Refer to Figures 1,2,3,4 when performing 17-step timing procedure for 1981-1985 Diesel Engines.
Fig 1. Injection pump and camshaft alignment marks - Diesel engine.
Fig 2. Removing the timing belt holder - Diesel engine.
Fig 3. Injection pump alignment marks - Diesel engine.
Fig 4. Tensioiner Pulley Bolt Sequence - Diesel engine.
Procedure - Timing Belt replacement.
1. Disconnect the negative battery cable. Drain the cooling system.
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
2. Remove the timing belt cover. Remove the injection pump sprocket flange.
3. Using a prybar, remove the tension spring from the timing belt tensioner.
When removing the tension spring, avoid using excessive force for the spring may become distorted.
4. Remove the tensioner pulley bolt and the pulley.
5. Remove the timing belt and discard it.
6. Rotate the crankshaft to bring the No. 1 piston to TDC of the compression stroke.
7. Align the timing marks on the injection pump sprocket with the camshaft sprocket; the marks must be facing each other.
8. Using a new timing belt, install it in the following sequence: crankshaft sprocket, camshaft sprocket and the injection pump sprocket; the slack must be between the injection pump and camshaft sprockets.
9. Install the tension center and the tension pulley so the end of the tension center is fitted against both pins on the timing pulley housing.
10. Hand tighten the nut so the tension pulley can be rotated freely.
11. Install the tension spring and semi-tighten the pulley nut to 22-36 ft. lbs. (30-48 Nm).
12. Rotate the crankshaft 2 full turns clockwise to seat the belt and further turn the crankshaft 90° beyond TDC to settle the injection pump.
13. Loosen the tension pulley nut to take up the timing belt slack. Tighten the tension pulley nut to 79-94 ft. lbs. (108-128 Nm).
14. Install the injection pump sprocket flange; the hole in the outer circumference of the flange should be aligned with the triangular timing mark on the injection pump sprocket.
15. Rotate the crankshaft 2 full turns clockwise to bring the No. 1 piston to TDC of the compression stroke. Make sure the triangular timing mark on the timing sprocket is aligned with the hole in the flange, then, measure the timing belt tension; it should be 33-55 lbs.
16. Install the timing belt cover.
17. Connect the negative battery cable.