Mitsubishi S4Q, Руководство пользователя

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76 / 174 Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
PISTONS, CONNECTING RODS,
CRANKSHAFT AND CRANKCASE
ENGINE MAIN PARTS
2. Checking clearance between tappet and bore
Measure the diameter of the tappet and the inside
diameter of the bore in the crankcase for the
tappet, as shown in the illustration, to check the
clearance. If the clearance exceeds the service
limit, replace the tappets.
Unit: mm [in.]
10.3 Reassembly
1. Installing tappet
1) Apply engine oil to the tappets and install them
in the bores in the crankcase.
2) Make sure the tappets rotate smoothly.
2. Installing main bearings
1) Install the lower halves of the main bearings in
the main bearing caps. Install the upper
halves of the main bearings in the crankcase.
Figure 135 Checking clearance between tappet and
bore
Item
Nominal
Value
Assembly
Standard
Repair
Limit
Inside
diameter of
bore for
tappet
14
[0.55]
14.000 to 14.018
[0.5512 to
0.5519]
14.100
[0.5551]
Clearance
between
tappet and
bore
__
0.016 to 0.052
[0.0006 to
0.0021]
0.080
[0.0032]
NOTE
If the bores are worn beyond the service limit, replace
the crankcase.
Figure 136 Installing tappet
Apply engine oil
Figure 137 Installing main bearings
Apply engine oil No. 5 bearing
(with flange)
Tab and
notch
NOTE
a Make sure the upper and lower halves of the
main bearings are installed so the bearing
tabs fit into the notch in the crankcase and
main bearing caps.
b Only the upper halves of the main bearings
to be installed in the crankcases has an oil
groove.