CRANKSHAFT MAIN BEARINGS
DESCRIPTION
The crankshaft is supported by four main bearing caps
(1) made of cast iron. Each main cap (1) is fastened
to the cylinder block with four bottom bolts (2) and two
cross horizontal bolts (3) to increase the rigidity of the
lower block. The number three main bearing cap
serves as the thrust washer (5) location.
The upper main bearings have a bi-metal construction
and feature oil supply holes and center grooves for
lubrication of the main journals. The lower main bear-
ings have tri-metal construction to provide strength
where it is needed.
MAIN BEARING SELECTION
Stage
Color
Bearing Thickness
Applies To
1
Blue
2.250mm-2.255mm
(0.0886-0.0888 in.)
Upper and Lower Bearings
2
Yellow
2.255mm-2.260mm
(0.0888-0.0890 in.)
Upper and Lower Bearings
3
Red
2.260mm-2.265mm
(0.0890-0.0892 in.)
Upper and Lower Bearings
4
White
2.265mm-2.270mm
(0.0892-0.0894 in.)
Lower Bearings
5
Violet
2.270mm-2.275mm
(0.0894-0.0896 in.)
Lower Bearings
The upper main bearings are available in three different thicknesses and the lower bearings in five. A color coded
mark on the side of the bearing is used to identify it’s thickness. Each color coded bearing is matched to it’s respec-
tive journal. The select fit is obtained by matching the color coded bearings to grade identification marks on the
cylinder block and crankshaft. Letters marked on the cylinder block identify the color of each upper-half main bear-
ing, while letters marked on the front end of the crankshaft indicate the color of each lower half main bearing.
9 - 2720
ENGINE - 3.0L TD SERVICE INFORMATION
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