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rocker arm install

This is a discussion on rocker arm install within the Internal Engine forums, part of the LSx Technical Help Section category; I have a 98 trans am and I am replacing the rocker arms since I recently found needle bearings in ...

  1. #1
    never enough ponyslayer's Avatar
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    rocker arm install

    I have a 98 trans am and I am replacing the rocker arms since I recently found needle bearings in the oil. I have read that the crank has to be on tdc and the #1 cylinder has to be closed then 8 rockers have to be torqed down in a certian order rotate the crank and then torqe the the other 8. I have also read that you can just finger tighten them all then torqe them down to 22lbs and be done. Can someone help so I dont wast time for nothing or skip out on something that will cause problems later.

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    here you go

    here
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    Likes twisty roads bene's Avatar
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    Don't make the same mistake as I have using the LS1howto.com.

    Use this method...

    Important
    When using the valve train components again, always install the components to the original location and position.
    Valve lash is net build, no valve adjustment is required.

    Lubricate the valve rocker arms and pushrods with clean engine oil.
    Lubricate the flange of the valve rocker arm bolts with clean engine oil. Lubricate the flange or washer surface of the bolt that will contact the valve rocker arm.
    Install the valve rocker arm pivot support.

    Important
    Ensure that the pushrods seat properly to the valve lifter sockets.

    Install the pushrods.

    Important
    Ensure that the pushrods seat properly to the ends of the rocker arms.
    DO NOT tighten the rocker arm bolts at this time.

    Install the rocker arms and bolts.

    Rotate the crankshaft until number one piston is at top dead center of compression stroke. In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position. If viewing from the rear of the engine, the additional crankshaft pilot hole, non-threaded, will be in the 10:30 position. The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3. Cylinders 1, 3, 5 and 7 are left bank. Cylinders 2, 4, 6, and 8 are right bank.

    Notice
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    With the engine in the number one firing position, tighten the following valve rocker arm bolts: Tighten
    Tighten exhaust valve rocker arm bolts 1, 2, 7, and 8 to 30 Nm (22 lb ft).
    Tighten intake valve rocker arm bolts 1, 3, 4, and 5 to 30 Nm (22 lb ft).
    Rotate the crankshaft 360 degrees.
    Tighten the following valve rocker arm bolts: Tighten
    Tighten exhaust valve rocker arm bolts 3, 4, 5, and 6 to 30 Nm (22 lb ft).
    Tighten intake valve rocker arm bolts 2, 6, 7, and 8 to 30 Nm (22 lb ft).

  4. #4
    never enough ponyslayer's Avatar
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    Quote Originally Posted by bene View Post
    Don't make the same mistake as I have using the LS1howto.com.

    Use this method...
    what does the crankshaft sprocket key look like I cant see anything on the crank pulley to line up and is there a diagram of the cylinder # locations im not sure which cylinder is which other than the #1 is first on the left side(driver side).

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    Likes twisty roads bene's Avatar
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    Quote Originally Posted by ponyslayer View Post
    what does the crankshaft sprocket key look like I cant see anything on the crank pulley to line up and is there a diagram of the cylinder # locations im not sure which cylinder is which other than the #1 is first on the left side(driver side).


    You will not see the crank sprocket because its behind the timing cover. You'll have to know that the #1 piston/cylinder is on TDC when the valves are close.

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    never enough ponyslayer's Avatar
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    thanks thats exactly what I needed.

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    215 heads,ms4cam,102 fast 2000ls1tranz's Avatar
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    hey when i did head an cam intall i put engine to tdc the tightened the rocker bolts to 18lb ....never turn engine over again an re tightened them to check ...do u think it will be ok...please help

  8. #8
    Likes twisty roads bene's Avatar
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    Quote Originally Posted by 2000ls1tranz View Post
    hey when i did head an cam intall i put engine to tdc the tightened the rocker bolts to 18lb ....never turn engine over again an re tightened them to check ...do u think it will be ok...please help
    I would check your rocker arms. It says to torque them @ 22 ft/lbs. It's only going to cost you a few mins of your time vs a few thousand dollars from your account.

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    to OP did you upgrade to compcam trunnion bearings?

  10. #10
    never enough ponyslayer's Avatar
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    no I know I should but money is starting to get tight
    Last edited by ponyslayer; 10-07-2010 at 08:27 AM.

  11. #11
    215 heads,ms4cam,102 fast 2000ls1tranz's Avatar
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    texas speed told me 18lbs using stock rocker arms??????

  12. #12
    never enough ponyslayer's Avatar
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    which is the intake and which is the exhaust rocker? I know the intake is bigger but how will I tell looking from the top of the heads.

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    Likes twisty roads bene's Avatar
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    Quote Originally Posted by ponyslayer View Post
    which is the intake and which is the exhaust rocker? I know the intake is bigger but how will I tell looking from the top of the heads.
    its the left one.

  14. #14
    Likes twisty roads bene's Avatar
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    Quote Originally Posted by 2000ls1tranz View Post
    texas speed told me 18lbs using stock rocker arms??????
    The procedure I posted is GM's. Pick which you trust most.

  15. #15
    never enough ponyslayer's Avatar
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    Finished the install last weekend torqued to 22lbs. runs great and sounds smooth. Thanks for your help bene!

  16. #16
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    Quote Originally Posted by ponyslayer View Post
    Finished the install last weekend torqued to 22lbs. runs great and sounds smooth. Thanks for your help bene!
    No problem.


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