Yanmar 3TNV82A-B Service Manual page 236

ENGINE
1. Drain the engine cooling water.
2. Remove the battery cable from the battery's
minus (-) terminal.
3. If there is any additional equipment (such as an
air cleaner) installed above the EGR valves,
remove it in advance.
4. Remove the EGR valve connectors.
5. Disconnect the cooling water inlet and outlet
hoses from each EGR valve by loosening the
hose clips. When loosening the clips, put waste
cloth or the like beneath the hose joints in case
water leaks.
4TNV98-E, 4TNV98-Z
1. Loosen the nuts in the coupling flanges of the
exhaust manifold and the EGR pipe.
2. Loosen the bolts in the coupling flanges of the
EGR pipe and EGR valve, and remove the EGR
pipe.
(1)
1 – EGR pipe
Figure 6-155
3. Remove the EGR valve.
6-104
4TNV84T-Z, 4TNV98T-Z
1. Disconnect the cooling water inlet and outlet
hoses from the EGR cooler by loosening the
hose clips.
When loosening the clips, put waste cloth or the
like beneath the hose joints in case water leaks.
2. Loosen the nuts used to connect the exhaust
manifold with the EGR cooler elbow.
3. Loosen the bolts in the coupling flanges of the
EGR cooler and EGR pipe, and remove the
EGR cooler.
4. Remove the elbow from the EGR cooler.
5. Remove the EGR pipe from the EGR valve.
6. Remove the EGR valve.
7. Remove the spacer (for the lead valve).
8. Remove the lead valve.
(1)
(2)
1 – Elbow
2 – EGR cooler
3 – EGR pipe
Figure 6-156
TNV DI Service Manual
EGR system
(3)