Infiniti F50. Manual - part 540

CAMSHAFT

EM-47

Loosen fixing bolts in the reverse order of that shown in figure to
remove camshaft brackets.

●

Lightly tapping with plastic hammer, remove No. 1 camshaft
bracket and No. 6 camshaft bracket.
NOTE:
The bottom surface of each bracket will be stuck to cylinder
head because of liquid gasket.

Remove camshaft.

Remove adjusting shims and valve lifters if necessary.

●

Correctly identify location where each part is installed. Keep
parts in an organized way to avoid mixing them up.

INSTALLATION

Install adjusting shims and valve lifters if necessary.

●

Install removed parts in the same locations as before.

Install camshafts. Refer to the table below for identification of
right and left bank, and intake and exhaust.

●

Install so that dowel pin at the front of camshaft face is in the
direction shown in the figure.

PBIC0031E

Bank

IN/EX

Identifica-

tion paint

(front)

Identifica-

tion paint

(rear)

Identifica-

tion rib

Identifica-

tion sym-

bol

Blue

—

No.

EXH

—

Orange

No.

INT

Blue

—

Yes.

EXH

—

Orange

Yes.

PBIC0032E

SBIA0366E

EM-48

CAMSHAFT

Install camshaft brackets.

●

Install by referring to identification mark on upper surface and
front mark.

●

Install so that identification mark can be correctly read when
viewed from the side of left exhaust bank.

●

Install No. 1 camshaft bracket as follow:

–

Apply liquid gasket to No.1 camshaft bracket as in illustration.
Use Genuine RTV Silicone Sealant or equivalent. Refer to

CAUTION:

●

After installation, be sure to wipe off any excessive liq-
uid gasket leaking from part “A” and “B”(both on right
and left sides).

●

Remove completely any excess of liquid gasket inside
bracket.

●

Apply liquid gasket to No.6 camshaft bracket on left bank
intake as in illustration.

CAUTION:

●

After installation, be sure to wipe off any excessive liq-
uid gasket leaking from part “A”, and “ B”(both on
right and left sides).

●

Remove completely any excess of liquid gasket inside
bracket.

PBIC0034E

PBIC0035E

PBIC0036E

CAMSHAFT

EM-49

Tighten fixing bolts of camshaft brackets as follows:

Tighten in the order from 9 to 12 with tightening torque 1.96 N·m
(0.2 kg-m, 17 in-lb).

Tighten in the order from 1 to 8 with tightening torque 1.96 N·m
(0.2 kg-m, 17 in-lb).

Tighten in the order from 13 to 14 with tightening torque 1.96
N·m (0.2 kg-m, 17 in-lb) (Left bank only).

Tighten all bolts in the specified order with tightening torque 5.88
N·m (0.6 kg-m, 52 in-lb)

Tighten in the order from 1 to 12 with tightening torque 9.02 to
11.8N·m (0.92 to 1.2 kg-m, 80 to 104 in-lb).

Tighten in the order from 13 to 14 with tightening torque 29.4 to
33.3 N·m (3.0 to 3.3 kg-m, 22 to 24 ft-lb) (left bank only).

CAUTION:

After tightening fixing bolts of camshaft brackets, be sure
to wipe off excessive liquid gasket from the parts listed
below.

●

Mating surface of rocker cover

●

Mating surface of front cover

Install camshaft sprockets.

●

Install by checking with identification mark on surface.

●

Install exhaust-side camshaft sprocket by selectively using
the groove of dowel pin according to the bank. (Common part
used for both banks.)

●

Lock the hexagonal part of camshaft in the same way as for
removal, and tighten fixing bolts.

For the following operations, perform steps in the reverse order
of removal.

Check and adjust valve clearances.
Refer to

EM-52, "Valve Clearance"

INSPECTION AFTER REMOVAL
Camshaft Runout

Put V block on precise flat bed, and support No.2 and No.5 jour-
nal of camshaft.

Set dial gauge vertically to No.3 journal.

Turn camshaft to one direction with hands, and measure cam-
shaft runout on dial gauge.

●

1/2 of runout is bend.

If it exceeds the specification, replace camshaft.

PBIC0031E

PBIC0037E

Standard

: Less than 0.02 mm (0.0008 in)

SBIA0367E

EM-50

CAMSHAFT

Camshaft Cam Height

Measure camshaft cam height.

If wear is beyond the specifications, replace camshaft.

Camshaft Journal Clearance

Outer Diameter of Camshaft Journal
Measure outer diameter of camshaft journal.

Inner Diameter of Camshaft Bracket

●

Tighten camshaft bracket bolt with specified torque.

●

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 camshaft and cylinder head.

NOTICE:
Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylinder
head assembly.

Camshaft End Play

●

Install dial gauge in thrust direction on front end of camshaft.
Measure end play when camshaft is moved forward/backward
(in direction to axis).

●

When out of the specified range, replace with new camshaft and
measure again.

●

When out of the specified range again, replace with new cylinder
head.

Standard cam height:

Intake: 44.865 - 45.055 mm (1.7663 - 1.7738 in)

Exhaust: 43.925 - 44.115 mm (1.7293 - 1.7368 in)

PBIC0039E

Standard outer diameter:

No.1: 25.938 - 25.955 mm (1.0212 - 1.0218 in)

No.2, 3, 4, 5: 25.953 - 25.970 mm (1.0218 - 1.0224 in)

PBIC0040E

Standard:

26.000 - 26.021 mm (1.0236 - 1.0244 in)

Standard:

No.1

: 0.045 - 0.083 mm (0.0018 - 0.0033 in)

No.2, 3, 4, 5

: 0.030 - 0.068 mm (0.0012 - 0.0027 in)

PBIC0041E

Standard:

0.115 - 0.188 mm (0.0045 - 0.0074 in)

PBIC0042E

Content .. 538 539 540 541 ..