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1984 GMC PU rocker arm torque spec
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grayta
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Jul 23, 2009, 3:07 AM
Post #1 of 3
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1984 GMC PU rocker arm torque spec
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I need to know what the rocker arms are supposed to be torqued to. This truck has the 250 ci straight 6 engine. It has been a long time since I have had something this old and if I remember right you are supposed to torque them down and then back the nut off 1/4 turn, or something like that. Any help will be greatly appreciated.
(This post was edited by grayta on Jul 23, 2009, 3:21 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 23, 2009, 4:18 AM
Post #2 of 3
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Re: 1984 GMC PU rocker arm torque spec
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EXC. V6-231
- Start engine and allow to reach normal operating temperature, then shut engine off.
- With engine in position to fire No. 1 cylinder, adjust the following valves: V6-229 and 262, Exhaust Nos. 1, 5 and 6; Intake Nos. 1, 2 and 3. 6-250 and 292, Exhaust Nos. 1, 3 and 5; Intake Nos. 1, 2 and 4. V8 engines, Exhaust Nos. 1, 3, 4 and 8; Intake Nos. 1, 2, 5 and 7. To properly adjust valves, tighten adjusting nut until all lash is eliminated, then tighten nut the specified additional number of turns.
- Turn crankshaft one complete revolution, which will bring engine in position to fire cylinders 4(V6) or 6(Inline 6 and V8). With engine in this position, adjust the following valves: V6-229 and 262, Exhaust Nos. 2, 3 and 4; Intake Nos. 4, 5 and 6. 6-250 and 292, Exhaust Nos. 2, 4 and 6; Intake Nos. 3, 5 and 6. V8 engines, Exhaust Nos. 2, 5, 6 and 7; Intake Nos. 3, 4, 6 and 8.
The following procedure, performed with the engine running should be done only in case readjustment is required.
- After engine has been warmed to operating temperature, remove valve cover and install a new valve cover gasket.
- With engine running at idle speed, back off valve rocker arm nut until rocker arm starts to clatter.
- Turn rocker arm nut down slowly until the clatter just stops. This is the zero lash position.
- Turn nut down 1/4 additional turn and pause 10 seconds until engine runs smoothly. Repeat additional 1/4 turns, pausing 10 seconds each time, until nut has been turned down the specified number of turns from the zero lash position. This preload adjustment must be done slowly to allow the lifter to adjust itself to prevent the possibility of interference between the intake valve head and top of piston, which might result in internal damage and/or bent pushrods. Noisy lifters should be replaced.
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grayta
User
Jul 23, 2009, 4:27 AM
Post #3 of 3
(1826 views)
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Re: 1984 GMC PU rocker arm torque spec
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Thanks.
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