Nissan Sentra manuals

Nissan Sentra Service Manual: 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.
Between cylinder block and piston Piston and piston pin assembly (piston is available together with piston pin as an assembly.) Piston grade (piston outer diameter) Piston grade = cylinder bore grade (inner diameter of bore)

Piston

When new cylinder block is used

  1. Correction stamp
  2. Standard stamp
  3. Cylinder No. 1 bore grade
  4. Cylinder No. 2 bore grade
  5. Cylinder No. 3 bore grade
  6. Cylinder No. 4 bore grade
  7. No. 1 main bearing housing grade
  8. No. 2 main bearing housing grade
  9. No. 3 main bearing housing grade
  10. No. 4 main bearing housing grade
  11. No. 5 main bearing housing grade

When cylinder block is reused


When cylinder block is reused

  1. Measure the cylinder bore inner diameter. Refer to EM-123, "Cylinder Block".
  2. Determine the bore grade by comparing the measurement with the values under the cylinder bore inner diameter of the “Piston Selection Table”.
  3. Select piston of the same grade.
  1. Piston grade number
  2. Front mark
  3. Identification code

Piston selection table


Piston selection table

NOTE:


NOTE:

Piston is available together with piston pin as an assembly.

Connecting Rod Bearing

When new connecting rod and crankshaft are used

  1. Apply connecting rod big end diameter grade stamped on connecting rod side face to the row in the “Connecting Rod Bearing Selection Table”.
  1. Oil hole
  2. Engine type
  3. Cylinder number
  4. Big end diameter grade
  5. Front mark


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

No. 1 pin journal diameter grade

No. 2 pin journal diameter grade

No. 3 pin journal diameter grade

No. 4 pin journal diameter grade

No. 1 main journal diameter grade

No. 2 main journal diameter grade

No. 3 main journal diameter grade

No. 4 main journal diameter grade

No. 5 main journal diameter grade


  1. Read the symbol at the cross point of selected row and column in the “Connecting Rod Bearing Selection Table”.
  2. 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.

    Refer to em-103, "inspection".

  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


Connecting rod bearing grade table

Connecting rod bearing grade table : Refer to EM-127, "Connecting Rod Bearing".

Undersize bearings usage guide

Caution:

In grinding crankshaft pin to use undersize bearings, keep the fillet r [1.5 - 1.7 Mm (0.059 - 0.067 In)] (a).

Bearing undersize table : refer to em-127, "connecting rod bearing".

Main Bearing


Main Bearing

When new cylinder block and crankshaft are used

  1. “Main Bearing Selection Table” rows correspond to main bearing housing grade on rear (LH) side of cylinder block (L).
  1. Correction stamp
  2. Standard stamp
  3. Cylinder No. 1 bore grade
  4. Cylinder No. 2 bore grade
  5. Cylinder No. 3 bore grade
  6. Cylinder No. 4 bore grade
  7. No. 1 main bearing housing grade
  8. No. 2 main bearing housing grade
  9. No. 3 main bearing housing grade
  10. No. 4 main bearing housing grade
  11. No. 5 main bearing housing grade


  1. Apply main journal diameter grade stamped on crankshaft front side to column in the “Main Bearing Selection Table”.
  1. No. 1 pin journal diameter grade
  2. No. 2 pin journal diameter grade
  3. No. 3 pin journal diameter grade
  4. No. 4 pin journal diameter grade
  5. No. 1 main journal diameter grade
  6. No. 2 main journal diameter grade
  7. No. 3 main journal diameter grade
  8. No. 4 main journal diameter grade
  9. No. 5 main journal diameter grade


  1. Read the symbol at the cross point of selected row and column in the “Main Bearing Selection Table”.

CAUTION:

There are two main bearing selection tables. One is for No. 1, 4, and 5 journals and the other is for No. 2 and 3 journals. Make certain to use the appropriate table. This is due to differences in the specified clearances.

  1. 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. Refer to EM-103, "Inspection".
  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”.

CAUTION:

There are two main bearing selection tables. One is for No. 1, 4, and 5 journals and the other is for No. 2 and 3 journals. Make certain to use the appropriate table. This is due to differences in the specified clearances.

  1. 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.

Main bearing selection table(No. 1, 4, AND 5 JOURNAL)

Main bearing selection table (no. 2 And 3 journal)


Main bearing selection table (no. 2 And 3 journal)

Main bearing grade table(ALL JOURNALS)


Main bearing grade table(ALL JOURNALS)

Main bearing grade table (All journals) : Refer to EM-127, "Main Bearing".

Undersize bearing usage guide

CAUTION:

In grinding crankshaft main journal to use undersize bearings, keep the fillet R [1.5 - 1.7 mm (0.059 - 0.067 in)] (A).

Bearing undersize table: Refer to EM-127, "Main Bearing".

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