- Drive gear assembly
- front cover
Drive gear
| Pos. | spare part no | Name |
| 1 | - | Exhaust sprocket |
| 2 | - | Intake shaft sprocket |
| 3 | - | Main drive chain |
| 4 | - | Main drive chain guide |
| 5 | - | Injection pump sprocket |
| 6 | - | Bolt (4 things.) |
| 7 | - | Main drive chain guide |
| 8 | - | Bolt (2 pcs.) |
| 9 | - | crankshaft sprocket |
| 10 | - | Additional drive chain |
| 11 | - | Bolt (2 pcs.) |
| 12 | - | Automatic tensioner |
| 13 | - | Main drive chain tensioner arm |
| 14 | - | Bolt (4 things.) |
| 15 | - | Main drive chain guide |
The multi-link main drive chain transmits rotation from the crankshaft sprocket to the exhaust camshaft, intake camshaft and injection pump. An additional drive chain transmits rotation from the crankshaft sprocket to the oil pump located at the bottom of the ladder frame.
The drive sprocket is mounted on the crankshaft with one bolt, 3 bolts fix the vibration damper to the crankshaft through the holes in the drive sprocket. The position of the intake and exhaust camshaft sprockets is adjusted using a bushing tool and an adjusting pin. Once installed in the correct position, 3 bolts are used to secure the sprockets to the camshafts.
Each chain has a hydraulic tensioner powered by engine oil. Lubrication of the main chain is carried out through syringe tubes located in the center of the front of the cylinder block. The auxiliary chain is lubricated by spraying oil from the ladder frame and from the oil pan. The primary chain tensioner acts on the pivoting flexible tensioner plates. The secondary chain tensioner acts directly on the chain. The guides are installed on the drive side of the primary circuits.
Front cover
| Pos. | spare part no | Name |
| 1 | - | Bolt (20 pcs.) |
| 2 | - | front cover |
| 3 | - | Pin |
| 4 | - | Guide pin |
| 5 | - | screw (2 pcs.) |
| 6 | - | Centering tool |
| 7 | - | Discharge device |
| 8 | - | Bolt (2 pcs.) |
| 9 | - | screw |
| 10 | - | Hairpin |
The stamped steel front cover is bolted to the front of the cylinder block, block head and ladder frame with 20 bolts and sealed with a small amount of room temperature curing silicone (RTV).
Installing the front cover requires a special tool that is inserted into the hole in the camshaft sprocket to center the cover.
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