Timing Chain Lower
Timing Chain, Gear and Tensioner, Engine Set, Renew
- Remove the timing cover.
- Remove the upper tensioner pedestal flanged securing bolts (3 Fig. 1).
- Remove the pedestal I tensioner assembly and chain damper (1 Fig. 1).
- Remove the tensioner pivot pin (2 Fig. 1) and remove the tensioner from the pedestal.
- Remove the flanged bolts (5 Fig. 1) securing the upper static damper and remove the damper (4 Fig. 1) and remove the damper pedestal and the upper timing chain (6 Fig. 1).
- Remove the lower timing chain tensioner securing bolts (11 Fig. 1) and remove the tensioner assembly (10, 12 Fig. 1).
- Remove the lower timing chain (8 Fig. 1) from the intermediate sprocket (9 Fig. 1).
- Remove the intermediate sprocket and bearing.
- Remove the bolts (16 Fig. 1) securing the oil pump drive chain damper and remove the damper (17 Fig. 1).
- Remove the flanged bolts securing the lower static damper (14 Fig. 1) and remove the damper (15 Fig. 1).
- Fit and tighten the bolt securing the crankshaft pulley. Fit Service Tool JD 130 chain link remover/replacer (1 Fig. 2) to the master link (rotate the engine as necessary to align the link). Ensure the tool aligns to the master link, position the `E' gate (2 Fig. 2) to the tool and seat behind the chain (3 Fig. 2).
- Fit and tighten the tool handle ensuring that the extractor cones (4 Fig. 2) line up with the link pins. Extract the link.
- Slacken the tool carefully ensuring that no components fall into the oil pan. Remove the oil pump chain.
- Remove the lower timing chain from the sprockets.
- Using a suitable drift, remove the crankshaft sprocket.
- Remove the power assisted steering pump assembly.
- Remove the bolt securing the drive-plate. Remove the drive-plate.
- Remove the auxiliary shaft oil seal. Using right-angled snap-ring pliers, displace and remove the drive shaft snap-ring.
- Remove the drive shaft.
- Remove the drive shaft rear thrust washer.
- Fit Service Tool 18G 1434 to the bearing situated in the front of the cylinder block (2 Fig. 3). Locate the center peg. Tighten the tool nut to withdraw the bearing shell (1 Fig. 3).
- Remove the tool and shell assembly. Slacken off the tool nut and withdraw the center peg. Remove and discard the shell. Remove the blanking plate from the timing cover.
- Repeat the procedure to remove the timing cover and drive shaft housing bearing shells.
- Clean all component parts and check for wear or damage, renew worn or damaged components as necessary. Check for wear and renew the auxiliary shaft bushes (1 Fig. 1) using Service Tool 18G 1434 (2 Fig. 1).
- Lubricate all bearing shells. Refit all shells using 18G 1434.
CAUTION: Ensure that the oil feed holes are lined up with the holes in the bearing shell (1 Fig. 2).
- Fit the timing cover blanking plate to the timing cover. Fit and tighten the securing bolts.
- Lubricate and fit the auxiliary shaft to the housing.
- Lubricate and fit the thrust washer.
- Refit the auxiliary shaft snap-ring.
- Fit a new oil seal to the rear of the shaft.
- Fit and align the oil pump drive-plate to the auxiliary shaft.
- Apply sealant to the bolt securing the drive-plate, fit and tighten the bolt. See Service Materials under Engine, Specifications, Fluid Types.
- Refit the power assisted steering pump.
- Fit the new sprocket to the crankshaft.
- Using a straight edge (2 Fig. 3), check the alignment of the oil pump drive sprocket (1 Fig. 3), and the crankshaft sprocket (4 Fig. 3).
- If the alignment is incorrect, proceed as follows:
- Push back the lock tabs from one bolt securing the oil pump drive sprocket, and remove the bolt.
- Rotate the sprocket. Push back the lock tabs from the second bolt, and remove the bolt.
- Rotate the sprocket, push back the lock tabs and remove the remaining bolt.
- Remove the tab washer and drive sprocket.
- Remove the shims (3 Fig. 3). Calculate the thickness of shim(s) required for correct sprocket alignment.
- Fit and tighten a dummy stud to the oil pump drive flange. Fit and align the shims to the flange. Fit and align the sprocket. Fit and align the new tab washer.
- Fit and tighten the first sprocket securing bolt. Do not lock over the tab washer at this stage.
- Rotate the sprocket for access.
- Fit and tighten the second sprocket securing bolt. Lock over the tab washer.
- Rotate the sprocket for access.
- Remove the dummy stud. Fit and tighten the third sprocket securing bolt. Lock over the tab washer.
- Rotate the sprocket for access.
- Re4ighten the first securing bolt. Lock over the tab washer.
- Re-check the sprocket alignment.
- Re-adjust as necessary.
- Lubricate the new timing chain and position the chain over the auxiliary drive shaft and crankshaft sprocket.
- Lubricate the oil pump drive chain.
- Fit the drive chain to the oil pump sprocket.
- Engage the drive chain to the crank sprocket.
- Ensure that the drive chain ends are on the damper side of the sprockets.
- Fit a new link to the drive chain (2 Fig. 1).
- Fit and align a link plate to Service Tool JD 130 (1 Fig. 1). Ensure that the link and tool clamp holes are aligned. Fit the tool/link plate assembly to the drive chain.
- Fit the `E' gate (3 Fig. 1) to the tool and chain link. Ensure that the chain is central to the tool. Tighten the tool center bolt, fully seating the plate on to the link.
- Slacken off the tool center bolt.
- Re-position the tool clamp (4 Fig. 1) away from the chain. Locate the link riveting head on to the clamp. Tighten the tool center bolt (finger tight, then further 1/2 to 3/4 turn). Slacken off the tool center bolt. Remove the tightening bar.
- Re-position the clamp away from the chain.
- Re-position the `E' gate away from the tool I chain. Remove the tool retaining handle and remove the tool.
- Attach a dial test indicator to the top of the engine with the stylus resting on a piston. Rotate the engine and set No. 1 cylinder (Fig. 2) at TDC. Refit the lower static damper. Fit and tighten the securing bolts and lock over the tab washer. Fit the oil pump chain damper in position, do not tighten the securing bolts at this stage. Take any slack out of the chain using hand pressure to push the damper towards the center of the engine.
- Tighten the bolts securing the damper.
- Lubricate the intermediate sprocket bearing.
- Lift up the chain, engage the sprocket in the chain, and locate the sprocket into the bearing.
- Refit the lower tensioner assembly.
- Lubricate the upper timing chain.
- Refit the upper chain to the intermediate sprocket.
- Refit the upper static damper.
- Fit and tighten the securing bolts.
- Refit the upper tensioner.
- Renew the oil seal (1 Fig. 3) and refit the timing cover.