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9-28 CRANKSHAFT/TRANSMISSION
Pistons
•
Apply molybdenum disulfide oil solution to the cylinder
bore and piston skirt.
•
Install the piston with its marking hollow [A] facing exhaust
side.
•
Using the piston ring compressor assembly [B] to install
the piston from the cylinder head side.
Special Tools - Piston Ring Compressor Grip: 57001-1095
Piston Ring Co mpressor Belt,
67 ∼ 79:
57001-1097
•
Install:
Crankshaft (see Crankshaft Installation)
Connecting Rod Big End Cap (see Connecting Rod In-
stallation)
CylinderWear(UpperCrankcase)
•
Since there is a difference in cylinder wear (upper
crankcase) in different directions, take a side-to-side and
a front-to-back m easurement at each of the two locations
(total of four measurements) shown in the figure.
If any of the cylinder inside diameter measurements ex-
ceeds the service limit, replace the crankcase.
10 mm (0.39 in.) [A]
60 mm (2.36 in.) [B]
Cylinder Inside Diamete r
Standard: 75.990 ∼ 76.006 mm (2.9917 ∼ 2.9924 in.)
Service Limit: 76.09 m m (2.9957 in.)
Piston Wear
•
Measure the outside diameter [A] of each piston 5 mm
(0.20 in.) [B] up from the bottom of the piston at a right
angle to the direction of the piston pin.
If the measurement is under service limit, replace the pis-
ton.
Piston Diameter
Standard: 75.959 ∼ 75.974 mm (2.9905 ∼ 2.9911 in.)
Service Limit: 75.81 m m (2.9846 in.)
Piston Ring, Piston Ring Groove Wear
•
Check for uneven groove wear by inspecting the ring seat-
ing.
The rings should fit perfectly parallel to groove surfaces.
If not, replace the piston and all the piston rings.
•
With the piston rings in their grooves, make several mea-
surements with a thickness gauge [A] to determine piston
ring/groove clearance.
Piston Ring/Groove Clearance
Standard:
Top
0.03 ∼ 0.07 mm (0.0012 ∼ 0.0028 in.)
Second 0.03 ∼ 0.07 mm (0.0012 ∼ 0.0028 in.)
Service Limit:
Top
0.17 mm (0.0067 in.)
Second 0.17 mm (0.0067 in.)
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