Inspection [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY

Turn the roller by hand to check that it turns smoothly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the roller does not turn smoothly, replace the No. 1 valve rocker arm sub-assembly.

INSPECT VALVE LASH ADJUSTER ASSEMBLY

NOTE:

Keep the valve lash adjuster assembly free from dirt and foreign matter.
Only use clean engine oil.

Pre-procedure1

Place the valve lash adjuster assembly into a container filled with engine oil.

Insert the tip of SST into the valve lash adjuster assembly plunger and use the tip to press down on the check ball inside the plunger.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Correct	*b	Incorrect
*c	Tapered Path	*d	Low Pressure Chamber
*e	High Pressure Chamber	*f	Plunger
*g	Check Ball	-	-

SST: 09276-75010

Squeeze SST and the valve lash adjuster assembly together to move the plunger up and down 5 to 6 times.

Check the movement of the plunger and bleed the air.
OK

The plunger moves up and down.

NOTE:
When bleeding air from the high pressure chamber, make sure that the tip of SST is pressing the check ball as shown in the illustration. If the check ball is not pressed, air will not bleed.

After bleeding the air, remove SST. Then try to quickly and firmly press the plunger by hand.
OK

The plunger is very difficult to move.
If the plunger moves, bleed the air again.
If the plunger is easy to move, replace the valve lash adjuster assembly.

Post-procedure1

None

INSPECT CAMSHAFT

Inspect the camshaft for runout.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Place the camshaft on V-blocks.

Using a dial indicator, measure the runout at the center journal.

Maximum Runout

Specified Condition	Result
0.03 mm 0.00118 in.	mm in.

If the runout is more than the maximum, replace the camshaft.

Inspect the cam lobes.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a micrometer, measure the cam lobe height.

Standard Cam Lobe Height

Minimum Cam Lobe Height	Specified Condition	Result
42.157 mm 1.65972 in.	42.217 to 42.417 mm 1.66208 to 1.66996 in.	mm in.

If the cam lobe height is less than the minimum, replace the camshaft.

Inspect the camshaft journals.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a micrometer, measure the journal diameter.

Standard Journal Diameter

Item	Specified Condition	Result
No. 1 journal	33.984 to 34.000 mm 1.33795 to 1.33858 in.	mm in.
Other journals	23.959 to 23.975 mm 0.94327 to 0.94390 in.	mm in.

If the journal diameter is not as specified, check the camshaft oil clearance.

INSPECT NO. 2 CAMSHAFT

Inspect the No. 2 camshaft for runout.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Place the No. 2 camshaft on V-blocks.

Using a dial indicator, measure the runout at the center journal.

Maximum Runout

Specified Condition	Result
0.03 mm 0.00118 in.	mm in.

If the runout is more than the maximum, replace the No. 2 camshaft.

Inspect the cam lobes.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a micrometer, measure the cam lobe height.

Standard Cam Lobe Height

Item	Minimum Cam Lobe Height	Specified Condition	Result
No. 2 camshaft	37.804 mm 1.48834 in.	37.914 to 38.114 mm 1.49267 to 1.50055 in.	mm in.
No. 2 camshaft (for Fuel Pump)	39.348 mm 1.54913 in.	39.398 to 39.598 mm 1.55110 to 1.55897 in.	mm in.

If the cam lobe height is less than the minimum, replace the No. 2 camshaft.

Inspect the No. 2 camshaft journals.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a micrometer, measure the journal diameter.

Standard Journal Diameter

Item	Specified Condition	Result
No. 1 journal	40.984 to 41.000 mm 1.61354 to 1.61417 in.	mm in.
Other journals	23.959 to 23.975 mm 0.94327 to 0.94390 in.	mm in.

If the journal diameter is not as specified, check the camshaft oil clearance.

INSPECT CAMSHAFT OIL CLEARANCE

Pre-procedure1

Clean the No. 1 camshaft bearing cap, No. 2 camshaft bearing cap, 2 No. 3 camshaft bearing caps, No. 4 camshaft bearing cap, camshaft housing sub-assembly and camshaft journals.
Place the camshaft and No. 2 camshaft on the camshaft housing sub-assembly.

Lay a strip of Plastigage across each of the camshaft journals.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Plastigage

Install the camshaft bearing caps.
NOTE:
Do not turn the camshafts.

HINT:

See step 25
Remove the camshaft bearing caps.
NOTE:
Do not turn the camshafts.

HINT:

See step 49

Measure the Plastigage at its widest point.

Standard Oil Clearance (for Camshaft)

Item	Maximum Oil Clearance	Specified Condition	Result
No. 1 Journal	0.085 mm 0.00335 in.	0.035 to 0.072 mm 0.00138 to 0.00283 in.	mm in.
Other Journals	0.085 mm 0.00335 in.	0.025 to 0.062 mm 0.000984 to 0.00244 in.	mm in.

Maximum Oil Clearance (for No. 2 camshaft)

Item	Maximum Oil Clearance	Specified Condition	Result
No. 1 Journal	0.085 mm 0.00335 in.	0.027 to 0.064 mm 0.00106 to 0.00252 in.	mm in.
Other Journals	0.085 mm 0.00335 in.	0.025 to 0.062 mm 0.000984 to 0.00244 in.	mm in.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Plastigage
*b	No. 1 Journal
*c	Other Journal

NOTE:

Completely remove the Plastigage after the inspection.

If the oil clearance is more than the maximum, replace the camshaft or No. 2 camshaft. If necessary, replace the camshaft housing sub-assembly.

Post-procedure1

None

INSPECT CHAIN SUB-ASSEMBLY

Pre-procedure1

Using a spring scale, pull the chain sub-assembly with a force of 147 N (15 kgf, 33.0 lbf) as shown in the illustration.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Measurement Length

Using a vernier caliper, measure the length of 15 links.

Maximum Chain Elongation

Specified Condition	Result
116.35 mm 4.58 in.	mm in.

HINT:

Perform the measurement at 3 random places. Use the average of the measurements.

If the average elongation is more than the maximum, replace the chain sub-assembly.

Post-procedure1

None

INSPECT OIL PUMP DRIVE CHAIN SUB-ASSEMBLY

Pre-procedure1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Measurement Length

Using a spring scale, pull the oil pump drive chain sub-assembly with a force of 147 N (15 kgf, 33.0 lbf) as shown in the illustration.

Using a vernier caliper, measure the length of 15 links.

Maximum Chain Elongation

Specified Condition	Result
116.35 mm 4.58 in.	mm in.

HINT:

Perform the measurement at 3 random places. Use the average of the measurements.

If the average elongation is more than the maximum, replace the oil pump drive chain sub-assembly.

Post-procedure1

None

INSPECT OIL PUMP DRIVE SPROCKET

Pre-procedure1

Place the oil pump drive chain sub-assembly around the oil pump drive sprocket.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a vernier caliper, measure the diameter of the oil pump drive sprocket and oil pump drive chain sub-assembly.

Minimum Sprocket Diameter (with Oil Pump Drive Chain Sub-assembly)

Specified Condition	Result
51.23 mm 2.02 in.	mm in.

NOTE:

The vernier caliper must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the oil pump drive chain sub-assembly and oil pump drive sprocket.

Post-procedure1

None

INSPECT OIL PUMP DRIVE SHAFT SPROCKET

Pre-procedure1

Place the oil pump drive chain sub-assembly around the oil pump drive shaft sprocket.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a vernier caliper, measure the diameter of the oil pump drive shaft sprocket and oil pump drive chain sub-assembly.

Minimum Sprocket Diameter (with Oil Pump Drive Chain Sub-assembly)

Specified Condition	Result
51.23 mm 2.02 in.	mm in.

NOTE:

The vernier caliper must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the oil pump drive chain sub-assembly and oil pump drive shaft sprocket.

Post-procedure1

None

INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

Pre-procedure1

Place the chain sub-assembly around the camshaft timing gear assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a vernier caliper, measure the diameter of the camshaft timing gear assembly and chain sub-assembly.

Minimum Gear Diameter (with Chain Sub-assembly)

Specified Condition	Result
100.01 mm 3.94 in.	mm in.

NOTE:

The vernier caliper must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the chain sub-assembly and camshaft timing gear assembly.

Post-procedure1

None

INSPECT CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY

Pre-procedure1

Place the chain sub-assembly around the camshaft timing exhaust gear assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a vernier caliper, measure the diameter of the camshaft timing exhaust gear assembly and chain sub-assembly.

Minimum Gear Diameter (with Chain Sub-assembly)

Specified Condition	Result
100.01 mm 3.94 in.	mm in.

NOTE:

The vernier caliper must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the chain sub-assembly and camshaft timing exhaust gear assembly.

Post-procedure1

None

INSPECT CRANKSHAFT TIMING SPROCKET

Pre-procedure1

Place the chain sub-assembly around the crankshaft timing sprocket.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a vernier caliper, measure the diameter of the crankshaft timing sprocket and chain sub-assembly.

Minimum Sprocket Diameter (with Chain Sub-assembly)

Specified Condition	Result
51.23 mm 2.02 in.	mm in.

NOTE:

The vernier caliper must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the chain sub-assembly and crankshaft timing sprocket.

Post-procedure1

None

INSPECT NO. 1 CHAIN TENSIONER ASSEMBLY

Push the plunger and check that it moves smoothly.

Plunger

If the plunger does not move smoothly, replace the No. 1 chain tensioner assembly.

INSPECT CHAIN TENSIONER SLIPPER

Using a vernier caliper, measure the wear depth of the chain tensioner slipper.

Depth

Maximum Depth

Specified Condition	Result
1.0 mm 0.0394 in.	mm in.

HINT:

Wear of the chain tensioner slipper starts from the part where the chain plate of the chain sub-assembly contacts.

If the depth is more than the maximum, replace the chain tensioner slipper.

INSPECT NO. 1 CHAIN VIBRATION DAMPER

Using a vernier caliper, measure the wear depth of the No. 1 chain vibration damper.

Depth

Maximum Depth

Specified Condition	Result
1.0 mm 0.0394 in.	mm in.

HINT:

Wear of the No. 1 chain vibration damper starts from the part where the chain plate of the chain sub-assembly contacts.

If the depth is more than the maximum, replace the No. 1 chain vibration damper.

INSPECT NO. 1 BALANCE SHAFT THRUST CLEARANCE

Using a dial indicator, measure the thrust clearance while moving the No. 1 balance shaft back and forth.

Standard Thrust Clearance

Maximum Thrust Clearance	Specified Condition	Result
0.09 mm 0.00354 in.	0.05 to 0.09 mm 0.00197 to 0.00354 in.	mm in.

If the thrust clearance is more than the maximum, replace the engine balancer assembly.

INSPECT NO. 2 BALANCE SHAFT THRUST CLEARANCE

Using a dial indicator, measure the thrust clearance while moving the No. 2 balance shaft back and forth.

Standard Thrust Clearance

Maximum Thrust Clearance	Specified Condition	Result
0.09 mm 0.00354 in.	0.05 to 0.09 mm 0.00197 to 0.00354 in.	mm in.

If the thrust clearance is more than the maximum, replace the engine balancer assembly.

INSPECT CYLINDER HEAD SET BOLT

for 140 mm cylinder head set bolt:

Using a vernier caliper, measure the diameter of the threads at the measurement point.

*a	Measurement Point
*b	105 mm

Standard Diameter

Measurement Point (Distance from the Seat)	Minimum Diameter	Specified Condition	Result
105 mm 4.13 in.	10.6 mm 0.417 in.	10.7 to 10.9 mm 0.421 to 0.429 in.	mm in.

If the diameter is less than the minimum:
Replace the cylinder head set bolt with a new one. Failure to do so may lead to engine damage.
If there is any thread deformation:
Replace the cylinder head set bolt with a new one.

for 150 mm cylinder head set bolt:

Using a vernier caliper, measure the diameter of the threads at the measurement point.

*a	Measurement Point
*b	115 mm

Standard Diameter

Measurement Point (Distance from the Seat)	Minimum Diameter	Specified Condition	Result
115 mm 4.53 in.	11.6 mm 0.457 in.	11.7 to 11.9 mm 0.461 to 0.469 in.	mm in.

If the diameter is less than the minimum, replace the cylinder head set bolt with a new one. Failure to do so may lead to engine damage.
If there is any thread deformation, replace the cylinder head set bolt with a new one.

INSPECT EXHAUST MANIFOLD

Using a precision straightedge and feeler gauge, check the surface that contacts the cylinder head sub-assembly for warpage.

Maximum Warpage

Specified Condition	Result
0.7 mm 0.0276 in.	mm in.

If the warpage is more than the maximum, replace the exhaust manifold.

INSPECT OIL NOZZLE VALVE SUB-ASSEMBLY

Form a 1.0 mm (0.0394 in.) diameter piece of wire to the shape shown in the illustration.

*a	1 mm (0.0394 in.)
*b	5 mm (0.197 in.)
*c	Check Valve
*d	Wire
	Move the wire in this direction.
	Movement of Check Valve

Using a piece of wire, check that the check valve is not stuck.

Hose

Connect a hose to the oil nozzle valve sub-assembly.

Check that air does not leak from the port (B) when blowing air into the port (A).

With the check valve depressed using a piece of wire, check that air flows from the port (B) when blowing air into the port (A).

*a	Hose
	Move the wire in this direction.
	Movement of Check Valve

Disconnect the hose from the oil nozzle valve sub-assembly.
If the oil nozzle valve sub-assembly is stuck, clogged or leaks, replace it.