Lexus NX: Replacement
REPLACEMENT
PROCEDURE
1. REPLACE INTAKE VALVE GUIDE BUSH
(a) Heat the cylinder head sub-assembly to approximately 80 to 100°C (176 to 212°F).
(b) Place the cylinder head sub-assembly on wooden blocks.
| (c) Using SST and a hammer, tap out the intake valve guide bush. SST: 09201-01055 SST: 09950-70010 09951-07100 |
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(d) Using a caliper gauge, measure the bush bore diameter of the cylinder head sub-assembly.
Standard bush bore diameter:
10.285 to 10.306 mm (0.405 to 0.406 in.)
If the bush bore diameter of the cylinder head sub-assembly is between 10.285 and 10.306 mm (0.405 and 0.406 in.), proceed to the next step.
If the bush bore diameter of the cylinder head sub-assembly is 10.356 mm (0.408 in.) or more, replace the cylinder head sub-assembly.
(e) Select a new intake valve guide bush (STD or O/S 0.05) and measure its diameter.
(f) Machine the bush bore of the cylinder head sub-assembly to the diameter of the selected intake valve guide bush.
Standard Bush Diameter:
| Bush Size | Specified Condition |
|---|---|
| STD | 10.333 to 10.344 mm (0.4068 to 0.4072 in.) |
| O/S 0.05 | 10.383 to 10.394 mm (0.4088 to 0.4092 in.) |
Standard bush length:
41.3 to 41.7 mm (1.626 to 1.642 in.)
(g) Heat the cylinder head sub-assembly to approximately 80 to 100°C (176 to 212°F).
| (h) Using SST and a hammer, tap in the selected intake valve guide bush to the standard protrusion height. SST: 09201-10000 09201-01050 SST: 09950-70010 09951-07100 Standard protrusion height: 14.8 to 15.2 mm (0.583 to 0.598 in.) |
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| (i) Using a sharp 5.5 mm reamer, ream the intake valve guide bush to obtain the standard oil clearance between the intake valve guide bush and valve stem. Standard oil clearance: 0.025 to 0.060 mm (0.000984 to 0.00236 in.) |
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2. REPLACE EXHAUST VALVE GUIDE BUSH
(a) Heat the cylinder head sub-assembly to approximately 80 to 100°C (176 to 212°F).
(b) Place the cylinder head sub-assembly on wooden blocks.
| (c) Using SST and a hammer, tap out the exhaust valve guide bush. SST: 09201-01055 SST: 09950-70010 09951-07100 |
|
(d) Using a caliper gauge, measure the bush bore diameter of the cylinder head sub-assembly.
Standard bush bore diameter:
10.285 to 10.306 mm (0.405 to 0.406 in.)
If the bush bore diameter of the cylinder head sub-assembly is between 10.285 and 10.306 mm (0.405 and 0.406 in.), proceed to the next step.
If the bush bore diameter of the cylinder head sub-assembly is 10.356 mm (0.408 in.) or more, replace the cylinder head sub-assembly.
(e) Select a new exhaust valve guide bush (STD or O/S 0.05) and measure its diameter.
(f) Machine the bush bore of the cylinder head sub-assembly to the diameter of the selected exhaust valve guide bush.
Standard Bush Diameter:
| Bush Size | Specified Condition |
|---|---|
| STD | 10.333 to 10.344 mm (0.4068 in 0.4072 in.) |
| O/S 0.05 | 10.383 to 10.394 mm (0.4088 to 0.4092 in.) |
Standard bush length:
46.8 to 47.2 mm (1.843 to 1.858 in.)
(g) Heat the cylinder head sub-assembly to approximately 80 to 100°C (176 to 212°F).
| (h) Using SST and a hammer, tap in the selected exhaust valve guide bush to the standard protrusion height. SST: 09201-10000 09201-01050 SST: 09950-70010 09951-07100 Standard protrusion height: 14.2 to 14.6 mm (0.559 to 0.575 in.) |
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| (i) Using a sharp 5.5 mm reamer, ream the exhaust valve guide bush to obtain the standard oil clearance between the exhaust valve guide bush and valve stem. Standard oil clearance: 0.030 to 0.065 mm (0.00118 to 0.00256 in.) |
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3. REPLACE SPARK PLUG TUBE
HINT:
When using a new cylinder head sub-assembly, the spark plug tubes must be replaced.
| (a) Apply adhesive onto the shaded area of a new spark plug tube. Adhesive: Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent. Standard application width: 1.0 to 3.0 mm (0.0394 to 0.1181 in.) Distance: 1.0 to 7.0 mm (0.0394 to 0.2756 in.) NOTICE:
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| (b) Using a wooden block and hammer, tap in the spark plug tube to the specified protrusion height. Standard protrusion height: 112 mm (4.41 in.) NOTICE: To avoid tapping in the spark plug tube too far, measure the protrusion height while tapping it. |
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4. 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 to the cylinder head sub-assembly. Standard protrusion height: 6.5 to 7.5 mm (0.256 to 0.295 in.) |
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READ NEXT:
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