Crankshaft and oil pan parts (Discovery 3)

Item name	Spare part catalog number	Description
1	-	Base plate
2	-	Main bearings - lower

Crankshaft and main bearings

Item name	Spare part catalog number	Description
1	-	Crankshaft
2	-	Thrust washer
3	-	Thrust washer
4	-	Main bearings - upper

Six counterweights ensure low vibration from the four-crank crankshaft, which is supported by five bearings. The cast iron crankshaft also features internal and rolled fillets for increased strength.

The rear crankshaft oil seal is pressed into the joint between the support plate and the cylinder block.

The main bearings are aluminum/tin split plain bearings. An oil groove in the top of each bearing supplies oil to the crankshaft to lubricate the connecting rod bearings. An aluminum/tin thrust washer is installed on both sides of the top of the central main bearing.

Base plate

The support plate is a structural casting. It is bolted to the bottom of the cylinder block and holds the crankshaft in place. The use of a support plate increases rigidity. Iron inserts located in the casting under the main bearing supports minimize changes in bearing clearance due to thermal expansion.

Two hollow pins ensure alignment of the support plate and the cylinder block.

The joint between the support plate and the cylinder block is sealed with sealant.

Oil pan

The aluminum alloy relief oil pan is bolted to the base plate. The aerodynamic oil pan, which is attached to the underside of the base plate, isolates the oil pan from air disturbances caused by crankshaft rotation to prevent oil aeration and improve oil drainage. A rubber plug at the rear of the relief oil pan prevents access to the torque converter mounting bolts. The engine drain plug is located in the right front corner of the oil pan.



The joint between the relief oil pan and the support plate is sealed with sealant.

Oil pump

The oil pump is mounted on the crankshaft at the front of the engine. The inlet and outlet ports of the pump are located opposite the oil grooves in the support plate.

Starter drive plate

Item name	Spare part catalog number	Description
1	-	Starter drive plate
2	-	Bolt

The starter drive plate is mounted on the rear of the crankshaft. The crankshaft speed sensor timing disc is spot welded to the front surface of the drive plate.

Distribution disk