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Thread: Rocker arm replacement

  1. #1
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    Default Rocker arm replacement

    I'm going to change out my original LS1 rockers to the newer style. My question is, I've seen some that pull.
    off the cover and replace them all in one go. Torqed to 22 lbs ft.

    I saw one guys video and he rotated the engine over until each arm was lifted off the spring TDC, then changed that rocker.

    Which is the correct method?

    Thanks!
    Last edited by toolguy; 12-05-2019 at 12:29 PM.

    1998 Six Speed, Torch Red Coupe

  2. #2

    Default

    Hey Todd,

    I always add a drop of engine oil to the tip and the socket for the pushrod to assist in assembly.

    GM recommends the following per document ID: 281433

    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

    The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3.

    Cylinders 1, 3, 5 and 7 are left bank.

    Cylinders2, 4, 6, and 8 are right bank.

    7. With the engine in the number one firing position, tighten the following valve rocker arm bolts:

    ◦Tighten exhaust valve rocker arm bolts 1, 2, 7, and 8 to (22 lb ft).
    ◦Tighten intake valve rocker arm bolts 1, 3, 4, and 5 to (22 lb ft).

     8. Rotate the crankshaft 360 degrees.
     9. Tighten the following valve rocker arm bolts:

    ◦Tighten exhaust valve rocker arm bolts 3, 4, 5, and 6 to (22 lb ft).
    ◦Tighten intake valve rocker arm bolts 2, 6, 7, and 8 to (22 lb ft).

    I know you have the factory service manual, so go with it!!

    Take care, Paul
    GM World Class Certified Service Technician.
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  3. #3
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    Default

    Quote Originally Posted by toolguy View Post
    I'm going to change out my original LS1 rockers to the newer style. My question is, I've seen some that pull.
    off the cover and replace them all in one go. Torqed to 22 lbs ft.

    I saw one guys video and he rotated the engine over until each arm was lifted off the spring TDC, then changed that rocker.

    Which is the correct method?

    Thanks!
    Always with no tension in the valve stem, you do not want to take a chance of bending it.

    Follow Paul's procedure and you will be good. Remember the procedure is on the COMPRESSION stroke, which is often over looked.
    20+ years ASE and Honda Master Tech

    1998 black 6 spd convertible

  4. #4
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    Thanks Paul and Larry! I'll be doing this update in a couple of weeks.

    1998 Six Speed, Torch Red Coupe

  5. #5
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    Default

    In the middle of this job now and can't get the engine to rotate. All the plugs are loose but I guess I can't get enough leverage with my 24 mm wrench. A socket is useless because the rack is in the way.
    Going to try and find a 24 mm off set wrench.

    1998 Six Speed, Torch Red Coupe

  6. #6
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    Probably a dumb question but: is the car in neutral?
    2015 Stingray Z51 w/ Magnetic Ride Control & 8-speed Automatic


  7. #7
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    Quote Originally Posted by Poltergeist View Post
    Probably a dumb question but: is the car in neutral?

    Not a dumb question, could easily be the issue.

    It is a tough place to get any leverage.
    20+ years ASE and Honda Master Tech

    1998 black 6 spd convertible

  8. #8
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    Quote Originally Posted by Poltergeist View Post
    Probably a dumb question but: is the car in neutral?
    OMG Rob! No, the car is not in neutral!
    LOL! I'm working on it while it's in storage, in gear and battery out.
    I just totally forgot! I did purchase a off set wrench which will make it easier to turn the crank pulley but it's not yet yet.

    1998 Six Speed, Torch Red Coupe

  9. #9
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    Got my off set wrench and will finish the job tomorrow.
    None of my old rockers had lost their bearings.

    1998 Six Speed, Torch Red Coupe

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