Adjusting Charge Pressure - 4By - Yanmar BY Series Service Manual

TURBOCHARGER

Adjusting Charge Pressure - 4BY

Note: The waste gate control rod on 6BY
engines is not adjustable.
IMPORTANT
NEVER change the length of the wastegate
control rod without doing it in coordination
with a charge pressure test. (See
Measuring Charge Pressure on page 9-7.)
Doing so will cause incorrect boost
pressure resulting in poor performance or
engine damage, and can void all warranty.
( 1 )
Figure 9-2
1. Remove retainer (Figure 9-2, (1)).
2. Loosen jam nut (Figure 9-2, (2)).
3. Turn wastegate control rod connector
(Figure 9-2, (3)) to shorten or lengthen rod.
• Lengthen the rod to reduce charge pressure.
• Shorten the rod to increase charge pressure.
One-half turn will result in a change of
approximately 25 bar (0.4 psi).
One turn will result in a change of approximately
50 - 60 bar (0.70 - 0.8 psi).
4. Install wastegate control rod connector and
secure with retainer. Tighten jam nut.
9-8
( 3 )
( 2 )
0004041
5. Operate engine under normal load conditions
and verify pressure reading is within
specification. See Measuring Charge Pressure
on page 9-7.
BY Service Manual
Tests and Adjustments