(1) Attach the flywheel (3, fig. 82) to the crankshaft (19) and see that the mounting holes are properly alined.
(2) Install the mounting bolts (49), lockwashers (2), and nuts (1).
(3) Tighten the bolts (49) evenly and securely. Proper torque wrench reading is 20 to 25 foot-pounds for five-
sixteenth bolts and 35 to 40 pounds for three-eighths bolts.
h. Checking Flywheel Runout.
(1) Check the flywheel runout whenever the flywheel or clutch is installed.
(2) Attach a dial indicator to the flywheel housing and see that the indicator button is resting against the flywheel
face at a point near the outside diameter of the flywheel.
(3) Set the indicator point at zero.
(4) Make several equally spaced marks on the flywheel and rotate the flywheel to obtain the indicator readings
at those points.
(5) Pry the crankshaft forward each time a reading is taken so that the crankshaft end play will not be mistaken
for the runout of the flywheel face.
(6) If the flywheel runout at any point exceeds 0.004 inch, remove the flywheel and clean the crankshaft and
flywheel mounting surfaces.
(7) Install the flywheel and check again for concentricity and runout. If the flywheel is still out of line, it must be
(8) Make sure that the flywheel mounting bolts are tight and install the engine (par. 175).
a. General. The crankshaft used in this engine is forged of high carbon steel and is carried on four large main
bearings. The crankshaft is precisely balanced and proportioned in relation to the engine size and should seldom cause
trouble. Special attention must be paid to the end play of the crankshaft, because excessive play may damage the front
main bearing, which carries the thrust. The correct crankshaft end play is 0.004 to 0.006 inch.
(3) Remove the screws (31 and 32, fig. 48) and lockwashers (30) attaching the flywheel housing (29) to the
engine block (21). Remove the flywheel housing.
(4) Unscrew and remove the starting jaw (29, fig. 82) and starting jaw washer (30).