Monday, March 5, 2012

Camshafts, Bearings, & Lifters Replacement For Acura?


Camshafts, Bearings, & Lifters
INSPECTION
REMOVAL & INSTALLATION: ---

The details are as follows :----


Inspection



  1. Remove the cylinder head.
  2. Remove the rocker arms.
  3. Put the rocker shafts on the cylinder head, then tighten the bolts to the specified torque, as follows:
    1. Apply engine oil to the bolt threads and flange.
    2. Tighten the 8 x 1.255mm bolts to 17 ft. lbs. (24 Nm).
      image
      Fig. Rocker shaft bolt tightening sequence
  4. Seat the camshaft by pushing it toward the rear of the cylinder head.
  5. Zero the dial indicator against the end of the camshaft. Push the camshaft back and forth and read the end play. If the end play is beyond the service limit, replace the thrust cover and recheck. If it is still beyond the service limit, replace the camshaft:
    1. Standard (new): 0.002-0.008 in. (0.05-0.20mm)
    2. Service Limit: 0.008 in. (0.20mm)

      Click image to see an enlarged view
      Fig. Zero the dial indicator against the end of the camshaft. Push the camshaft back and forth and read the end play
  6. Remove the camshaft thrust cover, then pull out the camshaft.
  7. Wipe the camshaft clean, then inspect the lift ramps. Replace the camshaft if any lobes are pitted, scored or excessively worn.
  8. Use a micrometer to measure the diameter of each camshaft journal.
  9. Zero the gauge to the journal diameter.

    Click image to see an enlarged view
    Fig. Zero the gauge to the journal diameter
  10. Clean the camshaft bearing surfaces in the cylinder head. Measure the inside diameter of each camshaft bearing surface, and check for an out-of-round condition:

    If the camshaft-to-holder clearance is within limits of 0.0020-0.0035 in. (0.050-0.089mm), go to step 11.
    If the camshaft-to-holder clearance is beyond the service limit of 0.006 in. (0.15mm), and the camshaft has been replaced, replace the cylinder head.
    If the camshaft-to-holder clearance is beyond the service limit of 0.006 in. (0.15mm), and the camshaft has not been replaced, go to step 10.

    Click image to see an enlarged view
    Fig. Measure the inside diameter of each camshaft bearing surface, and check for an out-of-round condition
  11. Check total runout with the camshaft supported on V-blocks:

    If the total runout of the camshaft is within the service limit of 0.001 in. (0.03mm) max, replace the cylinder head.
    If the total runout is beyond the service limit 0.002 in. (0.04mm), replace the camshaft and recheck the oil clearance. If the oil clearance is still out of tolerance, replace the cylinder head.

    Click image to see an enlarged view
    Fig. Check total runout with the camshaft supported on V-blocks
  12. Measure cam lobe height and compare with the following cam lobe height standard (new):

    PRI Intake: 1.3676 in. (34.737mm)
    MID Intake: 1.4348 in. (36.445mm)
    SEC Intake: 1.3748 in. (34.919mm)
    Exhaust: 1.4302 in. (36.326mm)

    Click image to see an enlarged view
    Fig. Measure cam lobe height

Removal & Installation



2003-06 Models
Front
  1. Before servicing the vehicle, refer to the precautions section.
  2. Remove or disconnect the following:

    Negative and positive battery cables
    Battery
  3. Drain the coolant.

    Upper radiator hose
    Exhaust Gas Recirculation (EGR) vale
    Timing belt
    Rocker arm assembly
    Front camshaft pulley
    Thrust plate and camshaft
To install:
  1. Install or connect the following:

    Camshaft using a new O-ring. Tighten the thrust plate to 16 ft. lbs. (22 Nm).
    Front camshaft pulley
    Rocker arm assembly
    Timing belt
    Exhaust Gas Recirculation (EGR) vale
    Battery
    Positive, then negative battery cables
  2. Fill the cooling system. 

    Camshaft 

    Click image to see an enlarged view
    Fig. Front camshaft assembly-2003-06 models


    Start the engine and check for leaks.
Rear
  1. Before servicing the vehicle, refer to the precautions section.
  2. Drain the cooling system.
  3. Relieve the fuel system pressure.
  4. Remove or disconnect the following:

    Negative battery cable
    Under-hood fuse box
    Fuel feed hose
    Nuts securing the fuel line

    Click image to see an enlarged view
    Fig. Remove the nuts attaching the fuel line when removing the rear camshaft-2003-06 models
    Brake lines from the master cylinder
    Timing belt
    Rocker arm assembly
    Rear camshaft pulley
    Thrust plate and camshaft
To install:
  1. Install or connect the following:

    Camshaft using a new O-ring. Tighten the thrust plate to 16 ft. lbs. (22 Nm).
    Rear camshaft pulley
    Rocker arm assembly
    Timing belt
    Brake lines to the master cylinder
    Nuts securing the fuel line
    Fuel feed hose
    Under-hood fuse box
    Negative battery cable
2001-02 Models
  1. Before servicing the vehicle, refer to the precautions section.
  2. Remove or disconnect the following:

    Negative battery cable
    Air intake tube
    Accessory drive belts
    Front cover
    Timing belt
    Camshaft sprockets
    Timing belt rear covers
    Ignition coil covers
    Intake manifold cover
    Intake manifold
    Valve cover
    Rocker arms and shaft assembly
    Camshaft thrust cover
    Camshaft

    Click image to see an enlarged view
    Fig. Rocker arm shaft loosening sequence-2001-02 models
To install:

NOTE
Use new O-rings, seals and gaskets when installing the camshaft.

  1. Install or connect the following:

    Camshaft
    Camshaft thrust cover. Tighten the bolts to 16 ft. lbs. (22 Nm).
    Rocker arms and shaft assembly
    Valve cover
    Intake manifold
    Intake manifold cover
    Ignition coil covers
    Timing belt rear covers
    Camshaft sprockets. Tighten the bolts to 67 ft. lbs. (90 Nm).
    Timing belt
    Front cover
    Accessory drive belts
    Air intake tube
    Negative battery cable
  2. Start the engine and check for leaks.


This details will help.
Thanks.

Below is the master help link provided to go through belt routing diagram:---

Timing belt, drive belt, serpentine belt, accessory belt, fan belt, engine belt routing diagrams for all types of car models

http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html 





1 comment:

  1. This is what I called first class useful maintenance tip here. Really useful. Would come in handy some other time.

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    ReplyDelete