Revision: 2005 August 2005 350Z
PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore Inner Diameter
? Using bore gauge, measure cylinder bore for wear, out-of-round
and taper at six different points on each cylinder. (?X? and ?Y?
directions at ?A?, ?B? and ?C?) (?X? is in longitudinal direction of
? If the measured value exceeds the limit, or if there are scratches
and/or seizure on the cylinder inner wall, hone or re-bore the
? Oversize piston is provided. When using oversize piston, re-
bore cylinder so that the clearance of the piston-to-cylinder bore
satisfies the standard.
When using oversize piston, use over size pistons for all
cylinders with oversize piston rings.
Piston Skirt Diameter
Measure the outer diameter of piston skirt with micrometer.
Piston to Cylinder Bore Clearance
Calculate by piston skirt diameter and cylinder bore inner diameter (direction ?Y?, position ?B?).
(Clearance) = (Cylinder bore inner diameter) ? (Piston skirt diameter).
? If calculated value exceeds the limit, replace piston and piston pin assembly. Refer to EM-153, "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.
Standard inner diameter:
95.500 - 95.530 mm (3.7598 - 3.7610 in)
0.2 mm (0.008 in)
Out-of-round (Difference between ?X? and ?Y?):
0.015 mm (0.0006 in)
Taper limit (Difference between ?A? and ?C?):
0.01 mm (0.0004 in)
Oversize (OS) : 0.2 mm (0.008 in)
: Distance from the top 41.0 mm (1.614 in)
: 95.480 - 95.510 mm (3.7590 - 3.7602 in)
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
D: Bored diameter
A: Piston skirt diameter as measured