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Yanmar 4BY - Installation of Cylinder Head

Yanmar 4BY
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ENGINE
5-32
BY Service Manual
Cylinder Head
Installation of Cylinder Head
1. If the pistons, connecting rods or crankshaft
were refurbished or replaced, check piston
height to determine correct cylinder head
gasket thickness. See Determining Cylinder
Head Gasket Thickness on page 5-31. If those
items remain unchanged, select a gasket that
matches the one removed during disassembly.
Figure 5-36
2. Check condition and placement of alignment
dowel sleeves (Figure 5-36, (1)).
3. Ensure the gasket surfaces of the cylinder head
and cylinder block are clean and dry. Transition
areas (Figure 5-36, (2)) must be absolutely
clean of grease and oil.
IMPORTANT
Ensure the threaded bolt holes are clean
and dry. If coolant or oil remains in the
holes, there is a risk of cracking the cylinder
block when the bolts are installed.
4. Install a new cylinder head gasket having the
correct number of identification holes as
determined in step 1.
5. Install the cylinder head.
4BY Engine
6BY Engine
Figure 5-37
Figure 5-38

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