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Yanmar 4BY - Page 151

Yanmar 4BY
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FUEL SYSTEM
6-22
BY Service Manual
Repair
Figure 6-26
15. Tighten jack screw (Figure 6-26, (1)) until
high-pressure pump is released from sprocket.
Remove high-pressure pump from engine.
Installation
Figure 6-27
1. Remove jack screw (Figure 6-27, (1)) but leave
sleeve (Figure 6-27, (2)) (special tool OEM No.
13 5 192) installed.
Figure 6-28
2. Ensure gasket surfaces of the engine block and
high-pressure pump are clean. Install new
gasket (Figure 6-28, (1)).
Figure 6-29
Note: The pump shaft may have a keyway cut
into it but no key is used in this
application.
3. Install high-pressure fuel pump and install three
nuts (Figure 6-29, (1)).
CAUTION
DO NOT remove special tools until
high-pressure pump is installed. If the
special tools are removed, the drive
sprocket will no longer be held in the
correct position for reassembly.
0000200en
R13 0675A
2
1

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