Yanmar 4TNV98 Service Manual page 193

CAUTION
Do not rotate the engine with the injection pump
removed.
Figure 7-37
Also make matching marks (Figure7-38, (1)) on the
rear of the gear case housing and on the fuel
injection pump mounting flange before loosening
the injection pump mounting nuts.
Figure 7-38
12. While holding the engine from turning with a
wrench on the crankshaft pulley bolt, remove
the pump drive gear retaining nut (Figure7-39,
(1)) and lock washer (Figure7-39, (2)).
4TNV98 & 4TNE98 Diesel Engine
13. Using a two-bolt gear puller, remove the
injection pump drive gear (Figure7-39, (3)) from
the injection pump shaft.
NOTE: The injection pump shaft is tapered with a
woodruff key. Once you have applied some
pressure with the puller. A slight hammer "tap" on
the center puller bolt will help "pop" the gear from
the shaft.
14. Remove the three nuts securing the fuel
injection pump to the rear of the gear case.
15. Remove the fuel injection pump.
16. If the fuel injection pump requires servicing, it
must be taken to an authorized ZEXEL fuel
injection shop.
191
Figure 7-39
Section 4. Fuel System