| Item | Part No. | Part Name | Qty | Serial No. |
| ENGINE, TIER I (SEE FIG. A0100-01A0) | A20637-A20813- | |||
| 1 | YM123900-14200 | TAPPET | A20637-A20813- | |
| 2 | YM123900-14400 | ROD, PUSH | A20637-A20813- | |
| YM123900-14580 | CAMSHAFT | A20637-A20813- | ||
| 3 | (NSS) | CAMSHAFT | A20637-A20813- | |
| 4 | YM129150-02450 | FLANGE | A20637-A20813- | |
| 5 | YM129900-14100 | GEAR | A20637-A20813- | |
| 6 | YM225120-70140 | KEY | A20637-A20813- | |
| 7 | YM261060-80142 | BOLT | A20637-A20813- | |
| 8 | YM123900-25060 | SHAFT, IDLER | A20637-A20813- | |
| YM123900-25100 | IDLER GEAR | A20637-A20813- | ||
| 9 | (NSS) | GEAR, IDLER | A20637-A20813- | |
| 10 | YM129150-25920 | BUSHING, IDLER GEAR | A20637-A20813- | |
| 11 | YM261060-80552 | BOLT | A20637-A20813- | |
| 12 | YM129900-25900 | GEAR, PUMP | A20637-A20813- | |
| 13 | INJECTION PUMP (SEE FIG. A0133-01A0) | A20637-A20813- | ||
| 14 | ENGINE BLOCK (SEE FIG. A0110-01A0) | A20637-A20813- | ||
| 15 | GEAR COVER (SEE FIG. A0111-01A0) | A20637-A20813- |
