Operating instructions

MAY 1980 7-5
7-15. CAMSHAFT (See Figure 4-23).
a. Tap a Woodruff key (3) on front end of camshaft
(9) and install bevel gear (2).
b. Install gears (5 and 6) on the IO-520-A camshaft
and gear (6) only on the IO-520-B and C camshafts,
and secure with four screws (4).
WARNING
Camshaft (permold engines) must have
rear pipe plug (7) and front expansion
plug (8) installed in camshaft before
camshaft is assembled in engine.
7-16. CRANKCASE, SANDCAST (See Figure 4-
21).
a. Replace any pipe plugs removed during previous
operations.
b. Install oil temperature control valve (23) in right
crankcase. Tighten and secure with lockwire.
c. Install new gasket (37), governor pad cover (36)
and attaching parts (32,33,34,35).
d. If mount brackets (65) were removed, reinstall
them and attaching parts (62,63,64).
e. Turn both crankcase halves open side up. If squirt
nozzles (72) were removed, reinstall them. Lubricate
all camshaft bearings and main bearing inserts. Install
main bearings so bearing ends project equally.
7-17. CRANKCASE, PERMOLD (See Figure 4-
22).
a. Replace any pipe plugs removed during previous
operations. Install machine thread plugs.
b. Install gaskets (7, 6) and oil filler tube (5). Secure
with attaching parts (2, 3,4).
c. Install gasket (19), governor pad cover (18) and
secure with attaching parts (14, 15, 16, 17).
d. Install gasket (24), camshaft hole cover (23) and
attaching parts (20,21,22).
e. Install "O" rings (47 and 62) and install mounting
legs. Secure with attaching parts (52, 53,54).
(Applicable to IO-520-C only.)
f. Lay crankcase halves open side up. Make sure
squirt nozzles(69) are in place. Lubricate cam
bearings and main bearings. Insert main bearings so
that edges project equally.
7-18. FUEL INJECTION CONTROL AND AIR
THROTTLE BODY ASSEMBLY.
CAUTION
Use only a fuel soluble thread lubricant
on any fuel injection system connection
fitting.
NOTE
General instructions for reassembly of
fuel injection components will apply to
all engine models.
NOTE
Prior to reassembly of fuel injection
components, any replacement fittings
should first be screwed into proper size
holes in a block of soft wood to reduce
likelihood of metal particles entering the
system.
a. Install plugs and any necessary replacement
connection fittings in proper ports of fuel injection
components. (See Figures 7-3 thru 7-5)
b. Install shaft and throttle plate in air throttle body, if
removed, and fuel control and mixture control levers
on end sections of shaft. Secure with nut and cotter
pins.
c. Install fuel injection control unit assembly on air
throttle body along with shroud assembly, but do not
secure shroud until fuel injection hoses are installed
on control unit.
d. Install all throttle control rod assembly linkage
with spring, washers and cotter pins.