Valve Clearance: Adjustment

See REMOVAL

See REMOVAL

1. Rotate the crankshaft clockwise to set the No. 1 cylinder to TDC compression by aligning the crankshaft pulley timing mark (notch) with the timing chain cover 0° position
   Fig 1: Aligning Crankshaft Pulley Timing Mark With Timing Chain Cover 0° Position

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that each timing mark is positioned as shown in the illustration.

   HINT

   If the timing marks are not positioned as shown in the illustration, rotate the crankshaft 360° to align the timing marks.

1. Using a feeler gauge, measure the clearance between the indicated valve rocker arms and camshafts.
   Fig 2: Locating Valves

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Valve Clearance (Cold) 

   VALVE CLEARANCE SPECIFICATION (COLD)
   
   

   Item	Specified Condition
   Intake	0.12 to 0.18 mm (0.00472 to 0.00709 in.)
   Exhaust	0.22 to 0.28 mm (0.00866 to 0.0110 in.)

   HINT:

   • On this engine, valve clearance is measured between the valve rocker arms and the camshaft lobes The shims used to adjust the valve clearance are located on the top of the valve stems
   • The valve clearance shown in the Standard Valve Clearance table is the clearance as measured between the cam lobe and valve rocker arm.
   • Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve adjusting shim
2. Turn the crankshaft 1 revolution (360°) to set the No. 6 cylinder to TDC compression
3. Using a feeler gauge, measure the clearance between the indicated valve rocker arms and camshafts.

Fig 3: Locating Valves

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Valve Clearance (Cold) 

HINT:

• On this engine, valve clearance is measured between the valve rocker arms and the camshaft lobes The shims used to adjust the valve clearance are located on the top of the valve stems.
• The valve clearance shown in the Standard Valve Clearance table is the clearance as measured between the cam lobe and valve rocker arm.
• Record any out-of-specification valve clearance measurements They will be used later to determine the required replacement valve adjusting shim.

1. Remove the timing chain cover sub-assembly (See REMOVAL ).
2. Remove the camshaft (See REMOVAL ).
3. Raise the valve rocker arm above the shim being replaced, and remove the valve adjusting shim
   NOTE:

   • Be careful not to drop the adjusting shim into the cylinder head.
   • To prevent damage, do not attempt to adjust valve clearance by tightening or loosening the valve rocker arm pivots.

   HINT:

   Arrange the removed parts in the correct order.

   Fig 4: Identifying Valve Rocker Arm And Valve Rocker Arm Pivots

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Using a dial gauge, measure the thickness of the existing valve adjusting shim after removing it.

   HINT:

   Be careful not to measure at the valve adjusting shim center groove.

   Fig 5: Measuring Thickness Of Existing Valve Adjusting Shim

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Determine the replacement valve adjusting shim thickness according to the formula or charts below.
   1. Calculate the thickness of the replacement valve adjusting shim so that the valve clearance comes within the specified value
   VALVE ADJUSTING SHIM THICKNESS FORMULA
   
   

   T2	Thickness of replacement shim
   T1	Thickness of existing shim
   A	Measured valve clearance

   Valve clearance: 

   Intake: 

   T2 = T1 + (A - 0.15 mm (0.0059 in.)) x 1.8 

   Exhaust: 

   T2 - T1 + (A - 0.25 mm (0.0098 in.)) x 1.6 

   This example is provided only as a calculation example, based on the clearance adjustment of an intake valve If non-metric units are being used, substitute those measurements for the values shown below

   Step 1 - Determining the amount of excess clearance

   • The specified clearance (0 15) is subtracted from the measured value (0 40), and the result is then multiplied by the rocker ratio compensation value (1 8)
   • (Measured value - specification) x compensation value = amount of excess clearance
   • (0 40-0 15) x 1 8 = 0450

   Step 2 - Using the existing valve adjusting shim to determine the required thickness of the replacement valve adjusting shim

   • The amount of excess clearance (0 450) is added to the thickness of the existing valve adjusting shim (2 300) The resulting value is the ideal thickness of a replacement valve adjusting shim
   • Excess clearance + thickness of existing shim = thickness of ideal replacement shim
   • 0.450 + 2.300 = 2.750

   Step 3 - Select the valve adjusting shim closest to the thickness of the ideal replacement shim

   • Compare the thickness of the available replacement valve adjusting shims to the ideal replacement shim and choose the shim that is the closest match
   • Closest replacement valve adjusting shim = 2.750 (Select a new No 74 shim)

   HINT

   • Select a replacement shim with a thickness as close to the calculated value as possible.
   • Shims are available in 41 sizes in increments of 0.020 mm (0.0008 in.), from 2.000 mm (0.0787 in.) to 2.800 mm (0.1102 in.).
   • To select a replacement valve adjusting shim, refer to the following Valve Adjusting Shim Selection Chart and New Shim Thickness tables
   Fig 6: Valve Adjusting Shim Selection Chart (Intake)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Intake valve clearance (Cold): 

   0.12 to 0.18 mm (0.00472 to 0.00709 in.) 

   EXAMPLE:

   If the existing shim (installed shim) is 2.300 mm (0.0906 in.), and the measured clearance is 0.39 mm (0 0154 in.), then a new 2.740 mm (0.1079 in.) No. 74 shim should be used as a replacement for the existing shim.

   New Shim Thickness mm (in.) 

   SHIM THICKNESS SPECIFICATION
   
   

   Shim No.	Thickness	Shim No.	Thickness	Shim No	Thickness
   00	2 000 (0 0787)	28	2 280 (0 0898)	56	2 560 (0 1008)
   02	2 020 (0 0795)	30	2 300 (0 0906)	58	2 580 (0 1016)
   04	2 040 (0 0803)	32	2 320(0 0913)	60	2 600(0 1024)
   06	2 060(0 0811)	34	2 340(0 0921)	62	2 620(0 1031)
   08	2 080(0 0819)	36	2 360 (0 0929)	64	2 640(0 1039)
   10	2 100(0 0827)	38	2 380 (0 0937)	66	2 660(0 1047)
   12	2 120(0 0835)	40	2 400 (0 0945)	68	2 680(0 1055)
   14	2 140 (0 0843)	42	2 420 (0 0953)	70	2 700(0 1063)
   16	2 160(0 0850)	44	2 440(0 0961)	72	2 720(0 1071)
   18	2 180(0 0858)	46	2 460 (0 0969)	74	2 740(0 1079)
   20	2 200 (0 0866)	48	2 480 (0 0976)	76	2 760(0 1087)
   22	2 220 (0 0874)	50	2 500 (0 0984)	78	2 780(0 1094)
   24	2 240 (0 0882)	52	2 520 (0 0992)	80	2 800(0 1102)
   26	2 260 (0 0890)	54	2 540(0 1000)

   Fig 7: Valve Adjusting Shim Selection Chart (Exhaust)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Exhaust valve clearance (Cold): 

   0.22 to 0.28 mm (0.00866 to 0.0110 in.) 

   EXAMPLE.

   If the existing shim (installed shim) is 2 300 mm (0.0906 in), and the measured clearance is 0 39 mm (0.0154 in), then a new 2.520 mm (0 0992 in.) No 52 shim should be used as a replacement for the existing shim.

   New Shim Thickness mm (in.) 

   SHIM THICKNESS SPECIFICATION
   
   

   Shim No.	Thickness	Shim No.	Thickness	Shim No.	Thickness
   00	2 000 (0 0787)	28	2 280 (0 0898)	56	2 560(0 1008)
   02	2 020 (0 0795)	30	2 300 (0 0906)	58	2 580(0 1016)
   04	2 040 (0 0803)	32	2 320(0 0913)	60	2 600(0 1024)
   06	2 060(0 0811)	34	2 340(0 0921)	62	2 620(0 1031)
   08	2 080(0 0819)	36	2 360 (0 0929)	64	2 640(0 1039)
   10	2 100(0 0827)	38	2 380 (0 0937)	66	2 660(0 1047)
   12	2 120(0 0835)	40	2 400 (0 0945)	68	2 680(0 1055)
   14	2 140(0 0843)	42	2 420 (0 0953)	70	2 700(0 1063)
   16	2 160(0 0850)	44	2 440(0 0961)	72	2 720(0 1071)
   18	2 180(0 0858)	46	2 460 (0 0969)	74	2 740(0 1079)
   20	2 200 (0 0866)	48	2 480 (0 0976)	76	2 760(0 1087)
   22	2 220 (0 0874)	50	2 500 (0 0984)	78	2 780(0 1094)
   24	2 240 (0 0882)	52	2 520 (0 0992)	80	2 800(0 1102)
   26	2 260 (0 0890)	54	2 540(0 1000)

6. Install the camshaft (See INSTALLATION )
7. Install the chain sub-assembly (See REASSEMBLY ).
   1. Install the chain sub-assembly (for Bank 2)
   2. Install the No 1 chain vibration damper (for Bank 2)
   3. Install the chain tensioner slipper (for Bank 2).
   4. Install the No 1 chain tensioner assembly (for Bank 2)
   5. Install the chain sub-assembly (for Bank 1).
   6. Install the No 1 chain vibration damper (for Bank 1)
   7. Install the chain tensioner slipper (for Bank 1)
   8. Install the No 1 chain tensioner assembly (for Bank 1).
   9. Tighten the camshaft timing gear assembly
8. Inspect the valve clearance again
   NOTE: Be sure to inspect the valve clearance with the chain cub-assembly installed. When rotating the camshaft without the chain sub-assembly installed, contact between the valves and pistons may occur.

   HINT

   If the valve clearance is not as specified, readjust the valve clearance.

See INSTALLATION

See INSTALLATION