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 17. Measure the thickness c the soft lead wire.
NOTE
For proper clearance the thickness should be .004 to .006
The location and number of crankcase
inch. If the clearance is less than .004 inch add shims to
explosion valves may vary with different
each side of the bearing. Example: When the clearance is
installations. In most cases there are four
found to be .002 inch add a .003-inch shim to each side of the
crankcase explosion valves located on the
main bearing. When the clearance is found to be .011 of an
left side of the engine and three located on
inch, remove a .006-inch shim from each side of the main
the right side of the engine mounted on
bearing.
the crankcase inspection plates.
NOTE
(3) Remove bearing tool. Use a straight edge to assure
When adjusting the main bearings for
lower bearing half is properly seated in saddle bore.
proper clearance by adding or removing
(4) Lock lower bearing half in position with clamps
shims always recheck the bearing
bored to fit over studs (8, fig. 3-26). Clamps must be wide
clearance, as outlined above.
enough to hold bearing half in saddle bore, yet not touch
crankshaft journal. Use lengths of pipe over studs (8) so nuts
18. Install main bearing cap with the shims in their
(9) will be able to tighten down enough to hold clamps in
proper position.
place.
19. Replace the main bearing stud nuts and
(5) Coat crankshaft journal with prussian blue and turn
tighten evenly to 350 foot-pound torque.
crankshaft through about three revolutions so that high spots
20. Replace cotter pins.
in bearing half will pick up some blue.
(6) Remove clamps installed in (4) above. Install
NOTE
bearing tool in oil hole in journal, then turn crankshaft to roll
When all main bearings are to be removed
bearing half out of saddle bore. Lift bearing half from journal
for repair, remove and replace every other
and examine surface. If at least 85 percent of surface has
picked up blue it is ready for lapping. If less than 85 percent
bearing.
is blue, the bearing half must be scraped
(2) To remove the crankcase explosion valve proceed
as follows:
3-25. Thrust Bearing (Kingsbury)
(a) Back off capscrews holding the crankcase
a. General. The kingsbury thrust bearing is a two-shoe
inspection plates and lift off.
propeller thrust bearing. It has two pairs of thrust shoes, (two
(b) Remove explosion plate cover, gasket, and
for ahead, and two for astern) individually adjustable fore and
spring.
aft by jack screws and a journal bearing, all mounted in one
(c) Wash in clean fuel oil and wipe dry.
housing with a suitable end closures (fig. 3-27). It is installed
(d) Inspect the spring. If broken, replace spring.
just aft of engine (between flywheel and propeller shaft).
(e) Assemble crankcase explosion valve in reverse
order of disassembly. Use a new gasket.
3-64
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