(par. 222a), oil pans (par. 217a), camshaft (par. 224a), and pistons, connecting rods and rings (par. 223a). After
removing the main bearings, be sure to keep them with their bearing caps (8, 10, and 11), and cap screws (9). Do not
loose the dowel pins (7). Place the oil seal half (5) on a clean surface. The pipe plug (6) and drain cock (12) need not be
removed unless damaged.
b. Inspection. Measure the inside diameter of the cylinder sleeves (4, fig. 106) with an inside micrometer caliper
(par. 179). Check the sleeves for out of round by taking several measurements down the base and around the inside
diameter. They should measure from 5.500 to 5.501 inches. Replace the sleeves if one measures greater than the
maximum out-of-round. Remove a sleeve by driving it up from the bottom with a mallet and a hardwood block, or with a
cylinder liner puller (par. 179). Before installing a new sleeve make sure the crankcase bore and sleeve upper seating
surface are clean. Install new packing rings (3) in the crankcase grooves. Apply a liberal amount of soap to the rings and
grooves. Guide the new sleeve into the bore and carefully drive it into place. Clean the crankcase in solvent and remove
all dirt and grease deposits.
NOTE
Test the cooling system for leaks into the crankcase after installing a cylinder sleeve.
Insert the camshaft (3, fig. 105) into the crankcase (1, fig. 106) and measure the camshaft to bushing clearance. On all
bushings (13 and 14) this clearance should be from 0.0015 to 0.0035 inches.
Drive out any camshaft bushing where the clearance is greater than 0.0035 inch. Press in a new bushing with an arbor
press (par. 179). If the rear bushing is at fault, replace the Welch plug (15). Replace any valve tappets (16) that show
scratches or nicks. Replace worn oil seals.
c. Installation. Replace the crankshaft and main bearings (par. 222d) with the bearing caps (8, 10, 11), dowel pins
(7) and cap screws (9). Tighten the cap screws to 150 foot-pounds of torque. Install the oil seal (5) in the crankcase
recess. Install the pistons, connecting rods and rings (par. 223c) and camshaft (par. 224c). Insert the valve tappets (16).
Install the oil pans (par. 217c), gear cover (par. 220c), rear support (par. 221c), crankcase covers (par. 216c), and both
cylinder heads (pars. 122e and 126c). Install the engine-compressor in the frame (par. 215).
Section XIII. TOOL BOXES AND RUNNING BOARDS
226. Description
The three tool boxes on the front and sides of the engine-compressor contain all the air-operated tools furnished with
the equipment.
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