tow NISSAN PICK-UP 1999 Repair Manual

VALVE LIFTER AND VALVE SHIM
1. Visually check contact and sliding surfaces for wear and
scratches.
2. Check diameter of valve lifter and valve lifter guide bore.
Valve lifter outer diameter:
33.960 - 33.975 mm (1.3370 - 1.3376 in)
Lifter guide bore diameter:
34.000 - 34.021 mm (1.3386 - 1.3394 in)
Valve lifter to valve lifter guide clearance:
0.025 - 0.061 mm (0.0010 - 0.0024 in)
If it exceeds the standard diameter or clearance, replace
valve lifter or cylinder head.
Assembly
1. Install valve component parts.
lAlways use new valve oil seal. Refer to ªOIL SEAL
REPLACEMENTº (EM-2021).
lBefore installing valve oil seal, install valve spring seat.
lInstall outer valve spring (uneven pitch type) with its
narrow pitch side toward cylinder head side.
lAfter installing valve component parts, tap valve stem tip
with plastic hammer to assure a proper fit.
Valve Clearance
CHECKING
Check valve clearance while engine is warm but not run-
ning.
1. Remove rocker cover and all spark plugs.
2. Set No. 1 cylinder at TDC on its compression stroke.
lAlign pointer with TDC mark on crankshaft pulley.
lCheck that valve lifters on No. 1 cylinder are loose and valve
lifters on No. 4 are tight.
If not, turn crankshaft one revolution (360É) and align as
above.
AEM410
AEM411
SEM303D
SEM638B
AEM355
CYLINDER HEADKA24DE
Inspection (Cont'd)
EM-2032

3. Check only those valves shown in the figure.
4. Using a feeler gauge, measure clearance between valve lifter
and camshaft.
lRecord any valve clearance measurements which are out of
specification. They will be used later to determine the
required replacement adjusting shim.
Valve clearance (Hot):
Intake
0.31 - 0.39 mm (0.012 - 0.015 in)
Exhaust
0.33 - 0.41 mm (0.013 - 0.016 in)
5. Turn crankshaft one revolution (360É) and align mark on
crankshaft pulley with pointer.
6. Check those valves shown in the figure.
lUse the same procedure as mentioned in step 4.
7. If all valve clearances are within specification, install the fol-
lowing parts.
lRocker cover
lAll spark plugs
ADJUSTING
Adjust valve clearance while engine is cold.
1. Turn crankshaft to position cam lobe on camshaft of valve
that must be adjusted upward.
2. Place Tool (A) around camshaft as shown in figure.
3. Rotate Tool (A) so that lifter is pushed down.
Before placing Tool (A), rotate notch toward center of cylin-
der head (See figure.), to simplify shim removal later.
CAUTION:
Be careful not to damage cam surface with Tool (A).
4. Place Tool (B) between camshaft and the edge of the valve
lifter to retain valve lifter.
CAUTION:
lTool (B) must be placed as close to camshaft bracket as
possible.
lBe careful not to damage cam surface with Tool (B).
5. Remove Tool (A).
AEM382
SEM304D
AEM383
SEM515EB
SEM516EB
CYLINDER HEADKA24DE
Valve Clearance (Cont'd)
EM-2033

3. Measure crankshaft end play.
Crankshaft end play:
Standard
0.05 - 0.18 mm (0.0020 - 0.0071 in)
Limit
0.3 mm (0.012 in)
If beyond the limit, replace No. 3 bearing with a new one.
4. Install connecting rod bearings in connecting rods and con-
necting rod caps.
lConfirm that correct bearings are used.
Refer to EM-2044.
lInstall bearings so that oil hole in connecting rod aligns
with oil hole of bearing.
lApply new engine oil to bearing surfaces, bolt threads
and seating surfaces.
5. Install pistons with connecting rods.
a. Install them into corresponding cylinders with Tool.
lArrange so that front mark on piston head faces toward
front of engine.
lMake sure connecting rod does not scratch cylinder
wall.
lMake sure connecting rod bolts do not scratch crank-
shaft journals.
lApply new engine oil to piston rings and sliding surface
of piston.
b. Install connecting rod bearing caps.
Tighten connecting rod bearing cap nuts using the following
procedure.
Connecting rod bearing nut:
(1) Tighten to 14 to 16 Nzm
(1.4 to 1.6 kg-m, 10 to 12 ft-lb).
(2) Tighten bolts 60
+5
þ0degrees clockwise
with an angle wrench.
If an angle wrench is not available, tighten
them to 38 to 44 Nzm (3.9 to 4.5 kg-m, 28 to 33
ft-lb).
6. Measure connecting rod side clearance.
Connecting rod side clearance:
Standard
0.2 - 0.4 mm (0.008 - 0.016 in)
Limit
0.6 mm (0.024 in)
If beyond the limit, replace connecting rod and/or crankshaft.
EEM122
SEM159B
SEM269CB
EEM123
EEM124
CYLINDER BLOCKKA24DE
Assembly (Cont'd)
EM-2047

Disassembly
CENTER BEARING
1. Place matching marks on flanges, then separate 2nd tube
from 1st tube.
2. Place matching marks on the flange and shaft.
3. Secure the flange yoke with a vice and remove the lock nut.
4. Remove flange yoke using puller.
5. Remove center bearing using Tool and press.
Tool number: ST30031000
Assembly
CENTER BEARING
lWhen installing center bearing, position the ªFº mark on cen-
ter bearing toward front of vehicle.
lApply a coat of multi-purpose lithium grease containing
molybdenum disulfide to the end face of the center bear-
ing and both sides of the washer.
lStake the nut. Always use new one.
lAlign match marks when assembling tubes.
SPD513A
SPD514A
SPD113
SPD114
PROPELLER SHAFTPropeller shaft
PD-2006

Precautions for SRS ``AIR BAG'' and ``SEAT
BELT PRE-TENSIONER'' Service
lDo not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
lBefore servicing the SRS, turn ignition switch ``OFF'', disconnect both battery cables and wait at least
3 minutes.
For approximately 3 minutes after the cables are removed, it is still possible for the air bag to deploy.
Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
lDiagnosis sensor unit must always be installed with their arrow marks ``S'' pointing towards the front of
the vehicle for proper operation. Also check diagnosis sensor unit for cracks, deformities or rust before
installation and replace as required.
lThe spiral cable must be aligned with the neutral position since its rotations are limited. Do not attempt
to turn steering wheel or column after removal of steering gear.
lHandle air bag module carefully. Always place driver and passenger air bag modules with the pad side
facing upward.
lConduct self-diagnosis to check entire SRS for proper function after replacing any components.
lAfter air bag inflates, the front instrument panel assembly should be replaced if damaged.
Special Service Tools
Tool number
Tool nameDescription
KV99106400
Deployment tool
NT357
Disposing of air bag module
KV99105300
Air bag module bracket
NT354
Anchoring air bag module
HT61961000 and
HT62152000 combined
*Special torx bit
NT361
Use for special bolts
[TAMPER RESISTANT TORX (Size T50)]
a: 3.5 (0.138) dia.
b: 8.5 - 8.6 (0.335 - 0.339) dia.
c: approx. 10 (0.39) sq.
Unit: mm (in)
KV99108300
Deployment tool adapters for
passenger air bag
NT776
*: Special tool or commercial equivalent
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-2004