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CYLINDER BLOCK
EM-141
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EM
Revision: 2004 November 2004 FX35/FX45
Piston Skirt Diameter
Measure piston skirt diameter using micrometer.
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-131, "HOW TO SELECT PISTON" .
Re-Boring Cylinder Bore
1. Cylinder bore size is determined by adding piston-to-cylinder bore clearance to piston diameter “A”.
2. Install main bearing caps and main bearing beam, and tighten to the specified torque. Otherwise, cylinder
bores may be distorted in final assembly.
3. Cut cylinder bores.
NOTE:
● When any cylinder needs boring, all other cylinders must also be bored.
● Do not cut too much out of 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 specified piston-to-cylinder bore clearance.
5. Measure finished cylinder bore for out-of-round and taper.
NOTE:
Measurement should be done after cylinder bore cools down.
CRANKSHAFT MAIN JOURNAL DIAMETER
● Measure outer diameter of crankshaft main journals with micrometer.
● If out of the standard, measure the main bearing oil clearance. Then use undersize bearing. Refer to EM-
143, "MAIN BEARING OIL CLEARANCE" .
Measure point
: Distance from the top 41.0 mm (1.614 in)
Standard
: 95.480 - 95.510 mm (3.7590 - 3.7602 in)
PBIC0125E
Standard : 0.010 - 0.030 mm (0.0004 - 0.0012 in)
Limit : 0.08 mm (0.0031 in)
Re-bored size calculation: “D” = “A” + “B” - “C”
where,
“D”: Bored diameter
“A”: Piston diameter as measured
“B”: Piston - to - cylinder bore clearance (standard value)
“C”: Honing allowance 0.02 mm (0.0008 in)
Standard : 59.951 - 59.975 mm (2.3603 - 2.3612 in) dia.
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