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EM-38
ENGINE MECHANICAL (5VZ-FE) - CYLINDER HEAD
EM0Z2-03
INSPECTION
1. CLEAN TOP SURFACES OF PISTONS AND CYL-
INDER BLOCK
(a) Turn the crankshaft and bring each piston to top dead
center (TDC). Using a gasket scraper, remove all the car-
bon from the piston top surfaces.
P20505
(b) Using a gasket scraper, remove all the gasket material
from the cylinder block surfaces.
(c) Using compressed air, blow carbon and oil from the bolt
holes.
CAUTION:
Protect your eyes when using high-compressed air.
2. INSPECT TOP SURFACE OF CYLINDER BLOCK FOR
FLATNESS (See page EM-88 )
P20504
3. CLEAN CYLINDER HEAD
(a) Using a gasket scraper, remove all the gasket material
from the cylinder block contact surface.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
faces.
P20503
(b) Using a wire brush, remove all the carbon from the com-
bustion chambers.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
faces.
P20512
(c) Using a valve guide bushing brush and solvent, clean all
the guide bushings.
P20986
2002 4RUNNER (RM887U)
Author : Date : 850
EM-39
ENGINE MECHANICAL (5VZ-FE) - CYLINDER HEAD
(d) Using a soft brush and solvent, thoroughly clean the cylin-
der heads.
P20506
4. INSPECT CYLINDER HEAD
(a) Inspect for flatness.
Using a precision straight edge and feeler gauge, mea-
sure the surfaces contacting the cylinder block and man-
ifolds for warpage.
Maximum warpage: 0.10 mm (0.0039 in.)
If warpage is greater than maximum, replace the cylinder head.
Z14652
(b) Inspect for cracks.
Using a dye penetrant, check the combustion chamber,
intake ports, exhaust ports and cylinder block surface for
cracks.
If cracked, replace the cylinder head.
P20514
5. CLEAN VALVES
(a) Using a gasket scraper, chip off any carbon from the valve
head.
(b) Using a wire brush, thoroughly clean the valve.
EM0580
2002 4RUNNER (RM887U)
Author : Date : 851
EM-40
ENGINE MECHANICAL (5VZ-FE) - CYLINDER HEAD
6. INSPECT VALVE STEMS AND GUIDE BUSHINGS
(a) Using a caliper gauge, measure the inside diameter of the
guide busing.
Bushing inside diameter:
6.010 - 6.030 mm (0.2366 - 0.2374 in.)
P21251
(b) Using a micrometer, measure the diameter of the valve
stem.
Valve stem diameter:
Intake 5.970 - 5.985 mm (0.2350 - 0.2356 in.)
Exhaust 5.965 - 5.980 mm (0.2348 - 0.2354 in.)
(c) Subtract the valve stem diameter measurement from the
guide bushing inside diameter measurement.
Standard oil clearance:
Z00052
Intake 0.025 - 0.060 mm (0.0010 - 0.0024 in.)
Exhaust 0.030 - 0.065 mm (0.0012 - 0.0026 in.)
maximum oil clearance:
Intake 0.08 mm (0.0031 in.)
Exhaust 0.10 mm (0.0039 in.)
If the clearance is greater than maximum, replace the valve and
guide bushing. (See page EM-47 )
7. INSPECT AND GRIND VALVES
(a) Grind the valve enough to remove pits and carbon.
(b) Check that the valve is ground to the correct valve face
angle.
Valve face angle: 44.5◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo