Drive Plate
| ITEM | DESCRIPTION |
|---|---|
| 1 | Bolt - Drive plate (8 off) |
| 2 | Drive plate |
| 3 | Reluctor ring |
| 4 | Crankshaft |
| 5 | Dowel pin - Drive plate |
The drive plate is used for automatic transmissions only.
The drive plate is located at the rear of the crankshaft. A dowel pin the crankshaft makes sure that the drive plate is indexed correctly.
The drive plate is a fabrication which comprises a formed steel starter ring gear which is attached to the drive plate and reluctor ring. The 2 components are held together as 1 assembly by a form of clinching known as Tog-L-Loc®.
The drive plate is secured to the crankshaft by 8 sealant patched bolts. The bolts can only be used once and must be replaced if removed. Before replacement bolts are used, the holes must be dry and free from oil.
The drive plate has 3 functions:
- To transfer drive from the crankshaft to the transmission.
- To transfer drive from the starter motor to the crankshaft.
- To provide the Engine Management System (EMS) with crankshaft speed and position via a reluctor ring and a Crankshaft Position (CKP) sensor.
The reluctor ring has 58 teeth with 2 teeth missing to provide a gap. The CKP sensor is located in the lower timing chain cover and measures rotational speed and position as the reluctor ring rotates.
The reluctor ring has a service tool slot used during engine service procedures. The drive plate incorporates a steel starter ring gear which enables the starter motor to start the engine.
Four holes in the drive plate provide for the attachment of the automatic transmission torque converter to transfer drive from the crankshaft to the automatic transmission.