4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount
4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount
4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount
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On models OHV 135 - 175 hold a 1/2"<br />
wrench on the rocker arm bearing while<br />
tightening the 5/32" Allen head set screw to<br />
75 in. lbs. (8.5 Nm) of torque. Rotate the<br />
crankshaft at least one full turn to check push<br />
rod movement and valve lash (diag. 70).<br />
Current production models OHV135 - 175 use<br />
a 1/2" wrench to tighten the rocker arm<br />
bearing to the correct valve lash. Once<br />
adjusted use a 1/2" socket and torque the jam<br />
nut to 130 inch pound (14.7 Nm). Rotate the<br />
crankshaft one full turn to check push rod<br />
movement and correct valve lash (diag. 71).<br />
15. Install the rocker arm cover using a new<br />
gasket or o-ring and tighten the screws to the<br />
specified torque. Connect the breather hose<br />
to the valve cover fitting on model OHH.<br />
16. Attach the backing plates or baffles. Attach<br />
the governor arm lever if removed.<br />
17. Attach the alternator coil if applicable and<br />
route the wires away from the flywheel area.<br />
18. Install the flywheel spacer if applicable,<br />
flywheel key, flywheel, starter cup (if<br />
applicable), bevelled washer (concave surface<br />
in), and flywheel nut. Use strap wrench part #<br />
670305 to hold the flywheel and tighten the<br />
nut to the specified torque.<br />
19. Install the ignition module using a part #<br />
670297 .0125" (.3175 mm) air gap tool<br />
between the flywheel magnets and the<br />
laminations of the module (diag. 72). Tighten<br />
the mounting screws, remove the tool, and<br />
check for contact while rotating the flywheel.<br />
None should be found. Attach the ignition<br />
ground lead to the module terminal.<br />
20. Install the blower housing on all engines with<br />
the speed control mounted on the blower<br />
housing or engine block, and attach the<br />
ignition groundout lead at the control if<br />
applicable.<br />
21. Install the intake pipe, speed control,<br />
carburetor, and air cleaner assembly while<br />
hooking the throttle and governor linkage.<br />
Install the blower housing on all engines with<br />
intake pipe mounted speed control brackets.<br />
Check the governor and speed control hookup<br />
and adjustment - see Chapter 4 under<br />
"Service".<br />
1/2"<br />
TORQUE<br />
WRENCH<br />
5/32"<br />
ALLEN<br />
WRENCH<br />
1/2"<br />
WRENCH<br />
OHV135 - 175 70<br />
1/2"<br />
WRENCH<br />
.0125" (.3175 mm)<br />
AIR GAP<br />
71<br />
72<br />
Not For Resale<br />
www.<strong>Small</strong><strong>Engine</strong><strong>Discount</strong>.com<br />
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