Nissan Almera Tino V10. Manual — part 847
EM-44
[QG]
CAMSHAFT
●
Measure outer diameter with a micrometer.
Valve Lifter Hole Diameter
●
Using an inside micrometer, measure valve lifter hole diameter
on cylinder head.
Calculation of Valve Lifter Clearance
(Clearance) = (Valve lifter hole inner diameter) - (Valve lifter outer diameter)
●
If outside the standard, refer to standard of each OD and hole ID and then replace valve lifter or cylinder
head as appropriate.
Valve Lifter (Shimless type)
●
Check if surface of valve lifter has any wear or cracks.
Valve Lifter Clearance
Outer Diameter of Valve Lifter
●
Measure outer diameter of valve lifter.
Standard
: 29.960 - 29.975 mm (1.1795 - 1.1801 in) dia.
MBIB0220E
Standard
: 30.000 - 30.021 mm (1.1811 - 1.1819 in) dia.
MBIB0221E
Standard
: 0.025 - 0.061 mm (0.0010 - 0.0024 in)
KBIA0182E
Valve lifter outer diameter (Intake and exhaust)
: 29.960 - 29.975 mm (1.1795 - 1.1801 in) dia.
JEM798G
CAMSHAFT
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Valve Lifter Hole Diameter
●
Using inside micrometer, measure diameter of valve lifter hole of
cylinder head.
Calculation of Valve Lifter Clearance
(Valve lifter clearance) = (hole diameter of valve lifter) – (outer diam-
eter of valve lifter).
●
When out of specified range, referring to each specification of outer and inner diameter, replace either or
both valve lifter and cylinder head.
Valve Clearance
EBS00QEI
INSPECTION
●
The following procedure is applicable when: Components related to camshafts or valves are removed,
installed, or replaced. Drivability concerns (poor starting, poor idling, noise) are caused by valve clearance
aging.
1.
Warm up engine, and stop.
2.
Remove RH splash cover (integrated with undercover).
3.
Remove rocker cover. Refer to
EM-32, "Removal and Installation"
.
4.
Turn crankshaft pulley clockwise (viewed from front) to align yel-
low paint with timing indicator.
5.
At this point, confirm that both intake and exhaust cam noses on
No. 1 cylinder face outward. (No. 1 cylinder is at TDC of its com-
pression stroke.)
●
If not, turn crankshaft pulley more.
NOTE:
Or, valves to be checked when No. 4 cylinder is at TDC of its
compression stroke can be checked first following step 8.
6.
Referring to figure, measure valve clearances of valves with
×
in
table below using a thickness gauge.
Standard (Intake and exhaust)
: 30.000 - 30.021 mm (1.1811 - 1.1819 in) dia.
Standard (Intake and exhaust)
: 0.025 - 0.061 mm (0.0010 - 0.0024 in)
SEM867E
MBIB0222E
Cylinder
No.1
No.2
No.3
No.4
Valve
INT
EXH
INT
EXH
INT
EXH
INT
EXH
No. 1 cylinder at
TDC of its compres-
sion stroke
×
×
×
×
MBIB0223E
MBIB0224E
EM-46
[QG]
CAMSHAFT
*: Approximately 20
°
C (68
°
F) (Reference data)
7.
Turn crankshaft pulley a full turn to position No. 4 cylinder at TDC of its compression stroke.
8.
Referring to figure, measure valve clearance of parts with
×
in
table below.
9.
If outside the standard, adjust applicable valves as shown
below.
ADJUSTMENT (SHIMLESS TYPE)
●
Perform adjustment depending on selected head thickness of valve lifter.
●
The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differ-
ences caused by temperature. Use the specifications for hot engine condition to adjust.
1.
Remove camshaft. Refer to
EM-35, "Removal and Installation"
.
2.
Remove the valve lifters at the locations that are outside the standard.
3.
Measure the center thickness of the removed valve lifters with a
micrometer.
4.
Use the equation below to calculate 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:
Valve clearance standard:
Hot
Intake
: 0.304 - 0.416 mm (0.012 - 0.016 in)
Exhaust
: 0.348 - 0.472 mm (0.014 - 0.019 in)
Cold*
Intake
: 0.25 - 0.33 mm (0.010 - 0.013 in)
Exhaust
: 0.32 - 0.40 mm (0.013 - 0.016 in)
If an adjustment is done with cold engine, confirm reference values with hot engine are met.
Limit values with hot engine (reference)
Intake
: 0.21 - 0.47 mm (0.008 - 0.019 in)
Exhaust
: 0.30 - 0.56 mm (0.012 - 0.022 in)
Cylinder
No.1
No.2
No.3
No.4
Valve
INT
EXH
INT
EXH
INT
EXH
INT
EXH
No. 4 cylinder at TDC of
its compression stroke
×
×
×
×
MBIB0225E
KBIA0057E
Intake
: 0.36 mm (0.014 in)
Exhaust
: 0.37 mm (0.015 in)
CAMSHAFT
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Thickness of a new valve lifter can be identified by stamp
marks on the reverse side (inside the cylinder).
Stamp mark 696 indicates 6.96 mm (0.2740 in) in thickness.
Available thickness of valve lifter: 26 sizes with range 6.96 to 7.46 mm (0.2740 to 0.2937 in) in steps of 0.02
mm (0.0008 in) (when manufactured at factory).
5.
Install the selected valve lifter.
6.
Install camshaft.
7.
Manually turn crankshaft pulley a few turns.
8.
Check that valve clearances for cold engine are within specifications by referring to the specified values.
9.
After completing the repair, check valve clearances again with the specifications for warmed engine. Make
sure the values are within specifications.
Valve clearance:
Unit: mm (in)
*: Approximately 20
°
C (68
°
F)
ADJUSTMENT (SHIM TYPE)
●
Remove adjusting shim for valves with incorrect valve clearance by following the procedure below:
1.
Using a rag, completely wipe off engine oil from surroundings of adjusting shim.
2.
When removing adjusting shim from a cam, turn crankshaft
clockwise (viewed from front) to make cam nose face straight
up.
3.
Turn valve lifter and adjusting shim to removal direction.
●
Using a slotted screwdriver with extra-thin tip, turn valve lifter
cutout in direction shown by the arrow.
4.
Using camshaft pliers (special service tool), pinch camshaft.
Turn tool up in direction shown by the arrow with camshaft being
a fulcrum. This will push down adjusting shim to allow valve
spring to be compressed.
CAUTION:
●
Be careful not to damage camshaft and cylinder head.
●
Be careful not to damage surroundings of valve lifter.
PBIC1077E
Cold* (reference data)
Hot
Intake
0.24 - 0.32 (0.009 - 0.013)
0.32 - 0.40 (0.013 - 0.016)
Exhaust
0.26 - 0.34 (0.010 - 0.013)
0.33 - 0.41 (0.013 - 0.016)
MBIB0226E
KBIA1391J
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