Piston-To-Cylinder Bore Clearance

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

Using a bore gauge, measure cylinder bore for wear, out-of-round and taper at (A), (B) and (C). The X axis is in the longitudinal direction of the engine.

CYLINDER BORE INNER DIAMETER

Grade No.	Standard inner diameter	Wear limit
No. 1	95.500 - 95.510 mm (3.7598 - 3.7602 in)	0.20 mm (0.0079 in)
No. 2	95.510 - 95.520 mm (3.7602 - 3.7606 in)
No. 3	95.520 - 95.530 mm (3.7606 - 3.7610 in)

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If it exceeds the limit, rebore all cylinders. Replace cylinder block if necessary.

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Out-of-round (Difference between X and Y)	: limit 0.015 mm (0.0006 in)
Taper (Difference between A and C)	: limit 0.010 mm (0.0004 in)

Check for scratches and seizure. If seizure is found, hone it.

Courtesy of NISSAN NORTH AMERICA, INC.
- If both cylinder block and piston are replaced with new ones, select piston of the same grade number punched on cylinder block rear position. These numbers are punched in either Arabic or Roman numerals.

Measure piston skirt diameter.

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Piston diameter (A)	: Refer to CYLINDER BLOCK .
Measuring point (a) (Distance from the top)	: 38.0 mm (1.496 in)

Check that piston-to-bore clearance is within specification.

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Piston-to-bore clearance at (B) : 0.010 - 0.030 mm (0.0004 - 0.0012 in)
- The piston-to-bore clearance is measured at the (B) level in the cylinder as shown in illustration.

Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter (A).

Rebored size calculation	: D = A + B - C
where,
(D)	: Bored diameter
(A)	: Piston diameter as measured
(B)	: Piston-to-bore clearance
(C)	: Honing allowance 0.02 mm (0.0008 in)

Install main bearing caps, and tighten to the specified torque. Otherwise, cylinder bores may be distorted after boring.
Cut cylinder bores.
- 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.
Hone cylinders to obtain specified piston-to-bore clearance.
Measure finished cylinder bore for out-of-round and taper.
- Measurement should be done after cylinder bore cools down.