CYLINDER BORING
HINT:
• Bore all the six cylinders for the oversized piston
outside diameter.
• Replace all the piston rings with ones to match
the oversized pistons.
1. KEEP OVERSIZED PISTONS
Oversized piston diameter:
O/S 0.50
87.860 – 87.890 mm (3.4590 – 3.4602 in.)
2. CALCULATE AMOUNT TO BORE CYLINDERS
(a) Using a micrometer, measure the piston diameter at
right angles to the piston pin center line, 26 mm (1.02
in.) from the piston head.
(b) Calculate the amount of each cylinder is to be rebored
as follows:
Size to be rebored = P + C – H
P = Piston diameter
C = Piston oil clearance
0.130 – 0.150 mm (0.0051 – 0.0059 in.)
H = Allowance for honing
0.02 mm (0.0008 in.) or less
3. BORE AND HONE CYLINDER TO CALCULATED
DIMENSIONS
Maximum honing:
0.02 mm (0.0008 in.)
NOTICE: Excess honing will destroy the finished round–
ness.
(b) If the cap nut cannot be turned easily, measure the
outer diameter of the compressed thread with a ver–
nier caliper.
Standard outer diameter:
7.860 – 8.000 mm (0.3034 – 0.3150 in.)
Minimum outer diameter:
7.60 mm (0.2992 in.)
HINT: If the location of this area cannot be judged by
visual inspection, measure the outer diameter at the
location shown in the illustration.
If the outer diameter is less than minimum, replace the
connecting rod and rod cap nut as a set.
–ENGINE ENGINE MECHANICAL
EG2–112
To Next Page
Loading...
Need help?
General
