CYLINDER BLOCK
EM-105
C
D
E
F
G
H
I
J
K
L
M
A
EM
CAUTION:
If oversize piston is used, use it for all cylinders with oversize piston rings.
Piston Skirt Diameter
●
Measure outer diameter of piston skirt with a micrometer.
●
Measure point “H”(Distance from the top): 42 mm (1.65 in)
Piston to Cylinder Bore Clearance
●
Calculate by piston skirt diameter and cylinder bore inner diameter (direction“X”, position “B”).
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diameter)
●
If it exceeds the limit, replace piston/piston pin assembly. Refer to
EM-94, "HOW TO SELECT PISTON"
.
Re-boring Cylinder Bore
1.
Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.
2.
Install main bearing caps, and tighten to the specified torque. Otherwise, cylinder bores may be distorted
in final assembly. Refer to
EM-88, "ASSEMBLY"
.
3.
Cut the cylinder bores.
NOTE:
●
When any cylinder needs boring, all other cylinders must also be bored.
●
Do not cut too much out of the cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at
a time.
4.
Hone cylinders to obtain the specified piston to cylinder bore clearance.
5.
Measure finished the cylinder bore for out-of-round and taper.
NOTE:
Measurement should be done after the cylinder bore cools down.
Standard
: 92.980 - 93.010 mm (3.6606 - 3.6618 in)
PBIC0125E
PBIC0126E
Standard
: 0.010 - 0.030 mm (0.0004 - 0.0012 in)
Limit
: 0.08 mm (0.0031 in)
Rebored size calculation: D = A +B - C
where,
D: Bored diameter
A: Piston skirt diameter as measured
B: Piston to bore clearance (standard value)
C: Honing allowance 0.02 mm (0.0008 in)