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Nissan Frontier D22. Manual - part 684

CYLINDER HEAD

EM-43

[KA24DE]

Valve Clearance

EBS00GSM

CHECKING

Check valve clearance while engine is warm but not running.

Remove the following parts:

●

Rocker cover

●

All spark plugs

Set No. 1 cylinder at TDC on its compression stroke.

●

Align pointer with TDC mark on crankshaft pulley.

●

Check that valve lifters on No. 1 cylinder are loose and valve
lifters on No. 4 are tight.
If not, turn crankshaft one revolution (360

°) and align as

above.

Check only those valves as shown.

Using a feeler gauge, measure clearance between valve lifter
and camshaft.

●

Record any valve clearance measurements which are out of
specification. They will be used later to determine the required
replacement adjusting shim.

Turn crankshaft one revolution (360

° degrees) and align mark on crankshaft pulley with pointer.

Check only those valves as shown.

●

Use the same procedure as described in step 4.

If all of the valve clearances are within specification, install the following parts:

●

Rocker cover

●

All spark plugs

WEM068

AEM382

Valve clearance (hot)

Intake

: 0.31 - 0.39 mm (0.012 - 0.015 in)

Exhaust

: 0.39 - 0.47 mm (0.015 - 0.019 in)

SEM304D

AEM383

EM-44

[KA24DE]

CYLINDER HEAD

ADJUSTING

CAUTION:

Adjust the valve clearance while engine is cold.

Turn the crankshaft to position the camshaft lobe on the valve that must be adjusted upward.

Place Tool (A) around camshaft as shown.

CAUTION:

Before placing Tool (A), rotate notch toward the center of
the cylinder head as shown, to simplify the shim removal.

Rotate Tool (A) so that lifter is pushed down.

CAUTION:

Be careful not to damage the cam surface with Tool (A).

Place Tool (B) between camshaft and the edge of the valve lifter
to retain valve lifter.

CAUTION:

●

Tool (B) must be placed as close to camshaft bracket as
possible.

●

Be careful not to damage cam surface with Tool (B).

Remove Tool (A).

Rotate the adjusting shim until a hole is visible. Blow air into the
hole to separate the adjusting shim from the valve lifter.

Remove the adjusting shim using a small screwdriver and a
magnetic finger or suitable tool.

SEM515EA

SEM516EA

AEM447

SEM517EA

CYLINDER HEAD

EM-45

[KA24DE]

Calculate the replacement adjusting shim size.

Using a micrometer to determine the thickness of the removed
adjusting shim.

Calculate the thickness of the new adjusting shim so that the valve clearance comes within the specified
values.
N = Thickness of new shim
R = Thickness of removed shim
M = Measured valve clearance

Select a new adjusting shim with the thickness as close as pos-
sible to the calculated value "N".
Refer to

EM-65, "AVAILABLE SHIMS"

NOTE:
Shims are available in thicknesses from 1.96 - 2.68 mm (0.0772
- 0.1055 in), in increments of 0.02 mm (0.0008 in). The adjusting
shim thickness is stamped on the bottom of the adjusting shim
as shown.

Install the new adjusting shim using a suitable tool.

CAUTION:

Install the adjusting shim with the surface on which the
thickness is stamped facing down.

10. Place Tool (A) as described in steps 2 through 4.

11. Remove Tool (B).

12. Remove Tool (A).

13. Recheck the valve clearance. Refer to

EM-43, "Valve Clearance"

SEM145D

Intake and exhaust shim calculation

: N = R + [M

− 0.37 mm (0.0146 in)]

SEM308D

SEM518EA

EM-46

[KA24DE]

ENGINE ASSEMBLY

PFP:10001

Removal and Installation

EBS00GSN

WARNING:

●

Position vehicle on a flat and solid surface.

●

Place chocks at front and back of rear wheels.

●

Do not remove engine until exhaust system has completely cooled off. Otherwise, you may burn
yourself and/or fire may break out in fuel line.

●

Before disconnecting fuel hose, release fuel pressure. Refer to

EC-46, "FUEL PRESSURE

RELEASE"

●

Be sure to hoist engine and transmission in a safe manner.

●

For engines not equipped with engine slingers, attach proper slingers and bolts described in
PARTS CATALOG.

WEM055

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