Yanmar 4BY2, Service Manual, Page: 131 / 248

ENGINE Exhaust Manifold
12/05
BY Service Manual 5-69
© 2009 Yanmar Marine International
EXHAUST MANIFOLD
Remove
1. Remove heat exchanger. See Remove and
Install Heat Exchanger on page 7-13.
2. Remove turbocharger. See Remove
Turbocharger on page 9-6.
3. Remove exhaust manifold nuts and exhaust
manifold (Figure 5-134, (1)).
Figure 5-134 6BY2 Engine Shown
Figure 5-134
Install
1. Clean mounting surfaces of all gasket material.
2. Apply a light coating of copper anti-seize to
mounting studs.
3. Install new gaskets.
4. Install exhaust manifold with new nuts.
5. Tighten exhaust manifold nuts to the torque
specification using a uniform cross pattern
starting from the center out to each end.
Specifications
6. Install turbocharger. See Install Turbocharger
on page 9-6.
7. Install heat exchanger. See Remove and Install
Heat Exchanger on page 7-13.
0006654
(1)
Item Engine Torque
Exhaust Manifold
Nut Torque
4BY2
23 N·m (204 in.-lb)
6BY2