81
On models OHV 135 - 175 hold a 1/2"
(12.7 mm) wrench on the rocker arm bearing
while tightening the 5/32" Allen head set screw
to 175 in. lbs. (8.5 Nm) of torque. Rotate the
crankshaft at least one full turn to check push
rod movement and valve lash.
15. Install the rocker arm cover using a new
gasket or o-ring and tighten the screws (with
new "O"rings on OVM, OHM, OVXL) to the
specified torque. Connect the breather hose
to the valve cover fitting on model OHH.
16. Attach the backing plates or baffles. Attach
the governor arm lever if removed.
17. Attach the alternator coil if applicable and
route the wires away from the flywheel area.
18. Install the flywheel spacer if applicable,
flywheel key, flywheel, starter cup if
applicable, bevelled washer (concave surface
in), and flywheel nut. Use strap wrench part
# 670305 to hold the flywheel and tighten
the nut to the specified torque.
19. Install the ignition module using a part #
670297 .0125" (.3175 mm) air gap tool
between the flywheel magnets and the
laminations of the module. Tighten the
mounting screws, remove the tool, and check
for contact while rotating the flywheel. None
should be found. Attach the ignition groundout
lead to the module terminal.
20. Install the blower housing on all engines with
the speed control mounted on the blower
housing or engine block, and attach the
ignition groundout lead at the control if
applicable.
21. Install the intake pipe, speed control,
carburetor, and air cleaner assembly while
hooking the throttle and governor linkage.
Install the blower housing on all engines with
intake pipe mounted speed control brackets.
Check the governor and speed control hook-
up and adjustment - see Chapter 4 under
"Service".
22. Attach the fuel tank if applicable using bolts
.0125" (.3175 mm)
AIR GAP
69
or wedging the tank in the blower housing slots provided. Attach the fuel line and secure with clamps.
23. Slide the fuel line on the carburetor fitting and secure with a clamp. Slide the breather tube on the
carburetor or air cleaner fitting if applicable.
NOTE: If the tank is supplied by the O.E.M. replace the fuel filter. Tecumseh's tanks have a fuel filter
in the tank and service is not necessary.
24. Fill the engine with oil to the full mark on the dipstick. Add fresh fuel to the fuel tank and secure the
cap.
25. Install the spark plug and high tension lead. Mount the engine to the equipment and connect wiring
and control cables. OVRM rotary mower engines require the blade to be secured to the blade hub
adapter and crankshaft before attempting to start the engine.
26. Start the engine and allow it to run approximately five minutes to reach operating temperature. Optimize
the carburetor if adjustable and check for the proper engine speeds.
70
REMOVE
BOLTS
SLIDE TANK
FORWARD
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