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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8. Mount the cylinder cover or flange with the<br />
governor gear assembly installed to the<br />
crankcase using dowel pins to position the<br />
cover and a new gasket. Install the cover down<br />
onto the crankcase and slightly rotate the<br />
crankshaft to allow the governor gear to mesh.<br />
Do not force. Apply a drop of blue Loctite 242<br />
to the cover screw threads and tighten to the<br />
specified torque.<br />
On engines with ball bearings in the cover,<br />
install a thrust washer (if applicable) over the<br />
crankshaft, followed by the retaining ring.<br />
SHAFT<br />
ROTOR<br />
78<br />
On OHV 13.5 -17 engines, install the oil pump<br />
drive shaft into the slot in the end of the<br />
camshaft. Apply engine oil and install the oil<br />
pump ring and rotor, followed by a new "O"<br />
ring and the pump cover. Tighten the screws<br />
to 50-70 inch pounds (5.5 - 8 Nm) torque.<br />
9. Install the breather assembly.<br />
10. Rotate the crankshaft to place the piston at<br />
Top Dead Center (TDC) on the compression<br />
stroke.<br />
NOTE: Always cut the valve seats, never only<br />
lap the seats.<br />
11. Pre-assemble the valves and spring<br />
assemblies into the cylinder head on all engine<br />
models EXCEPT OHM, OHSK80-130, OVM,<br />
OVXL (diag. 65 on page 79). Use a small block<br />
to support the valves tight to their seats while<br />
placing the head on a flat surface. For models<br />
OHH and OVRM, install the springs<br />
(dampening coils toward the head) and<br />
retainers on the valves and use fingers to<br />
compress the springs until the notch in the<br />
retainer is located in the notch in the valve<br />
stem. Repeat the procedure for other valve.<br />
For OHV models, place the springs<br />
(dampening coils toward the head) over the<br />
valve guide and place the valve caps on the<br />
springs with the larger opening away from the<br />
springs. Use spring compressor tool part #<br />
670315A installed on a rocker arm stud, and<br />
either turn the stud in or secure with a locking<br />
nut as shown so about 1-1/2" (38.1 mm) of<br />
the stud is exposed. Compress the spring and<br />
install the valve retainers to lock the valve to<br />
the valve cap. Repeat the procedure for other<br />
valve.<br />
Install the cylinder head using a new head<br />
gasket. On OHV 11-13 models, place the push<br />
rods in the block before installing the head<br />
and head gasket. Tighten the head bolts in<br />
the numbered sequence using 60 inch pound<br />
(6.8 Nm) increments to the specified torque.<br />
NOTE: Tecumseh strongly recommends you<br />
order a complete seal kit. Replace all "O" ring<br />
and gaskets in kit.<br />
RETAINERS HELD BY SPRING<br />
TENSION AGAINST THE CAP<br />
CAP<br />
RING<br />
ROTARY PUMP<br />
NOTE: INSTALL OIL PUMP AFTER THE SUMP IS ON<br />
Not For Resale<br />
www.<strong>Small</strong><strong>Engine</strong><strong>Discount</strong>.com<br />
RETAINER<br />
60<br />
61<br />
62<br />
<strong>VALVE</strong> SPRING<br />
COMPRESSOR TOOL<br />
PART NO. 670315<br />
63