
9. Reinstall valve cover, coil packs and spark plugs if removed.
10. Reinstall the negative battery cable.
11. Start the car let it warm up and enjoy.
07-12-2009, 01:52 PM
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I was advised by a competent mechanic who has done hundreds of them that all you have to do is torque them down. He said "If you take your time and don't over torque then and you'll be just fine." He was right.
