Pontiac Fiero 1984-1988 Repair Guide

Camshaft Bearings

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REMOVAL & INSTALLATION



4-2.5L Engine

Camshaft bearing removal should be done by a qualified machine shop because the tools needed are expensive and would not be economical to purchase for a one time usage.

  1. Remove the engine from the vehicle as previously outlined.
  2.  
  3. Remove the camshaft from the engine as previously outlined.
  4.  
  5. Unbolt and remove the engine flywheel.
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  7. Drive the rear camshaft expansion plug out of the engine block from the inside using a long prybar.
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  9. Using a camshaft bearing service tool No. J33049 or equivalent, drive the front camshaft bearing towards the rear and the rear bearing towards the front.
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  11. Install the appropriate extension on the service tool and drive the center bearing out towards the rear.
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  13. Drive all of the new bearings into place in the opposite direction of which they were removed, making sure to align the oil holes in the engine block bores.
  14.  


CAUTION
Never reuse camshaft bearings. Always use new bearings.

The front camshaft bearing must be driven approximately 3mm behind the front of the cylinder block to uncover the oil hole to the timing gear oiling nozzle.

To install:

  1. Install the camshaft bearings so that the oil holes in the bearing is aligned with the hole in the block.
  2.  
  3. Install the camshaft and timing gear as outlined in the Camshaft installation procedures.
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  5. Install the timing gear cover, harmonic balancer, all accessories and install the engine into the vehicle as outlined in the Engine installation procedures in this section.
  6.  

6-2.8L Engine


Click image to see an enlarged view

Fig. Fig. 1 Use a piece of wire bent at a ninety degree angle to align the camshaft bearing oil holes



Click image to see an enlarged view

Fig. Fig. 2 Use a camshaft bearing removal/installation tool to remove the bearings. Always follow the specific tool manufacturers instructions for proper tool set-up and operation

Camshaft bearing removal should be done by a qualified machine shop because the tools needed are expensive and would not be economical to purchase for a one time usage.

Camshaft bearings can be replaced with engine completely or partially disassembled. To replace bearings without complete disassembly remove the camshaft and crankshaft leaving cylinder heads attached and pistons in place. Before removing crankshaft, install two inch pieces of rubber hose to the threads of connecting rod bolts to prevent damage to crankshaft. Fasten connecting rods against sides of engine so they will not be in the way while replacing camshaft bearings.

  1. Remove the timing chain front cover and camshaft rear cover as outlined in the Timing Chain Cover and Camshaft removal procedures.
  2.  
  3. Using a camshaft bearing Tool J-33049 or its equivalent, with the nut and thrust washer installed to the end of the threads, index the pilot in the camshaft front bearing and install the puller screw through the pilot.
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  5. Install the remover and installer tool with the shoulder toward the bearing, making sure a sufficient number of threads are engaged.
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  7. Using two wrenches, hold the puller screw while turning the nut. When the bearing has been pulled from the bore, remove the remover and installer tool and bearing from the puller screw.
  8.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Remove the remaining bearings (except front and rear) in the same manner. It will be necessary to index the pilot in the camshaft rear bearing to remove the rear intermediate bearing.
  2.  
  3. Assemble the remover and installer tool on the driver handle and remove the camshaft front and rear bearings by driving towards the center of the cylinder block.
  4.  

The camshaft front and rear bearings should be installed first. These bearings will act as guides for the pilot, and center the remaining bearings being pulled into place.

  1. Assemble the remover and installer tool on the driver handle and install the camshaft front and rear bearings by driving them towards the center of the cylinder block. Make sure the oil holes in the bearing line up with the holes in the block.
  2.  
  3. Using Tool Set J-6098, or its equivalent with the nut and thrust washer installed to end of the threads, index the pilot into the camshaft front bearing and install the puller screw through the pilot.
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  5. Index the camshaft bearing into the bore (with oil hole aligned as outlined below), then install the remover and installer tool on the puller screw with the shoulder toward the bearing.

    The rear and intermediate bearing oil holes must be aligned at 2:30 o'clock.
     
    The front bearing oil holes must be aligned at 1:00 and 2:30 o'clock (two holes).
     

  6.  
  7. Using two wrenches, hold the puller screw while turning the nut. After the bearing has been pulled into the bore, remove the remover and installer tool from the puller screw and check the alignment of the oil holes in the camshaft bearings.
  8.  
  9. Install the remaining bearings in the same manner. It will be necessary to index the pilot in the camshaft rear bearing to install the rear intermediate bearing.
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  11. Clean the rear cover mating surfaces and bolt holes then apply a 3mm bead of RTV to the cover. Install the rear cover and torque the bolts to 6-9 ft. lbs. (8-12 Nm).
  12.  
  13. Install the camshaft as outlined in the Camshaft installation procedures. Install the timing gear cover, all accessories and install the engine into the vehicle.
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