Yanmar BY Series Service Manual page 122

Cylinder Block and Crankshaft
Figure 5-114
(c) Bearing shells are marked with yellow,
green or white paint (Figure 5-114). Select
bearing shells with color that matches the
paint on the crankshaft.
IMPORTANT
Ensure the bearing inserts and bearing
mounting surfaces are absolutely clean and
free of oil. Ensure all blind threaded holes
are clean and free of oil or other liquid.
Figure 5-115
Note: Install thrust bearing insert (edges wrap
around) in position 4 on 4BY and
position 6 on 6BY. Install insert half
having an oil hole in the cylinder block
(Figure 5-115).
BY Service Manual
IMPORTANT
Install ONLY bearing inserts with yellow
identifying paint in the cylinder block main
bearing bores.
2. Install yellow-painted main bearing inserts in
the cylinder block and main bearing caps. Apply
a generous amount of clean engine oil to the
bearing inserts. Ensure all oil holes are properly
aligned. Do not lubricate the crankshaft journals
at this time.
3. Carefully lower the crankshaft into place. Do not
rotate crankshaft.
4. Check bearing oil clearance before proceeding.
See Measuring Oil Clearance on page 5-63.
5. Apply clean engine oil to the crankshaft journals
and main bearing inserts after oil clearance has
been checked.
IMPORTANT
The main bearing caps are marked and
must be installed in their original positions.
Figure 5-116
IMPORTANT
NEVER reuse main bearing cap bolts.
Always install new ones.
6. Install main bearing caps with the insert
alignment tabs on same side as those in the
cylinder block. Lubricate threads on NEW bolts
with clean engine oil and install.
7. Tighten bearing cap bolts to 22 N·m (16 ft-lb).
ENGINE
5-67