Nissan Titan. Instruction — part 304
EM-20
< PERIODIC MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
6. Measure valve clearances at the locations marked “
×” as shown
in the table below (locations indicated with black arrow).
NOTE:
Firing order 1-8-7-3-6-5-4-2
• No. 1 cylinder compression TDC
• Measure valve clearance using suitable tool. Refer to
CAUTION:
If the inspection was carried out with a cold engine, make
sure the values with a fully warmed up engine are still
within specifications.
7. Turn the crankshaft pulley clockwise 270
° from the position of No. 1 cylinder compression TDC to obtain
No. 3 cylinder compression TDC.
: Engine front
: Measurable at No.1 cylinder compression top dead center (black)
: Measurable at No. 3 cylinder compression top dead center (white)
(A)
: (RH)
(B)
: (LH)
(C)
: Exhaust
(D)
: Intake
Measuring position (RH bank)
No. 2 cyl
(E)
No. 4 cyl
(F)
No. 6 cyl
(G)
No. 8 cyl
(H)
No. 1 cylinder at TDC
EXH
×
INT
×
×
Measuring position (LH bank)
No. 1 cyl
(J)
No. 3 cyl
(K)
No. 5 cyl
(L)
No. 7 cyl
(M)
No. 1 cylinder at TDC
INT
×
×
EXH
×
×
WBIA0713E
KBIA0185E
CAMSHAFT VALVE CLEARANCE
EM-21
< PERIODIC MAINTENANCE >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
8. Measure valve clearances at the locations marked “
×” as shown
in the table below (locations indicated with white arrow).
NOTE:
Firing order 1-8-7-3-6-5-4-2
• No. 3 cylinder compression TDC
• Measure valve clearance using suitable tool. Refer to
CAUTION:
If the inspection was carried out with a cold engine, make
sure the values with a fully warmed up engine are still
within specifications.
: Engine front
: Measurable at No.1 cylinder compression top dead center (black)
: Measurable at No. 3 cylinder compression top dead center (white)
(A)
: (RH)
(B)
: (LH)
(C)
: Exhaust
(D)
: Intake
Measuring position (RH bank)
No. 2 cyl
(E)
No. 4 cyl
(F)
No. 6 cyl
(G)
No. 8 cyl
(H)
No. 3 cylinder at TDC
EXH
×
INT
×
Measuring position (LH bank)
No. 1 cyl
(J)
No. 3 cyl
(K)
No. 5 cyl
(L)
No. 7 cyl
(M)
No. 3 cylinder at TDC
INT
×
×
EXH
×
×
WBIA0713E
KBIA0185E
EM-22
< PERIODIC MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
9. Turn the crankshaft pulley clockwise 90
° from the position of No.
3 cylinder compression TDC (clockwise by 360
° from the posi-
tion of No. 1 cylinder compression TDC) to measure the intake
and exhaust valve clearances of No. 6 cylinder (G) and the
exhaust valve clearance of No. 2 cylinder (E).
10. If out of specifications, adjust as necessary.
ADJUSTMENT
NOTE:
• Perform adjustment depending on the selected head thickness of the valve lifter.
• The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differences
caused by temperature. Use the specifications for hot engine condition to adjust.
1. Remove the camshaft. Refer to
EM-62, "Removal and Installation"
.
2. Remove the valve lifters at the locations that are out of specification.
3. Measure the center thickness of the removed valve lifters using
suitable tool.
4. Use the equation below to calculate the valve lifter thickness for
replacement.
• Valve lifter thickness calculation:
Thickness of replacement valve lifter = t1+ (C1 - C2)
t1 = Thickness of removed valve lifter
C1 = Measured valve clearance
C2= Standard valve clearance:
• Thickness of a new valve lifter can be identified by stamp
marks on the reverse side (inside the cylinder).
Stamp mark N788 indicates 7.88 mm (0.3102 in) in thickness.
• Available thickness of valve lifter: 25 sizes with range 7.88 to
8.36 mm (0.3102 to 0.3291 in) in steps of 0.02 mm (0.0008 in)
(when manufactured at factory). Refer to
5. Install the selected valve lifter.
: Engine front
(A)
: (RH)
(B)
: (LH)
(C)
: Exhaust
(D)
: Intake
(E)
: No. 2 cylinder
(F)
: No. 4 cylinder
(G)
: No. 6 cylinder
(H)
: No. 8 cylinder
(J)
: No. 1 cylinder
(K)
: No. 3 cylinder
(L)
: No. 5 cylinder
(M)
: No. 7 cylinder
WBIA0713E
KBIA0057E
KBIA0119E
CAMSHAFT VALVE CLEARANCE
EM-23
< PERIODIC MAINTENANCE >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
6. Install the camshaft.
7. Instructionly turn the crankshaft pulley a few turns.
8. Make sure the valve clearances for a cold engine are within specifications. Refer to
.
9. After completing the repair, check the valve clearances again with the specifications for a warmed engine.
Make sure the values are within specifications. Refer to
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст