Question about 1997 GMC Sierra

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We've installed new head, intake and exhaust gaskets, yet there is 0 compression in either head. Think we have the rocker arm nuts cranked down to to tightly. How do we properly adjust these?

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  • dysone355 Jul 14, 2009

    Ok I assumed that. Do you think this could be the problem though? I mean the compression gauge is flatlined - nothing. I can hear escaping from the intake manifold though. Also, do you know if this is an interference engine? The mechanical timing of the engine was never altered as the timing chain was never removed. Could I have damaged the engine by tightening all of the rocker arm bolts all the way down?

  • dysone355 Jul 14, 2009

    Ok I assumed that. Do you think this could be the problem though? I mean the compression gauge is flatlined - nothing. I can hear escaping from the intake manifold though. Also, do you know if this is an interference engine? The mechanical timing of the engine was never altered as the timing chain was never removed. Could I have damaged the engine by tightening all of the rocker arm bolts all the way down?

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Hello dysone...Is this a 5.7 litre engine?...Why were the heads replaced on this engine? Did it overheat and crack one..or blow a head gasket? Were BOTH heads replaced, or just one? How many miles does the engine have on it? Yes, you could have damaged some valve train componets if you over-tightened the rockers. Possible bent pushrods, collapsed lifters, or even bent a valve.
Did you check the engine block for warpage..was the deck straight and true?
Were the new heads properly torqued when installed? Did you reuse the old head bolts or replace them? Many factors to consider here...If you can tell me a little more i may be able to provide you with more answers.
Good luck...i hope this helps.

Posted on Jul 18, 2009

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To properly adjust, refer to the vehicles maintenance manual.

Posted on Jul 14, 2009

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1 Answer

Blown Head Gasket repair - How do I set the valves correctly? DO I need to turn the crank shaft or just tighten to remove LASH?


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How to install rocker arms on a Pontiac grand am 2001 V-6


Hi there:

Rocker Arms & Pushrods


Removal & Installation

3.1L & 3.4L Engines
Left Side

  1. Before servicing the vehicle, refer to the precautions section.
  2. Drain the cooling system to a level below the coolant pipe on the front of the engine.
  3. Remove or disconnect the following:
    NOTEKeep the pushrods in order. Intake pushrods are 5 3 / 4 inches long and exhaust pushrods are 6 inches long.


    Negative battery cableSpark plug wiresHeater bypass pipePositive Crankcase Ventilation (PCV) valve and hoseRocker arm cover


    Rocker arms and pushrods

To install:

  1. Lubricate all the valvetrain components with engine oil.
  2. Install or connect the following:

    Pushrods and the rocker arms. Torque the bolts to 24 ft. lbs. (32 Nm).Rocker arm cover using a new gasket. Torque the rocker cover bolts to 89 inch lbs. (10 Nm).PCV valve and hoseHeater bypass pipe. Torque the screw at the water pump to 106 inch lbs. (12 Nm), the bolt at the cylinder head corner to 18 ft. lbs. (25 Nm) and the nut to 18 ft. lbs. (25 Nm).Spark plug wiresNegative battery cable
  3. Refill the cooling system.
  4. Start the vehicle and verify no leaks.




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Right Side
  1. Before servicing the vehicle, refer to the precautions section.
  2. Remove or disconnect the following:
    NOTEKeep the pushrods in order. Intake pushrods are 5 3 / 4 inches long and exhaust pushrods are 6 inches long.


    Negative battery cableAlternator bracket on 2005 modelsSpark plug wires from the spark plugs and the upper intake plenum wire retainerPower brake booster vacuum pipe from the intake plenumAccessory drive beltAlternator, if necessaryIgnition coil assembly and Evaporative Emissions (EVAP) canister purge solenoid as an assemblyRocker arm cover


    Rocker arms and pushrods

To install:

  1. Lubricate all the valvetrain components with engine oil.
  2. Install or connect the following:

    Pushrods and the rocker arms. Torque the bolts to 24 ft. lbs. (32 Nm) plus an additional 30 degree turn.Rocker arm cover using a new gasket. Torque the rocker cover bolts to 89 inch lbs. (10 Nm).Ignition coil and EVAP solenoid assemblyAlternator, if removed. Torque the bolts to 37 ft. lbs. (50 Nm).Accessory drive beltPower brake booster vacuum pipe to the plenumSpark plug wiresNegative battery cable
  3. Start the vehicle and verify no leaks.





Hope this helps.

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Do I have to take the timming belt off to do a head gasket on a 1999 chevy malibu v6 3.1L


The 3.1 engine does not have a belt,it is a chain motor.You do not need to remove timing chain to remove head.

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Need head bolt torqe for 3100 and should bolts be dry


The bolts should have thread lock on them when installing, and the torque is done in 2 steps. 33 ft lbs. and then 90 deg. after that on the second pass. 3.1L Engine CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion. LEFT SIDE (FRONT)
  1. Properly relieve the fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Drain the cooling system into a suitable container.
  4. Disconnect the top half of the air cleaner assembly, then remove the throttle body air inlet duct.
  5. Remove the exhaust crossover pipe heat shield and crossover pipe.
  6. Disconnect the spark plug wires from spark plugs and looms then route the wires out of the way.
  7. Remove the rocker arm (valve) covers.
  8. Remove upper intake plenum and lower intake manifold.
  9. Remove the left side exhaust manifold.
  10. Remove oil level indicator tube. NOTE: When removing the valve train components they must be kept in order for installation in the same locations they were removed from.
  11. Remove rocker arms nut, rocker arms, balls and pushrods.
  12. Unfasten the cylinder head bolts evenly, then remove the cylinder head from the engine compartment. Remove and discard the gasket. To install:
  13. Clean all the gasket surfaces completely. Clean the threads on the cylinder head bolts and block threads.
  14. Place the cylinder head gasket in position over the dowel pins on the cylinder block so the words THIS SIDE UP are showing.
  15. Coat the bolt threads lightly with sealer, then install finger-tight.
  16. Tighten the cylinder head bolts in sequence to 33 ft. lbs. (45 Nm). With all the bolts tightened make a second pass tightening all the bolts an additional 90°.
  17. Install the pushrods, rocker arms, balls and rocker arm nuts in their proper locations. Tighten the rocker arm nuts to 18 ft. lbs. (25 Nm).
  18. Install the lower intake manifold and upper intake plenum.
  19. Install the rocker arm (valve) covers.
  20. Install the oil level indicator tube. Insert the dipstick.
  21. Connect the spark plug wires to spark plugs and looms.
  22. Install the left side exhaust manifold.
  23. Install the exhaust crossover pipe and heat shield.
  24. Refill the cooling system.
  25. Install the top half of the air cleaner assembly and the throttle body air inlet duct.
  26. Connect negative battery cable.
  27. Start vehicle and verify that there are no leaks. Fig. 20: Cylinder head mounting and bolt tightening sequence - 3.1L engine 86883134.gif
RIGHT CYLINDER HEAD (REAR) CAUTION
Fuel Injection systems remain under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.
  1. Relieve the fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Drain the cooling system.
  4. Remove the top half of the air cleaner assembly and remove the throttle body air inlet duct.
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  17. Place the cylinder head gasket in position over the dowel pins on the cylinder block so the words THIS SIDE UP showing.
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  21. Install the lower intake manifold and upper intake plenum.
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  26. Connect the exhaust pipe to the exhaust manifold.
  27. Carefully lower the vehicle.
  28. Connect the Oxygen (O2) sensor wiring.
  29. Install the exhaust crossover pipe and heat shield.
  30. Refill the cooling system.
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  32. Connect negative battery cable.
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1 Answer

Need cylinder head torque specifications 2004 hyundai elantra


Install the cylinder head bolts. Starting at top center, tighten all cylinder head bolts in sequence as shown in illustration, using the Cylinder Head Bolt Wrench (09221 - 32001) or equivalent. Repeat the procedure, re-tightening all cylinder head bolt to the specified torque. (torque spec is Cold Engine 105-115 Nm (76-83 ft lb) )
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. Install the timing belt on the camshaft sprocket, making sure that the tension side is tightened by turning the camshaft sprocket in reverse, all timing marks are in alignment.
. Adjust the timing according to "Timing Belt"
. Install the rocker cover and tighten the bolts to the specified torque. Tightening torque: Rocker cover belt:

2.5-3.5 Nm (25-35 kg.cm, 2-3 ft. lbs.)

. Install the timing belt cover.
Install the new intake manifold gasket and the intake manifold. Tighten the nuts and bolts to the specified torque.
Install the new exhaust manifold gasket and the exhaust manifold. Tighten the exhaust manifold attaching nuts to the specified torque.
. Install the surge tank and tighten the nuts bolts to the specified torque.
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1 Answer

Rocker arm torque specs on a 97 gmc jimmy 4.3


  1. For the 4.3L engines which are equipped with screw-in type rocker arm studs with positive stop shoulders, tighten the rocker arm adjusting nuts against the stop shoulders to 20 ft. lbs. (27 Nm) on 1994-96 models and 18 ft. lbs. (25 Nm) on 1997-99 models. No further adjustment is necessary, or possible.
  2. For most 4.3L engines which are not equipped with screw-in type rocker arm studs and positive stop shoulders, properly adjust the valve lash. For details on valve lash adjustment, please refer to the procedure in Routine Maintenance . (see below)
4.3L Engine

The 4.3L engines may be equipped with either of 2 rocker arm retaining systems. If your engine utilizes screw-in type rocker arm studs with positive stop shoulders, no valve lash adjustment is necessary or possible. If however, you engine utilizes the pressed-in rocker arm studs, use the following procedure to tighten the rocker arm nuts and properly center the pushrod on the hydraulic lifter:
  1. To prepare the engine for valve adjustment, rotate the crankshaft until the mark on the damper pulley aligns with the 0? mark on the timing plate and the No. 1 cylinder is on the compression stroke. You will know when the No. 1 piston is on it's compression stroke because both the intake and exhaust valves will remain closed as the crankshaft damper mark approaches the timing scale.

Another method to tell when the piston is coming up on the compression stroke is by removing the spark plug and placing your thumb over the hole, you will feel the air being forced out of the spark plug hole. Stop turning the crankshaft when the TDC timing mark on the crankshaft pulley is directly aligned with the timing mark pointer or the zero mark on the scale.
The valve arrangement is as follows:



E-I-I-E-I-E (right bank-front-to-rear) E-I-E-I-I-E (left bank-front-to-rear)

  1. With the engine on the compression stroke, adjust the exhaust valves of cylinders No. 1, 5 & 6 and the intake valves of cylinders No. 1, 2 & 3 by performing the following procedures:
    1. Back out the adjusting nut until lash can be felt at the pushrod.
    2. While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
    3. When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turns.

  2. Rotate the crankshaft one complete revolution and align the mark on the damper pulley with the 0? mark on the timing plate; the engine is now positioned on the No. 4 firing position. This time the No. 4 cylinder valves remain closed as the timing mark approaches the scale. Adjust the exhaust valves of cylinders No. 2, 3 & 4 and the intake valves of cylinders No. 4, 5 & 6, by performing the following procedures:
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1 Answer

Blown head gaskit need to remove head and replace with new ong


2.2L (VIN 4) Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2. Relieve the fuel system pressure.
  3. Drain the cooling system.
  4. Remove or disconnect the following:
    • Accessory drive belt
    • Air cleaner outlet duct
    • Engine mount
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    • Exhaust manifold
    • Engine Coolant Temperature (ECT) sensor electrical connector
    • Power steering pump
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    • Accessory bracket
    • Spark plug wires
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Cylinder head torquing sequence—2.2L (VIN 4) engine

  1. Install or connect the following:
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    • Lifters
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    • Rocker arm cover. Torque the bolts to 89 inch lbs. (10 Nm).
    • Spark plug wires
    • Accessory bracket
    • Ignition coil assembly
    • Radiator inlet pipe
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  2. Refill and bleed the cooling system.
  3. Start the vehicle and inspect for leaks.

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