Toyota 1HZ Repair Manual

EM-64
ENGINE MECHANICAL - Cylinder Head
6. INSPECT CYLINDER HEAD FOR FLATNESS
Using a precision straight edge and thickness gauge,
measure the surfaces contacting the cylinder block mani-
folds for warpage.
Maximum warpage: 0.20 mm (0.0079 in.)
If warpage is greater than maximum, replace the cylinder
head.
7. INSPECT CYLINDER HEAD FOR CRACKS
Using a dye penetrant, check the combustion chamber,
intake and exhaust ports, head surface and the top of the
head for cracks.
If cracked, replace the cylinder head.
8. CLEAN VALVES
(a) Using a gasket scraper, chip any carbon from the valve
head.
(b) Using a wire brush, thoroughly clean the valve.
9. INSPECT VALVE STEMS AND GUIDE BUSHINGS
(a) Using a caliper gauge, measure the inside diameter of
the guide bushing.
Bushing inside diameter:
8.010-8.030 mm (0.3154-0.3161 in.)

Toyota 1HZ Specifications

General

Fuel Type	Diesel
Maximum Power	96 kW (129 hp) at 3800 rpm
Firing Order	1-5-3-6-2-4
Aspiration	Naturally aspirated
Fuel System	Direct injection
Cooling System	Water-cooled
Displacement	4.2 L (4164 cc)
Maximum Torque	285 N·m (210 lb·ft) at 2200 rpm
Valvetrain	SOHC, 12 valves (2 per cylinder)