KIT-FUEL INJECTION PUMP 3973971 - Caterpillar

Before installing the bearing, ream the bore to the correct size.
Table 6
Table D - Reamer Size Dimension
Bearing Size Reamer Size
25.45 mm (1.002 inch) 25.35 mm (0.998 inch)
34.95 mm (1.376 inch) 34.85 mm (1.372 inch)
46.08 mm (1.814 inch) 45.98 mm (1.810 inch) When reaming through a hole, always enter the hole from the backside. When reaming a blind hole, use a small grinder to remove the burr at the top of the bore. If this procedure is not followed, the reamer will possibly catch on the burr and not follow the bearing bore diameter. A hole not reamed correctly will result in the part being scrapped.The bearing must be installed with a bearing driver and arbor press.
Illustration 25 g03357818The bearing joint (V) must be 30 15° from a center line, which passes through the bearing, bore mounting holes. Refer to Illustration 25.The bearing must be recessed to dimension (Z), 1.57 mm (0.062 inch) below the surface. Refer to Illustration 25.The surface texture (W) of the manifold or cover must be 1.6 µm (63.0 microinch) or smoother. Refer to Illustration 25.The depth of stock removal is limited to the bearing bore depth (X) minus the total length of the bearing (Y) plus 1.57 mm (0.062 inch), dimension (Z).EXAMPLE:X - Y + Z = Minimum Stock RemovalThis step will normally allow 1.57 mm (0.062 inch) material for clean-up on a first time repair.
Table 7
Table E - O-ring Groove Dimensions
Item Dimensions
S 0.76 mm (0.03 inch) chamfer/radius
T 4.11 0.20 mm (0.162 0.008 inch)
U 2.84 0.13 mm (0.112 0.005 inch) The O-ring groove depth (U) must be 2.84 0.13 mm (0.112 0.005 inch) deep. After lapping or grinding the face, check the depth of the O-ring groove and machine again if depth (U) is less than 2.72 mm (0.107 inch).