Start by measuring each bore; if the first or rear cam bushing's bore is worn too much, replace the service bushing and check the remaining bores for damage or excessive wear. If a bore without a bushing wears past its limit, the engine must be removed to machine it and install service bushings and if it is very worn, the cylinder block should be replaced. Remove the
Camshaft before using a universal cam bushing tool to move the bushing out of the No.1 bore and No.7. While doing this, position a mark on the cylinder block to make sure the oil hole aligns with the bushing's oil hole. When installing the new bushing, put Loctite 640 on its backside so that no adhesive gets into the oil hole. Fix the front bushing with a universal cam flush to the front block face so that the rodhole for the oil can coincide with a 3.2 mm (0.128 in.) diameter rod passage. Carefully slide the rear camshaft bushing onto the block with the oil hole lined up, as a 3.2 mm (0.128 in.) rod should also clear the hole. Be sure at the end to measure the bore inside diameters of the bushings at both the front and rear bushings so that the minimum is 54.083mm (2.1293in.) and the maximum is 54.147mm (2.1318in.).