AMC Coupes/Sedans/Wagons 1975-1988 Repair Information

Timing Chain/Gear and Sprocket/Pulley

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REMOVAL & INSTALLATION 4-150 Engine



See Figures 1, 2 and 3

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Fig. Fig. 1: Correct timing mark alignment4-150 engine



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Fig. Fig. 2: Install the timing chain and sprockets together4-150 engines



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Fig. Fig. 3: Timing chain tensioner components include the tensioner lever (1) and block (2)4-150 engines

  1. Remove the timing case cover.
  2.  
  3. Rotate the crankshaft so that the timing marks on the cam and crank sprockets align next to each other, as illustrated.
  4.  
  5. Remove the oil slinger from the crankshaft.
  6.  
  7. Remove the cam sprocket retaining bolt and remove the sprocket and chain. The crank sprocket may also be removed at this time. If the tensioner is to be removed, the oil pan must be removed first.
  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.

To install:
  1. Prior to installation, turn the tensioner lever to the unlock (down) position.
  2.  
  3. Pull the tensioner block toward the tensioner to compress the spring. Hold the block and turn the tensioner lever to the lock (up) position. The camshaft sprocket bolt should be torqued to 50 ft. lbs.
  4.  
  5. Install the sprockets and chain together, as a unit. Make sure the timing marks are aligned.
  6.  

To verify that the timing chain is correctly installed:

  1. Turn the crankshaft to place the camshaft timing mark at approximately the one o'clock position.
  2.  
  3. At this point, there should be a tooth on the crankshaft sprocket meshed with the chain at the three o'clock position.
  4.  
  5. Count the number of timing chain pins between the two timing marks on the right side (your right, facing the engine). There should be 20 pins.
  6.  

  1. Install the oil pan, slinger and timing cover.
  2.  

4-151 Engine See Figures 4 and 5

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Fig. Fig. 4: Use a feeler gauge to check the thrust plate end clearance4-151 engine



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Fig. Fig. 5: Correct timing mark alignment4-151 engine

Removal of the camshaft gear requires a special adapter #J-971 and the use of a press. Camshaft removal is necessary.

  1. Place the adapter on the press and place the camshaft through the opening.
  2.  
  3. Press the shaft out of the gear using a socket or other suitable tool.
  4.  


WARNING
The thrust plate must be in position so that the Woodruff key does not damage the gear when the shaft is pressed out.

  1. To install the gear firmly support the shaft at the back of the front journal in an arbor press using pressplate adapters J-21474-13, J-21795-1, or their equivalents.
  2.  
  3. Place the gear spacer ring and thrust plate over the end of the shaft, and install the woodruff key in the shaft keyway.
  4.  
  5. Install the camshaft gear and press it onto the shaft until it bottoms against the gear spacer ring. The end clearance of the thrust plate should be 0.0015-0.0050 in. (0.0381-0.127mm). If less than 0.0015 in. (0.0381mm), the spacer ring should be replaced.
  6.  

6-232 and 258 Engines See Figures 6 and 7

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Fig. Fig. 6: Proper timing mark alignment6-cylinder engines



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Fig. Fig. 7: Place the camshaft sprocket mark at the one o'clock position and count the pins6-cylinder engines

  1. Remove the drive belts, engine fan and hub assembly, accessory pulley, vibration damper and timing chain cover.
  2.  
  3. Remove the oil seal from the timing chain cover.
  4.  
  5. Remove the camshaft sprocket retaining bolt and washer.
  6.  
  7. Rotate the crankshaft until the timing mark on the crankshaft sprocket is closest to and in a center line with the timing pointer of the camshaft sprocket.
  8.  
  9. Remove the crankshaft sprocket, camshaft sprocket and timing chain as an assembly. Disassemble the chain and sprockets.
  10.  

To install:
  1. Assemble the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks aligned.
  2.  
  3. Install the assembly to the crankshaft and the camshaft.
  4.  
  5. Install the camshaft sprocket retaining bolt and washer and tighten to 45-55 ft. lbs.
  6.  
  7. Install the timing chain cover and a new oil seal.
  8.  
  9. Install the vibration damper, accessory pulley, engine fan and hub assembly and drive belts. Tighten the belts to the proper tension.
  10.  

8-304, 360 and 401 Engines See Figures 8, 9, 10 and 11

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Fig. Fig. 8: Correct timing mark installationV8 engines



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Fig. Fig. 9: Position the crankshaft sprocket mark on the center line and count the pinsV8 engines



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Fig. Fig. 10: Check the timing chain for proper deflection8-cylinder 304 engines



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Fig. Fig. 11: Removing the camshaft sprocket retaining bolt


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 timing chain cover and gasket.
  2.  
  3. Remove the crankshaft oil slinger.
  4.  
  5. Remove the camshaft sprocket retaining bolt. and washer, distributor drive gear and fuel pump eccentric.
  6.  
  7. Rotate the crankshaft until the timing mark on the crankshaft sprocket is adjacent to, and on a center line with, the timing mark on the camshaft sprocket.
  8.  
  9. Remove the crankshaft sprocket, camshaft sprocket and timing chain as an assembly.
  10.  
  11. Clean all of the gasket surfaces.
  12.  

To install:
  1. Assemble the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks on both sprockets aligned.
  2.  
  3. Install the assembly to the crankshaft and the camshaft.
  4.  
  5. Install the fuel pump eccentric, distributor drive gear, washer and retaining bolt. Tighten the bolt to 25-35 ft.lb.
  6.  
  7. Install the crankshaft oil slinger.
  8.  
  9. Install the timing chain cover using a new gasket and oil seal.
  10.  

In mid-year 1979, a new timing chain, camshaft sprocket and crankshaft sprocket were phased into production on all V8 engines. These are offered as replacement parts for older engines. When installing any one of these parts on an older engine, all three parts must be installed. None of the new parts is usable in conjunction with the older parts. They must be installed as a set. To determine the necessity for a replacement of an older chain, perform the following deflection test:

  1. Remove the timing case cover.
  2.  
  3. Rotate the sprockets until all slack is removed from the right side of the chain.
  4.  
  5. Locate the dowel on the lower left side of the engine and measure up 3 / 4 in. (19.05mm). Make a mark.
  6.  
  7. Measure across the chain with a straight-edge from the mark to a point at the bottom of the camshaft sprocket.
  8.  
  9. Grab the chain at the point where the straightedge crosses it. Push the chain left (inward) as far as it will go. Make a mark on the block at this point. Push the chain to the right as far as it will go. Make another mark. Measure between the two marks. Total deflection should not exceed 7 / 8 in. (22.23mm).
  10.  
  11. Replace the chain and sprockets if deflection is not within specifications.
  12.  
  13. Replace the timing case cover.
  14.  

 
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