Nissan Altima L32. Manual - part 627

EM-44

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CAMSHAFT

1. Measure the camshaft cam height.

2. If wear is beyond the limit, replace the camshaft.

Camshaft Journal Clearance

Outer Diameter of Camshaft Journal

• Measure the outer diameter of the camshaft journal.

Inner Diameter of Camshaft Bracket

• Tighten the camshaft bracket bolts to the specified torque following

the tightening pattern as shown. 

CAUTION:

After tightening camshaft bracket bolts, be sure to wipe off

excessive sealant from the parts listed below. 

• Mating surface of rocker cover.

• Mating surface of front cover, when installed without the front cover.

• Using inside micrometer, measure inner diameter of camshaft

bracket.

Calculation of Camshaft Journal Clearance

• (Journal clearance) = (inner diameter of camshaft bracket) – (outer diameter of camshaft journal)

• When out of the specified range above, replace either or both the camshaft and the cylinder head assembly.

Standard intake cam height

: 44.815 - 45.005 mm 
(1.7644 - 1.7718 in)

Standard exhaust cam height

: 43.975 - 44.165 mm 
(1.7313 - 1.7388 in)

PBIC0039E

Standard No.1 outer di-
ameter

: 27.935 - 27.955 mm
(1.0998 - 1.1006 in)

Standard No.2, 3, 4, 5, 
outer diameter

: 23.435 - 23.455 mm
(0.9226 - 0.9234 in)

PBIC0040E

Step 1 (bolts 9 - 11) : 1.96 N·m (0.2 kg-m, 17 in-lb)
Step 2 (bolts 1 - 8)

: 1.96 N·m (0.2 kg-m, 17 in-lb)

Step 3 (bolts 1 - 11) : 5.88 N·m (0.6 kg-m, 52 in-lb)
Step 4 (bolts 1 - 11) : 10.4 N·m (1.02 kg-m, 92 in-lb)

SBIA0255E

Standard 
No.1

: 28.000 - 28.021 mm (1.1024 - 1.1032 in)

Standard 
No.2, 3, 4, 5

: 23.500 - 23.521 mm (0.9252 - 0.9260 in)

PBIC0041E

Standard

: 0.045 - 0.086 mm (0.0018 - 0.0034 in)

CAMSHAFT

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NOTE:

Inner diameter of the camshaft bracket is manufactured together with the cylinder head. If the camshaft

bracket is out of specification, replace the whole cylinder head assembly.

Camshaft End Play

1. Install a dial gauge in the thrust direction on the front end of the

camshaft. Measure the end play with the dial gauge while mov-

ing the camshaft forward and backward (in direction to axis).

2. If out of the specified range, replace with new camshaft and

measure again.

3. If out of the specified range again, replace with new cylinder

head assembly.

Camshaft Sprocket Runout

1. Install the camshaft in the cylinder head.
2. Install the camshaft sprocket on the camshaft.
3. Measure camshaft sprocket runout while turning the camshaft

by hand.

4. If it exceeds the specification, replace camshaft sprocket.

Valve Lifter 

• Check if the surface of the valve lifter has any excessive wear or

cracks, replace as necessary.

Valve Lifter Clearance

Outer Diameter of Valve Lifter

• Measure the outer diameter of the valve lifter.

• If out of the specified range, replace the valve lifter.

Standard end 
play

: 0.115 - 0.188 mm (0.0045 - 0.0074 in)

PBIC0042E

Runout

: Less than 0.15 mm (0.0059 in)

KBIA0181J

KBIA0182E

Valve lifter out-
er diameter

: 33.977- 33.987 mm (1.3377 - 1.3381 in)

JEM798G

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CAMSHAFT

Valve Lifter Bore Inner Diameter

• Using inside micrometer, measure diameter of valve lifter bore of

cylinder head.

• If out of the specified range, replace the cylinder head assembly.

Calculation of Valve Lifter Clearance

• (Valve lifter clearance) = (hole diameter for valve lifter) – (outer diameter of valve lifter)

• If out of specified range, replace either or both valve lifter and cylinder head assembly.

INSTALLATION

1. Install the valve lifter.

• Install them in the same position from which they were removed.

2. Install the camshafts.

• The distinction between the intake and exhaust camshafts is in

a difference of shapes of the back end:

• A:  Exhaust

• B: Intake Signal plate for the camshaft position sensor

(PHASE) 

• Install camshafts so that the dowel pins on the front side are

positioned as shown.

3. Install camshaft brackets.

• Install by referring to identification mark on upper surface

mark.

• Install so that identification mark can be correctly read when

viewed from the exhaust side.

Standard

: 34.000 - 34.021 mm (1.3386 - 1.3394 in)

PBIC0043E

Standard

: 0.013 - 0.044 mm (0.0005 - 0.0017 in)

AWBIA0201ZZ

KBIA0051E

SBIA0256E

CAMSHAFT

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• Install No. 1 camshaft bracket as follows.

- Apply sealant to No.1 camshaft bracket as shown.

• Use Genuine Silicone RTV Sealant, or equivalent. Refer to

GI-15, "Recommended Chemical Products and Sealants"

.

CAUTION:

• After installation, be sure to wipe off any excessive seal-

ant leaking from part (A) (both on right and left sides).

• Apply sealant to camshaft bracket contact surface on the front

cover backside.

• Apply sealant to the outside of bolt hole on front cover.

• Position the No.1 camshaft bracket near the mounting posi-

tion, and install it without disturbing the sealant applied to the

surfaces.

4. Tighten camshaft bracket bolts in four steps in the order as

shown.

CAUTION:

After tightening camshaft bracket bolts, be sure to wipe off

excessive sealant from the parts listed below. 

• Mating surface of rocker cover.

• Mating surface of front cover, when installed without the front cover.

SBIA0257E

Dimension (A)

: 3.9 mm (0.154 in)

AWBIA0062ZZ

SBIA0259E

Step 1 (bolts 9 - 11) : 1.96 N·m (0.2 kg-m, 17 in-lb)
Step 2 (bolts 1 - 8)

: 1.96 N·m (0.2 kg-m, 17 in-lb)

Step 3 (bolts 1 - 11) : 5.88 N·m (0.6 kg-m, 52 in-lb)
Step 4 (bolts 1 - 11) : 10.4 N·m (1.02 kg-m, 92 in-lb)

SBIA0255E