Yanmar 4LHA-HTP Operation Manual page 449

Chapter 3 Fuel Injection Equipment
3. Disassembly, Reassembly and Inspection of Fuel Injection Pump
(6) Inspection o f rack and control sleeve
1) Rack
Inspect t h e bending of the rack and wear or defor-
mation of i t s fit with ball of control sleeve.
2) Control s l e e v e
Inspect f o r wear or deformation of the ball and fit
to the plunger.
NOTE: Rack resistance increases if the fitting or slid-
ing surfaces are not in good working
and this affects the condition
(rough rpm, over running, etc.)
(7) Inspection o f plunger spring and delivery spring
Inspect springs for scratches, cracks, breakage,
uneven wear and rust.
(8) Inspection o f oil seals
Inspect oil seals to see if they are burred or scratch-
ed.
(9) Inspection o f roller guide stop
Inspect the side of the tip, replace if excessively
worn.
(10) Replacement of O-ring
Replace if they are removed.
3-3 Reassembly o f f u e l injectio p u m p
Preparation
After inspection, arrange and clean all parts.
See Inspection of Fuel Pump for inspection procedure.
(1) Turn the match mark on the flange of plunger
barrel to face left f r o m driving side of the pump,
insert the plunger barrel from the top of the pump,
adjust it with the match mark on pump body, and
tighten the nuts.
order,
of the engine
tightening torque
NOTE:
3-2-27
25.5 - 27.5 (2.6 - 2.8) N(kgf) m
Coat the silicon oil with the O-ring.
41HA Series