2001 INFINITI QX4 Factory Service Manual

Page 1681 of 2395

INFINITI QX4 2001  Factory Service Manual ComponentsNBEM0016
SEM441GA
1. Oil filler cap
2. Rocker cover
3. Camshaft bracket
4. Camshaft
5. PCV valve
6. Cylinder head
7. Blow-by hose8. Spark plug
9. Valve
10. Valve spring seat
11. Valve spring

Page 1682 of 2395

INFINITI QX4 2001  Factory Service Manual CAUTION:
IWhen installing camshafts, chain tensioners, oil seals, or
other sliding parts, lubricate contacting surfaces with new
engine oil.
IApply new engine oil to threads and seat surfaces when
ins

Page 1683 of 2395

INFINITI QX4 2001  Factory Service Manual SEM447G
10. Remove O-rings to cylinder head.
SEM534G
11. Remove O-rings to cylinder block.
SEM443G
12. Remove CVTC valves.
SEM856E
SEM857E
13. Remove intake and exhaust camshafts and camshaft brackets

Page 1684 of 2395

INFINITI QX4 2001  Factory Service Manual SEM444G
14. Remove RH and LH camshaft chain tensioners from cylinder
head.
SEM859E
SEM860E
15. Remove cylinder head bolts.
ICylinder head bolts should be loosened in two or three
steps.
IA warped or c

Page 1685 of 2395

INFINITI QX4 2001  Factory Service Manual SEM861E
InspectionNBEM0019CYLINDER HEAD DISTORTIONNBEM0019S01Clean surface of cylinder head.
Use a reliable straightedge and feeler gauge to check the flatness
of cylinder head surface.
Check along si

Page 1686 of 2395

INFINITI QX4 2001  Factory Service Manual SEM012A
3. Measure outer diameter of camshaft journal.
Standard outer diameter:
No. 1: 25.935 - 25.955 mm (1.0211 - 1.0218 in)
No. 2, 3, 4: 23.445 - 23.465 mm (0.9230 - 0.9238 in)
4. If clearance exce

Page 1687 of 2395

INFINITI QX4 2001  Factory Service Manual SEM938C
2. If it exceeds the limit, check valve to valve guide clearance.
a. Measure valve stem diameter and valve guide inner diameter.
b. Check that clearance is within specification.
Valve to valve

Page 1688 of 2395

INFINITI QX4 2001  Factory Service Manual SEM934C
VALVE SEATSNBEM0019S10Check valve seats for any evidence of pitting at valve contact
surface, and reseat or replace if it has worn out excessively.
IBefore repairing valve seats, check valve a