7-5
Chapter 7 ASSEMBLY OF BASIC ENGINE
1.4 Crankshaft - Install
(1) Make sure that the sliding surfaces of the upper main
bearing shells installed in the crankcase are evenly
coated with clean engine oil.
(2) Thoroughly clean the crankshaft with cleaning oil, and
blow off the oil with compressed air. Then, apply an
even coat of clean engine oil to the crankshaft journals.
Note: When cleaning crankshaft, be sure to thoroughly clean
the crank journals, crankpins, and oil holes and make
sure that the crankshaft is free from foreign material
such as machining chips and dirt.Make sure that oil
holes are free from burrs.
(3) Lift the crankshaft keeping in a horizontal attitude, and
slowly install into the crankcase.
Note: When lifting the crankshaft, use fiber slings or pads to
avoid any damage to he crankshaft.
(4) Slowly rotate the crankshaft to verify smooth rotation
of the crankshaft.
Crankshaft - Clean
Crankshaft - Install
1.5 Upper thrust plates - Install
(1) Apply engine oil evenly to the sliding surface of the
upper thrust plate.
(2) Install the upper thrust plates onto the front and back of
rearmost journal through the clearances between the
crankcase and crankshaft.
Note: Install the thrust plate oil groove to face outward of
each journal.
Upper thrust plates - Install
1.6 Lower Main Bearing Shell and Lower Thrust Plate - Install
(1) Install the lower main bearing shell, aligning the lug
with the lug slot in the main bearing cap.
Note: Make the crush heights even.
(2) Apply an even coat of clean engine oil to the sliding
surfaces of lower main bearing shells.
(3) Install the lower thrust plates aligning with the dowel
pins to the rearmost main bearing cap.
Note: Install the lower thrust plates so that the oil groove fac-
es outer side of the cap.
Lower Main Bearing and
Lower Thrust Plates - Install
Blow compressed
air after cleaning.
Apply engine oil to
the crank journal
after cleaning.
Do not damage the thrust plate when installing.
Upper thrust plate
Oil groove
Oil groove
Oil groove
Dowel pin
Lower main
bearing
Lower thrust
plate
Lower thrust
plate
Main bearing cap
Lug slot
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