Yanmar 3JH3E Service Manual page 270

Chapter 10 Disassembly and Reassembly
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(3) If injection timing is off, change the mounting position
using the long hole in the injection pump mounting
flange. Turning the fuel feed pump towards the cylin-
der block slows timing down, while movement in the
other direction makes it faster.
Fuet injection timing (FID) b.TDC12"±1"
Cylinder block side
Fast
Long hole
Slow
Rev. di recton
10-34
Printed in Japan
HINSHI-H8009