Inspection After Disassembly

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

To avoid the risk of injury to eyes and skin, when using caustic solutions, solvents, acids, or alkaline materials follow the manufacturer's recommendations for use and wear appropriate eye protection and protective clothing. Some of these materials are also flammable. To avoid risk of fire or burns, never smoke or allow sparks or flames (such as pilot lights, electrical switches, or welding equipment) in the work area. Avoid spilling onto a hot exhaust manifold which can cause a fire.
When using high-pressure water or steam cleaning equipment, to avoid the risk of personal injury from flying debris and hot steam:
- Wear appropriate eye protection and protective clothing including gloves and a face shield.
When using compressed air for cleaning, to avoid the risk of personal injury from flying debris and dirt:
- Do not exceed 207 kPa (2.111 kg/cm ² , 30 psi).
- Wear appropriate eye protection and protective clothing including gloves.

NOTE:

Use steam or solvent to clean the flywheel housing.
Dry with compressed air.

Flywheel Housing

Inspect the flywheel housing for cracks.
Inspect the flywheel housing transmission/drive unit mounting surface for cracks.
Also inspect for damaged threads commonly caused by cross-threaded bolts or installing an incorrect bolt.
NOTE: If thread damage is found, repair threads or replace component as required.

Cylinder Block

Inspect the rear face of the cylinder block and flywheel housing mounting surface for cleanliness and raised nicks or burrs. Use fine crocus cloth to remove small nicks and burrs.
Thoroughly clean the flywheel housing and cylinder block mating surfaces. These surfaces must be clean of oil and debris.

MEASURE

Install the flywheel housing and hand-tighten bolts in the sequence shown but do not torque the bolts.

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NOTE: Follow this step only if the flywheel housing is being replaced or if troubleshooting a vibration/alignment issue. It is not necessary to measure bore alignment or face alignment when installing the original flywheel housing unless the dowel rings were removed during a previous repair.

FACE ALIGNMENT

Attach the suitable tool (B) to the crankshaft (1).

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CAUTION: To avoid possible damage to the dial indicator, ensure the dial indicator tip does not enter the bolt hole.
NOTE:
- Face alignment is determined by calculating the total indicator reading (TIR).
- The suitable tool can be mounted by any method that holds the extension bar of the indicator rigid, so it does not sag. If the bar sags or the indicator (C) slips, the readings obtained will not be accurate.
Position the suitable tool at the 12 o'clock position, and zero the gauge (A).
NOTE: The crankshaft must be pushed toward the front of the engine to remove the crankshaft end clearance each time a position is measured.
Use the Tool to slowly rotate the crankshaft and record the readings at positions (A), (B) and (C).

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NOTE: The values for (A), (B), and (C) can be positive or negative.

Tool

:-- - (J-54424)

(D)

: Suitable tool
Continue to rotate the crankshaft (1) until the suitable tool (A) is at the 12-o'clock position (B) and check the suitable tool to make sure the needle points to zero. If it does not, the readings will be incorrect and the procedure will have to be repeated.

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Determine the TIR.

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NOTE:

TIR is determined by calculating the difference between the highest and lowest measurement from the four locations measured.
As the example below illustrates, the TIR is:
- + 0.08 mm (0.003 in) - (-0.05 mm [-0.002 in]) = 0.13 mm (0.005 in)

(A)	0.00 mm (0.000 in)
(B)	+ 0.08 mm (+ 0.003 in)
(C)	- 0.05 mm (- 0.002 in)
(D)	+ 0.08 mm (+ 0.003 in)
Equals TIR	0.13 mm (0.005 in)

The maximum allowable TIR is determined by the diameter of the housing bore. If out of specifications, replace the flywheel housing.

Maximum allowable total Indicator Reading

: 0.25 mm (0.010 in)

BORE ALIGNMENT

Attach the suitable tool (B) to the crankshaft (1).

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NOTE: The suitable tool (B) can be attached by any method that holds the extension bar (C) of the suitable tool (A) rigid, so it does not sag. If the suitable tool (B) sags or the suitable tool (A) slips, the readings obtained will not be accurate.
Position the suitable tool (A) in the 6 o'clock position, and zero the suitable tool.
Slowly rotate the crankshaft with Tool (C). Record the readings obtained at the positions (A), (B) and (E) in the concentricity work sheet.

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NOTE:
- Check zero at the position (D). If it does not, the readings will be incorrect and the procedure will have to be redone.
- The values for (A), (B), and (E) can be positive or negative. See the accompanying figure to determine the correct sign when recording these values.
Tool

:-- - (J-54424)
Rotate the crankshaft to position (A) and zero the gauge.

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CAUTION: To avoid possible engine damage, do not pry against the fly wheel, do not force crankshaft beyond the point where all bearing clearance has been removed. These actions could cause false bearing clearance readings.
Using a suitable tool, raise the rear of the crankshaft to its upper limit. Record the value as position (C) on the concentricity work sheet. This is the vertical bearing clearance adjustment, which will always be positive.

Create a concentricity work sheet as shown to determine the values for the total vertical and total horizontal values.

NOTE: The values listed in the concentricity work sheet illustrated are for example only. The actual numbers measured may differ.

Input the values recorded for (A), (B), (C) and (D) into the concentricity work sheet.
The total horizontal is position (D) minus position (B).
The total vertical is position (A) plus position (C).

Concentricity Worksheet
Position (D)	0.10 mm (0.004 in)
Position (B)	- 0.05 mm (-0.002 in)
Total Horizontal (D - B)	0.15 mm (0.006 in)
Position (A)	0.08 mm (0.003 in)
Position (C)	0.05 mm (0.002 in)
Total Horizontal (A + C)	0.13 mm (0.005 in)

Using the total horizontal and total vertical values from the previous example, the intersection point falls within the shaded area. Therefore, the flywheel housing concentricity is within specification.

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NOTE:
- Using the illustration, mark the total horizontal value (B) on the X-axis of the chart and the total vertical (A) on the Y-axis of the chart.
- Use a straightedge to find the intersection point of the total horizontal and total vertical values. The intersection point must fall within the shaded area for the flywheel housing concentricity to be within specification.
If the bore alignment is out of specification:
- Determine if the flywheel housing or cylinder block has recently been replaced. If any of these components have been replaced, remove and inspect/replace the component.
- If the flywheel housing or cylinder block have not been recently replaced. Remove the flywheel housing. Inspect the cylinder block and flywheel housing mounting surfaces.
Install the flywheel housing and hand-tighten bolts (B) and (C) but do not torque the bolts.

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Check the bore alignment. If the bore alignment is not within specifications, lightly tap the flywheel housing with suitable tool (A) and measure bore alignment.

Bolt (B)		: M12
Bolt (C)		: M10

When bore alignment is within specification, tighten the bolts (A) in the sequence shown.

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Bolt No. 4, 6, 8, 10		: 80 N.m (8.2 kg-m, 59 ft-lb)
Bolt No. 1, 2, 3, 5, 7, 9		: 36 N.m (3.7 kg-m, 27 ft-lb)