Yanmar 1GM User Manual page 124

118
Second ring
CHAPT ER SIX
Top ring
I
~><:§~7::;./_-:Oil
control
Ii
ring
5. Position the piston so the numbered side of the rod
(F igure 41) is toward the camshaft side of the engine. In-
sert the piston/connecting rod assembly into the cylinder
(Figu re 44). Lightly tap on the piston crown with a
wooden hammer handle to insert the piston . Make sure the
rod does not bang against the cranks haft .
6. Clean the connecting rod bearings carefully, includi ng
the back sides. Coat the crankp in journa l and bearings
with clean engine oil. P lace the bearings in the connecting
rod and cap.
7. Pull the connect ing rod and bearing into position
against the cran kpin. Lightly lubr icate the connecting rod
bolt threads with eng ine oil.
8. Install the connecting rod cap. Make sure the rod and
cap are p roperly aligned. Install the cap bolts finger-t ight.
9. Tighten the cap reta ining bolt s to speci fication (Ta ble
4).
10. Check the connec ting rod side clearance as described
under Piston/Connecting Rod Re moval in this chapter.
T IMING GEA RCAS E
The timing gearcase covers the camshaft and cran kshaft
gears and the oil pump
(Figure 45). The
tim ing gearcase
also conta ins the govern or mechanism and serves as the
mounting location for the fue l injection pump. A ball
bearing in the timing gearc ase supp orts the outer end of
the crankshaft.
To
remove
and reinst all the timing
gcarcasc. proceed
as
follows:
Cam shaft
gear
Fuel inject io n
dri ve cam Crankshaft
gear
Oil pump
gear
Governor
flyweight