Yanmar 4LHA-HTP Operation Manual page 347

Chapter 2 Basic Engine
6. Connecting Rod
6-3 Piston pin bushing
(1) Measuring piston pin clearanoe
Excessive piston pin bushing wear may result damage to
the piston pin or the piston itself.
Cylinder gauge
Piston
Piston pin bushing
(1.4579-1.4587)
inside dia
0.030-0.061
Piston pin and bushing
(0.0012-0.0024)
oil clearance
(2) Replacing piston pin bushing
1)When the bushing for the connecting rod piston pin is ei-
ther worn out or damaged, replace it by using the "piston
pin extracting tool" installed on a press.
NOTE: Force the piston pin bushing into position so that its
oil hole coincides with the hole on the small end of the
connecting rod.
mm(in.)
All
Wear limit
Standard
37.10
37.03-37.05
(1.4606)
6-4 Assembling piston and connecting rod
The piston and connecting rod should be assembled so that
the match mamk on the connecting nod large end faces the
fuel injection pump side and the combustion chamber above
the piston is close to the fuel injection pump.
Gear case side
Piston size mark
2-27
M4LHA Seri.
F u e l injection pump
Flywheel
Alignment marl