Inspection and Replacement

INSPECTION
1. INSPECT CAMSHAFTS
2. INSPECT CAMSHAFT OIL CLEARANCE
3. INSPECT CAMSHAFT THRUST CLEARANCE
4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY
5. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY
6. INSPECT CAMSHAFT TIMING SPROCKET
7. INSPECT INNER COMPRESSION SPRING
8. CLEAN VALVE
9. INSPECT VALVE
10. INSPECT VALVE GUIDE BUSH OIL CLEARANCE
11. INSPECT VALVE LIFTER
12. INSPECT VALVE LIFTER OIL CLEARANCE
13. CLEAN CYLINDER HEAD SUB-ASSEMBLY
14. INSPECT CYLINDER HEAD SUB-ASSEMBLY
15. CLEAN VALVE SEAT
16. INSPECT VALVE SEAT

REPLACEMENT

1. REPLACE VALVE STEM OIL SEAL
(a) Using needle-nose pliers, remove the valve stem oil seal.

(b) Apply a light coat of engine oil to the valve stem oil seal.

HINT: The intake valve stem oil seal is light brown and the exhaust valve stem oil seal is gray.

2. REPLACE VALVE GUIDE BUSH
(a) Gradually heat the cylinder head to 80 to 90°C (176 to 212°F).
(b) Place the cylinder head on a wooden block.

(d) Using a caliper gauge, measure the bush bore diameter of the cylinder head.
Standard bush bore diameter: 10.295 to 10.315 mm (0.405 to 0.406 in.)
If the bush bore diameter of the cylinder head is greater than 10.315 mm (0.406 in.), machine the bush bore to the dimension of 10.345 to 10.365 mm (0.407 to 0.408 in.).

Standard valve guide bush diameter:

If the bush bore diameter of the cylinder head is more than 10.365 mm (0.4081 in.), replace the cylinder head.

(e) Gradually heat the cylinder head to 80 to 100°C (176 to 212°F).
(f) Place the cylinder head on a wooden block.

(g) Using SST, tap in a new valve guide bush to the specified protrusion height labeled A shown in the illustration.
SST 09201-10000, 09201-01055, 09950-70010 (09951-07100)
Standard protrusion height: 9.3 to 9.7 mm (0.366 to 0.382 in.)
(h) Using a sharp 5.5 mm reamer, ream the valve guide bush to obtain the standard specified clearance between the valve guide bush and valve stem.

Standard overall length:

3. REPLACE UNION
(a) Remove the union from the bank 1 cylinder head (front side) and bank 2 cylinder head (intake port side).
(b) Apply adhesive to 2 or 3 threads of the bolt end.
Adhesive: Toyota Genuine Seal Adhesive 1324, Three Bond 1324 or equivalent
(c) Using a 12 mm deep socket wrench, install the 2 unions.
Torque: 15 N*m (150 kgf*cm, 11 ft.*lbf)

4. REPLACE TIGHT PLUG

NOTICE: If water leaks from the tight plug or the plug corrodes, replace it.

(a) Remove the tight plugs.

(b) Apply adhesive around new tight plugs.
Adhesive: Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent
(c) Using SST and a hammer, tap in the tight plugs to the specified depth.
SST 09950-60010 (09951-00250), 09950-70010 (09951-07150)
Standard depth: 1.5 mm (0.0591 in.)

5. REMOVE HEAD STRAIGHT SCREW PLUG
(a) Using a 14 mm hexagon wrench, remove the straight screw plug and gasket.
(b) Using a 14 mm hexagon wrench, install a new gasket and straight screw plug.
Torque: 80 N*m (816 kgf*cm, 59 ft.*lbf)

6. REPLACE RING PIN

NOTICE: It is not necessary to remove the ring pin unless it is being replaced.

(a) Remove the ring pins.
(b) Using a plastic-faced hammer, tap in new ring pins until they reach the specified protrusion height labeled A shown in the illustration.
Standard protrusion height: 2.7 to 3.3 mm (0.106 to 0.0969 in.)

7. REPLACE STRAIGHT PIN

NOTICE: It is not necessary to remove the straight pin unless it is being replaced.

(a) Remove the straight pins.
(b) Using a plastic-faced hammer, tap in new straight pins until they reach the specified protrusion height labeled A shown in the illustration.

Standard protrusion height:

8. REPLACE STUD BOLT

NOTICE: If a stud bolt is deformed or the threads are damaged, replace it.

(a) Using E5 and E7 "TORX" socket wrench, remove the stud bolts.
(b) Using E5 and E7 "TORX" socket wrench, install the new stud bolts.
Torque:
for stud bolt A 4.0 N*m (41 kgf*cm, 35 in.*lbf)
for stud bolt B 20 N*m (204 kgf*cm, 15 ft.*lbf)
for stud bolt C 4.0 N*m (41 kgf*cm, 35 in.*lbf)