2003 NISSAN ALMERA N16 ECU

EM-34
[QG]
CAMSHAFT
c. Slowly turn intake camshaft in direction A (counterclockwise:
intake manifold side).
●Perform while applying air pressure.
CAUTION:
Be careful not to dislocate camshaft retaining spanner.
d. During above step, operating click (a sound indicating internal
lock pin is disengaged) is heard from inside of intake camshaft
sprocket. After hearing it, slowly turn intake camshaft in direction
B (clockwise: exhaust manifold side), and set to most advanced
position.
●Perform while applying air pressure.
●When vane rotates solely against sprocket, lock pin is disengaged even if operating click is not heard.
●If lock pin is not disengaged, apply vibration by jiggling the camshaft with a spanner.
●If lock pin is not disengaged with above step, hit intake camshaft in front by using plastic hammer.
e. The following status indicates that most advanced position is
achieved: vane starts rotating on its own, then sprocket also
starts rotating when camshaft is turned. When above status is
achieved, this step is complete.
●Most advanced position is confirmed when stopper pin groove
and lock pin breathing groove are aligned.
f. Stop air, insert stopper pin [approximately 3 mm (0.12 in) dia.,
length of inserted part is approximately 15 mm (0.59 in)] into
pinhole on camshaft sprocket to fix most advanced position.
NOTE:
In the figure, an Allen wrench [a/f 2.5 mm (0.091 in), short part:
approximately 20 mm (0.79 in), long part: approximately 50 mm
(1.97 in)] is used for stopper pin as an example.
CAUTION:
Load (spring reaction force) is not applied to stopper pin.
Pin is easily detached. Therefore, secure it with vinyl tape to
prevent detachment.
5. Remove chain tensioner.
●Remove in the following order.
a. Press plate down, and release stopper tab.
b. Insert plunger into tensioner body until it stops.
c. Secure plate by passing stopper pin (such as a hard wire)
through plate hole and body hole. (Plunger is also secured.)
d. Remove mounting bolts, and remove chain tensioner.
KBIA1414J
MBIB0198E
PBIC0966E
MBIB0201E

CAMSHAFT
EM-35
[QG]
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6. While holding hexagonal part of camshaft with a spanner, loosen
mounting bolts and remove intake and exhaust camshaft
sprockets.
CAUTION:
●Be careful that tool does not interfere with A/C piping.
●Avoid securing camshaft at other than hexagonal part
and loosening mounting bolts by utilizing tension of tim-
ing chain.
●Handle intake camshaft sprocket, taking care of following.
CAUTION:
●Secure stopper pin with vinyl tape to prevent detach-
ment.
●Avoid dropping it or subjecting it to impact.
●Do not disassemble. (Do not loosen 3 bolts on front sur-
face.)
NOTE:
If stopper pin is detached and lock pin is engaged at most retarded position during removal, recover as
follows.
a. Reinstall stopper pin to intake camshaft, and tighten intake camshaft sprocket mounting bolts so that air
does not leak.
CAUTION:
Tightening torque for mounting bolts must be minimum so that air does not leak, preventing dam-
age on internal lock pin.
b. Apply air pressure to disengage lock pin, and turn vane to most advanced position. (This step can be per-
formed with timing chain removed.)
c. Reinstall stopper pin.
d. Remove intakecamshaft sprocket from camshaft.
7. Remove camshaft brackets.
●Loosen mounting bolts in several steps in reverse order
shown in figure.
8. Remove camshaft.
CAUTION:
Be careful not to damage signal plate on rear end of intake
camshaft and crankshaft.
9. Remove adjusting shims and valve lifters.
●Identify installation position of each valve. Arrange removed
valves so they cannot be mixed up.
INSTALLATION
1. Install valve lifters and adjusting shims.
●Install them in their original positions.
●Install adjusting shim with its stamped mark facing downward (valve lifter side).
EMD0826D
MBIB0202E
PBIC0969E

CAMSHAFT
EM-37
[QG]
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CAUTION:
Stopper pin is easily detached. Secure it with vinyl tape to prevent detachment.
a. Install timing chain by aligning its mating mark (marked when
timing chain is removed) with mark on camshaft sprocket.
●Align dowel pin on camshaft front surface and pinhole on
sprocket backside, then install.
b. While holding hexagonal part of camshaft with a spanner,
tighten intake camshaft sprocket mounting bolts.
●Make sure that stopper pin is not detached.
6. Install exhaust camshaft sprocket as follows.
a. Install timing chain by aligning its mating mark (marked when
timing chain is removed) with mark on camshaft sprocket.
●Align dowel pin on camshaft front surface and pinhole on
sprocket, then install.
b. While holding hexagonal part of camshaft with a spanner,
tighten exhaust camshaft sprocket mounting bolts.
NOTE:
Tightening torque is different from intake side tightening torque.
c. Make sure that mating marks on intake/exhaust camshaft
sprockets and mating mark on timing chain are aligned.
7. Install chain tensioner.
●Hold plate and plunger with a stopper pin, then install them.
●After installation, remove stopper pin and release plunger.
●Make sure again that mating marks on intake/exhaust cam-
shaft sprockets and mating mark on timing chain are aligned.
MBIB0208E
MBIB0209E
MBIB0210E
MBIB0211E

CAMSHAFT
EM-45
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5. With valve spring compressed, securely place tip of lifter stopper
(special service tool) onto surroundings of valve spring. Then
remove camshaft pliers (special service tool).
CAUTION:
If camshaft pliers are suddenly turned back, lifter stopper
may contact and damage camshaft journals. Turn back
camshaft pliers carefully to remove.
6. Keep adjusting shim slightly up from valve lifter.
●Insert a slotted screwdriver with extra-thin tip into cutout on
valve lifter for this purpose.
7. Using a magnetic handle, remove adjusting shim.
8. Using a micrometer, measure thickness (t1) of removed adjust-
ing shim at camshaft contact face (around center).
9. Use following formula to select proper replacement adjusting shim.
●Formula to calculate adjusting shim thickness (unit: mm)
Thickness of replacement valve lifter = t1+ ( C1 - C2 )
t1 = Thickness of removed valve lifter
C1 = Measured valve clearance
C2=Standard valve clearance:
PBIC1013E
PBIC1014E
MBIB0229E
Hot engine:
Intake : 0.37 mm (0.015 in)
Exhaust : 0.40 mm (0.016 in)
Reference values with cold engine:
Intake : 0.30 mm (0.012 in)
Exhaust : 0.35 mm (0.014 in)

TIMING CHAIN
EM-49
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b. Make sure that the camshaft sprocket mating mark is in the
position shown in the figure.
●If the mating mark is not in position, turn the crankshaft pulley
once more and position it.
22. Remove crankshaft pulley with the following procedure:
a. Secure crankshaft counter weight with handle of a hammer, and
loosen crankshaft pulley bolts.
CAUTION:
Take care to prevent foreign material from entering the
engine.
b. Remove crankshaft pulley using crankshaft pulley puller (com-
mercial service tool).
CAUTION:
●Hook tab onto back of crankshaft pulley only.
●Do not remove crankshaft pulley bolt. Fully loosen, and
then use it as support point.
NOTE:
If oil pan is not removed, remove crankshaft pulley as follows.
i. Remove rear plate (lower).
ii. Engage drive plate ring gear with a flat-head screwdriver to fix
crankshaft in position, and loosen crankshaft pulley bolt.
iii. Remove crankshaft pulley using crankshaft pulley puller (com-
mercial service tool).
23. Remove water pump pulley and idler pulley bracket assembly.
MBIB0194E
PBIC0565E
KBIA1437E
KBIA1438E

EM-50
[QG]
TIMING CHAIN
24. Remove front cover with the following procedure:
a. To increase freedom of front cover posture during removal/
installation, pull oil pump drive spacer out through front oil seal.
●Pull it straight out using long-nose priers or two flat-bladed
screwdrivers.
CAUTION:
Be careful not to damage side of oil pump drive spacer and
front oil seal lip.
b. Remove power steering pump adjusting bar.
c. Remove front cover carefully.
●Remove mounting bolts A - E shown in figure.
NOTE:
Bolts C and E have been removed in step b.
CAUTION:
●When removing, be careful not to damage or bend front
end of cylinder head gasket. Also after peeling off con-
tact face between front cover and gasket, their surfaces
shall be smooth.
●If cylinder head gasket is damaged, replace it with new
one.
d. Remove O-rings from front cover and cylinder block.
25. Pull two dowel pins for front cover out of cylinder block.
●Heat them with industrial dryer sufficiently, then pull them out
using locking pliers.
NOTE:
This operation is performed as preparation operation for front
cover installation. This operation can be performed after
removal of timing chain.
26. If front oil seal is need to be replaced, remove it from front cover.
●Insert a flat-bladed screwdriver in notch on oil seal mounting
point, and lift oil seal to remove.
NOTE:
Remove timing chain and its related parts with the following pro-
cedure:
27. Secure intake camshaft sprocket in most advanced position. Refer to EM-32, "
REMOVAL" .
NOTE:
Removal of timing chain and related parts is described in following steps.
28. Remove chain tensioner. Refer to EM-32, "
REMOVAL" .
29. Remove camshaft sprocket. Refer to EM-32, "
REMOVAL" .
CAUTION:
After this step is completed, do not rotate crankshaft and camshaft separately in order to prevent
interference between valve and piston.
PBIC0566E
EMD0850D
PBIC0567E
PBIC0558E

EM-52
[QG]
TIMING CHAIN
2. Install front oil seal to front cover.
●Install it so that identification letters on oil seal will face toward
front side of the engine.
●Using an oil seal drift (commercial service tool), press oil seal
in until it is flush with end surface of mounting position.
●Make sure that oil seal outer circumference is free from dam-
age and burr.
3. Install front cover with the following procedure:
a. Install O-ring to cylinder block.
b. Using a flat-bladed screwdriver, apply a continuous bead of liq-
uid gasket to contact surface between cylinder head gasket
lower surface and cylinder block (2 locations shown in figure).
Use Genuine Liquid Gasket or equivalent.
c. Apply a continuous bead of liquid gasket to back surface of front
cover (location shown in figure).
CAUTION:
●Do not apply liquid gasket to groove A shown in figure.
●Especially for locations indicated by * mark in figure,
strictly observe application range of liquid gasket.
d. Apply liquid gasket to top surface of front cover lightly and
evenly.
Use Genuine Liquid Gasket or equivalent.
e. Install O-ring to back surface of front cover.
f. With socket of oil pump inner rotor placed on crankshaft top sur-
face (clearance between front cover top surface and cylinder
head gasket lower surface is secured), move front cover close to
cylinder block. (Right side in figure)
g. Lift front cover at an angle and install it to mounting position so
that front cover will come in contact with both cylinder head gas-
ket lower surface and cylinder block front surface at the same
time. (Right side in figure)
CAUTION:
●During work, be sure not to damage cylinder head gas-
ket.
●When installing, avoid discontinuous bead of liquid gas-
ket caused by allowing it to adhere to an unnecessary area.
PBIC0530E
PBIC0561E
PBIC0562E
PBIC0563E

TIMING CHAIN
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h. Install front cover with mounting bolts temporarily so that front
cover will not move.
i. Press fit dowel pin into cylinder block through front cover.
j. Tighten front cover mounting bolts temporarily.
●A [M6 x 20 mm (0.79 in)], B [M6 x 40 mm (1.57 in)], C [M8 x
70 mm (2.76 in)], D [M6 x 73 mm (2.87 in)]
●Bolt C also secures power steering pump adjusting bar.
●Bolt E [M6 x 12 mm (0.47 in)] is for installing power steering
pump adjusting bar.
k. Tighten cylinder head auxiliary bolts (M6) temporarily.
l. Tighten front cover mounting bolts and cylinder head auxiliary
bolts to specified torque.
4. Install oil pump drive spacer.
●When installing, align with flat of oil pump inner rotor.
●If they are not aligned, rotate inner rotor with a flat-bladed
screwdriver to align them.
CAUTION:
Be careful not to damage oil seal lips.
5. Install water pump pulley and idler pulley bracket assembly.
6. Install crankshaft pulley.
●When installing it, make sure that front oil seal lip is not inverted and garter spring is in position.
●For direction of mounting bolt washer, refer to “Component Parts Location”.
●With same procedure as “removal”, secure crankshaft, and tighten mounting bolts.
7. Install cylinder head front cover.
●Apply liquid gasket to cylinder head front cover.
●Use Genuine Liquid Gasket or equivalent.
8. Install engine front mounting bracket.
9. Install remaining parts in the reverse order of removal.
INSPECTION AFTER INSTALLATION
●In order to allow liquid gasket to be cured, perform inspection at least 30 minutes after the last step in
which parts sealed with liquid gasket are installed.
●With engine warmed up, check each part for engine oil leakage.
PBIC0564E
EMD0850D
PBIC0566E
PBIC0968E