REMOVAL & INSTALLATION
B27, B28 and B280 Engines
See Figures 1 and 2
These models are equipped with wet cylinder liners which are inserted into the block and are sealed off from the coolant jacket by the head gasket and a bottom shim. The tightness of the heads on the block seals the liners.After the pistons have been removed, the liners may be removed from the block. Check the mating surfaces and make sure they are clean and free of defects.
When installing liners, it is very important to obtain the correct liner height above the block. The correct height is 0.0063-0.0091 in. (0.16-0.23mm) with 0.0091 in. (0.23mm) preferred. This height is adjustable by using shims at the bottom of the liner.
Install the new liner in cylinder No. 1 and use the retainer bar finger-tight to hold it in place. Measure the liner height at three different locations. Use the highest reading as a basis for calculating the proper shim height. Select a shim which is at or just under the calculated necessary thickness.
Install the same size shim on all liners and install the liners in the motor. The color marking should face upward and be visible when the liner is installed. The tongues on the inside of the shim should fit into the groove in the liner. (In the diagram A is the color marking, B shows the tongues and C indicates the liner groove). Again measure the liner projection above the deck for EACH liner and exchange shims as necessary.
LOWER CRANKCASE INSTALLATION
B27, B28 and B280 Engines
See Figure 3
After the pistons and connecting rods have been installed, install the rubber ring for the oil channel and apply sealing compound to the block surfaces. Remove the main bearing nuts and the spacers and make certain that none of the studs have come loose.
Position the lower crankcase in place and install all nuts and bolts but do not tighten. Make sure that lower crankcase and the block are flush at the rear of the block to prevent warpage of the flywheel casing. Tighten the eight main bearing nuts to 22 ft. lbs. (30 Nm) in the sequence shown in the illustration. Loosen nut no. 1 in the illustration then tighten it to 22-25 ft. lbs. (30-34 Nm).
Install a protractor attachment to the torque wrench socket and set up a stationary pointer for reference. Tighten nut No.1 to 73-77° according to the protractor on the socket. Repeat this procedure with nuts 2, 3, 4, 5, 6, 7 and 8 in the illustration in that order. Tighten all of the attaching bolts in lower crankcase except the rear seal retainer bolts to 11-15 ft. lbs. (15-20 Nm). Tighten the rear seal retainer bolts to 7-11 ft. lbs. (9-15 Nm).