Yanmar 4LHA-HTP Operation Manual page 461

Chapter 3 Fuel Injection Equipment
5. Automatic Advancing Timer
5-3 Timer disassembly
(1) Remove the camshaft box nut.
(2) Use a timer extractor to remove the timer assembly.
(3) The retainers and weights can be removed when
you take off the circlip and plate tightening bolts
and separate the timer gear and timer hub.
Note: As the advancing angle has been set at the
factory, do not disassemble the timer unless
necessary.
54 Timer inspection
(1) Inspect the timer spring, and replace if there is
excessive settling or corrosion.
(2) Inspect the retainer guide groove of the timer
weight, retainer, and gear it comes in contact
with, and replace if wear is excessive or move-
ment is not smooth.
(3) Inspect the circlip, and replace if there is excessive
wear.
Note: Recheck advancing angle when replacing
or spring, and readjust as necessary with
ing shims.
Timer assy
5-5 Timer reassembly
(1) Fix the plate by t h e tightening bolts.
Box nut
T i g h t e n i n g t o r q u e
(2) Mount the timer assembly on the fuel injectio
T i g h t e n i n g t o r q u e
weight
adjust-
3-2-39
T i m e r weight
pump camshaft, a n d tighten the box nut with
socket wrench.
122.6 - 132.4(12.5-13.5)
4LHA Seri
C i r c l i p
T i m e r spring
- R e t a i n e r
, — . Retainer guide
" O V A groove
- T i m e r gear
Plate tightening
b o l t
P l a t e
N ( k g f ) m
22.6 ~ 2 6 . 5 (2.3-2.7)
N ( k g f ) m