Nissan Versa (N17): How to select piston and bearing

Description

Selection points	Selection parts	Selection items	Selection methods
Between cylinder block and crankshaft	Main bearing	Main bearing grade (bearing thickness)	Determined by match of cylinder block bearing housing grade (inner diameter of housing) and crankshaft journal grade (outer diameter of journal)
Between crankshaft and connecting rod	Connecting rod bearing	Connecting rod bearing grade (bearing thickness)	Combining service grades for connecting rod big end diameter and crankshaft pin outer diameter determine connecting rod bearing selection.

• The identification grade stamped on each part is the grade for the dimension measured in new condition.

  This grade cannot apply to reused parts.

• For reused or repaired parts, measure the dimension accurately. Determine the grade by comparing the measurement with the values of each selection table.
• For details of the measurement method of each part, the reuse standards and the selection method of the selective fitting parts, refer to the text for the appropriate part.

Connecting Rod Bearing

WHEN NEW CONNECTING ROD AND CRANKSHAFT ARE USED

    1.   Apply connecting rod big end diameter grade stamped (C) on connecting rod side face to the row in the "Connecting Rod Bearing Selection Table".

(A) : Oil hole

(B) : Cylinder number

(D) : Front mark

    2.   Apply crankshaft pin journal diameter grade stamped on crankshaft front side to the column in the "Connecting Rod Bearing Selection Table".

(A) : Main journal diameter grade (No. 1 to 5 from left)

(B) : Crankshaft pin journal diameter grade (No. 1 to 4 from left)

    3.   Read the symbol at the cross point of selected row and column in the "Connecting Rod Bearing Selection Table".

    4.   Apply the symbol obtained to the "Connecting Rod Bearing Grade Table" to select connecting rod bearing.

WHEN CONNECTING ROD AND CRANKSHAFT ARE REUSED

1. Measure the dimensions of the connecting rod big end diameter and crankshaft pin journal diameter individually.
2. Apply the measured dimension to the "Connecting Rod Bearing Selection Table".
3. Read the symbol at the cross point of selected row and column in the "Connecting Rod Bearing Selection Table".
4. Apply the symbol obtained to the "Connecting Rod Bearing Grade Table" to select connecting rod bearing

Connecting Rod Bearing Selection Table

Connecting Rod Bearing Grade Table

Undersize Bearings Usage Guide

• When the specified connecting rod bearing oil clearance is not obtained with standard size connecting rod bearings, use undersize (US) bearings.
• When using undersize (US) bearing, measure the connecting rod bearing inner diameter with bearing installed, and grind the crankshaft pin so that the connecting rod bearing oil clearance satisfies the standard.

CAUTION:

In grinding crankshaft pin to use undersize bearings, keep the fillet R (A) [0.8 1.2 mm (0.031 0.047 in)].

Main Bearing

HOW TO SELECT MAIN BEARING

When New Cylinder Block and Crankshaft Are Used

    1.   "Main Bearing Selection Table" rows correspond to main bearing housing grade on left side of cylinder block.

(A) : Basic stamp mark

  : Engine front

• If there is a corrected stamp mark (B) on cylinder block, use it as a correct reference.

    2.   Apply main journal diameter grade stamped on crankshaft front side to column in the "Main Bearing Selection Table".

(A) : Main journal diameter grade (No. 1 to 5 from left)

(B) : Crankshaft pin journal diameter grade (No. 1 to 4 from left)

    3.   Read the symbol at the cross point of selected row and column in the "Main Bearing Selection Table".

    4.   Apply the symbol obtained to the "Main Bearing Grade Table" to select main bearing.

NOTE:

Service part is available as a set of both upper and lower.

When Cylinder Block and Crankshaft Are Reused

1. Measure the dimensions of the cylinder block main bearing housing inner diameter and crankshaft main journal diameter individually.
2. Apply the measured dimension to the "Main Bearing Selection Table".
3. Read the symbol at the cross point of selected row and column in the "Main Bearing Selection Table".
4. Apply the symbol obtained to the "Main Bearing Grade Table" to select main bearing.

Main Bearing Selection Table

Main Bearing Grade Table

Use Undersize Bearing Usage Guide

• When the specified main bearing oil clearance is not obtained with standard size main bearings, use undersize (US) bearing.
• When using undersize (US) bearing, measure the main bearing inner diameter with bearing installed, and grind main journal so that the main bearing oil clearance satisfies the standard.

CAUTION:

In grinding crankshaft main journal to use undersize bearings, keep fillet (A) [0.8 1.2 mm (0.031 0.047 in)].