5-101.bk Page 9 Friday, March 17, 2006 11:05 AM
200 ENGINE ASSEMBLY [212 CB] Auxiliary Driveshaft Bushing Replacement DESCRIPTION The front and rear auxiliary driveshaft bushings are identical. Engine lubrication oil passing through the No. 1 camshaft bushing supplies oil to the front auxiliary driveshaft bushing. Oil passing through the No. 4 camshaft bushing supplies oil to the rear auxiliary driveshaft bushing. A groove in the rear auxiliary driveshaft journal, in conjunction with a rifle-drilled hole in the auxiliary driveshaft and a small oil feed tube, supplies lubrication to the air compressor. INSPECTION 1. Using a telescope gauge or inside micrometer, measure the auxiliary bushing bores. Take two readings, perpendicular to each other, in each bore. Record the readings. Refer to Figure 6-10. 2. Compare readings with the tolerances listed in the Fits and Limits chart in this manual.
INSTALLATION
Correct installation of auxiliary driveshaft bushings is very important. If bushings are misaligned, lubrication oil will not be allowed to lubricate the auxiliary driveshaft journal. This will also cause the component lubricated through that journal to run without lubrication and prematurely fail. If the approximately 1.25 inches long (32 mm) oil feed tube, which connects the oil feed hole in the rear of the auxiliary shaft to the oil feed hole in the front of the air compressor crankshaft, is accidentally lost during air compressor or auxiliary shaft service work, the compressor will fail from oil starvation. Also, the loss of oil pressure resulting from the missing tube can cause damage and problems in other components and parts. Refer to Figure 6-11. 1. Position a replacement bushing (2) against the side of the block at the rear bushing bore. Align the oil hole in the bushing with the hole in the block. 2. Using a dark-colored felt-tip marker, mark the block and the bushing with a line (1) to facilitate correct alignment during installation. 3. Clean the surfaces of the bushing and the bore. Dry both surfaces with compressed air.
Figure 6-10 — Auxiliary Driveshaft Bushing ID Check
4. Using camshaft bushing remover/installer kit J 21428-01 (4) and the appropriate pilot adapter J 37713 (3), install the bushing.
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