Dismantling And Installing The Crankshaft Pulley (as from 3 cylinder engine)
Dismantling:
1. Remove the belt driving the air compressor and dismantle the second vee-belt pulley on the crankshaft.
5-3
2. Remove belt driving generator and cooling air blower, and secure vee-belt pulley of crankshaft, using retainer No. 143400 and remove the stud securing the vee-belt pulley and dismantle the vee-belt pulley.
Fig. 5-3
NOTE: The stud securing the vee-belt pulley has a left-hand thread.
Installing:
5-4
1. Align the locating hole in the vee-belt pulley with the locating pin in the crankshaft gearwheel and slide the vee-belt pulley into position.
Fig. 5-4
5-5
2. Having ascertained that the vee-belt pulley is correctly located, tighten and lock down the stud (which has a lefthand thread) in accordance with the instructions for tightening studs and bolts. (Use retainer No. 143400 and angle-of-turn indicator No. 101910).
Fig. 5-5
5-6
3. Mount the pulley to drive the air compressor on the main vee-belt pulley.
Fig. 5-6
4. Assemble the nuts. Mount and tension the vee belts for driving the blower, generator and air compressor.
Removing And Refitting Front Radial Sealing Ring For Crankshaft
Removal:
5-7
Apply puller No. 142700 and draw off radial sealing ring.
Fig. 5-7
Refitting:
1. Grease slightly sealing lip of new radial sealing ring.
5-8
2. Fit radial sealing ring in such a way that lip shows inwards. Press on ring with fitting device.
Fig. 5-8
NOTE: Pay attention to contact traces of radial sealing ring. See also Fig. 5-31. If the contact surface shows on the crankshaft a friction groove caused by the radial ring, displace the latter axially in the front cover.
5-9
NOTE: When moving radial seal, observe correct depth of installation (pressed in). Depth 1 see Fig. 5-9, outside flush with front-end cover.
5-10
Depth 2 (after shifting in front-end cover to be flush inside) : max. 1.0 mm.
Fig. 5-10
Dismantling And Installing The Vee-Belt Tensioner (As from 3 cylinder engine)
Dismantling:
1. Dismantle the holder for the warning system operator. Remove the vee belt driving the cooling air blower.
2. Dismantle the vee-belt tensioner. Remove the rubber O-seal on the vee-belt tensioner.
Installing:
5-11
1. Fit a new rubber O-seal on the vee-belt tensioner.
Fig. 5-11
5-12
2. Mount the vee-belt tensioner with the idler pulley facing outwards.
Fig. 5-12
5-13
3. Mount the holder of the warning system operator if the engine is equipped with an alarm system for breakage of the blower belt. Fit a spacer sleeve between the holder and front cover.
Fig. 5-13
5-14
4. Check the alignment of the vee belt running from the idler pulley to the belt pulley mounted on the crankshaft.
Fig. 5-14
5. If misalignment has to be corrected dismantle the vee-belt idler pulley.
Checking And Repairing The Vee-Belt Tensioner
Tensioner is removed.
5-15
1. If the idler is damaged or its bearing worn, dismantle it from the tensioning lever. Check the radial clearance of the shaft of the vee-belt tensioner.
Fig. 5-15
2. If the shaft has too much radial clearance or if the torsion spring is weak or broken, dismantle the vee-belt tensioner.
5-16
3. After prising out the shaft seal, press out the bearing bushings that are to be renewed. Press in new bearing bushing flush on the inside. Before pressing in the outer bearing bushing, measure the height of the shaft seal and then press in the bearing bushing deeper by this amount.
Fig. 5-16
4. Press in shaft seal flush on outside.
5-17
5. Renew worn shaft. Drive the heavy-duty clamping sleeve into the large bore so that one end projects 15 mm.
Fig. 5-17
5-18
6. To install, insert the end of the shaft at the inside. Press the end of the torsion spring into the clamping sleeve and push in the shaft completely.
Fig. 5-18
NOTE: If the ends of the torsion spring are of different length, insert the longer one in the clamping sleeve.
7. Fit two new gaskets in the groove between the housing and shaft.
5-19
8. Press the tensioning lever on the shaft so that their holes are in register, with the tensioning lever pointing to the right and the long end of the clamping sleeve pointing downwards (as viewed from inside).
Fig. 5-19
5-20
9. Assemble the idler with the old shims to the tensioning lever.
Fig. 5-20
Reassembling The Vee-Belt Tensioner (New Design)
Bearing bushing and shaft seal are already fitted.
5-21
1. Insert long end of torsion spring into shaft and place spacer washer (arrow) in position.
Fig. 5-21
5-22
2. Insert shaft with torsion spring and spacer washer into housing. Position for short end of torsion spring - see arrow.
Fig. 5-22
5-23
3. Push the tensioning lever onto the shaft so that the bores of shaft and lever coincide and the long end of the spring points downwards. Insert locking pin.
Fig. 5-23
5-24
4. Assemble the idler pulley with the old shims to the tensioning lever.
Fig. 5-24
Dismantling And Installing The Vee-Belt Idler (as from 3 cylinder engine)
Dismantling:
5-25
1. Remove vee-belt.
Fig. 5-25
NOTE: To press off the idler pulley, first remove pulley cover.
2. Undo bolt and take off idler pulley. If necessary, renew bearing.
Installing:
3. Mount the idler pulley with shim to tensioning lever. Check for alignment of idler pulley with vee-belt pulley on crankshaft.
5-26
4. Correct any misalignment by inserting shims between idler pulley and tensioning lever.
Fig. 5-26
5. Remount idler pulley. Fasten cover with new gasket. Refit vee-belt.
Renewing The Sealing Ring In The Front Cover
1. The sealing surfaces must be flat and free from score-marks.
2. Drive out the radial sealing ring and renew.
5-27
3. Press in the radial sealing ring with the lip facing inwards so that the outside surface is flush. (Example F2L)
Fig. 5-27
4. As from 3 cylinder engine: dismantle the cover plate on the drive of the hydraulic pump and remove the rubber O-seal.
5-28
5. Fit a new rubber O-seal. Fix the cover with the internally located screw (arrow).
Fig. 5-28
Removing, Mounting And Tightening A Vee Belt
Removal:
Slacken belt at generator and remove.
Refitment:
1. Install belt at minimum pulley spacing.
5-29
2. Tension the vee-belt so that its free movement midway between the two pulleys is 10 to 15 mm when pressure is applied with the thumb.
Fig. 5-29
5-30
3. Tension belt by swinging generator outwards. Tighten strap bolt.
Fig. 5-30
NOTE: Where a split belt pulley is provided, adjust tension by shims. For tensioning air compressor belt, see Section 8. Tensioning, renewing vee-belt for air-compressor.
Checking And Replacing The Vee Belt Pulley And Vibration Damper On An F4/6L
5-31
1. Check the vee-belt pulley and vibration damper for damage and the working surface of the radial sealing ring for score-marks.
Fig. 5-31
5-32
2. If necessary, detach the vee-belt pulley from the vibration damper. Remove the fixing studs from the vee-belt pulley. Renew defective components.
Fig. 5-32
5-33
3. Assemble the vibration damper to the vee-belt pulley. If the engine is fitted with an air compressor, assemble the fixing studs so that the short threaded end makes contact.
Fig. 5-33
Exploded Views
