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Hello
Toyota doesn't use a fixed Orifice, they use what is called an "Expansion Valve" both part serve the same purpose to lower the pressure of a high pressure fluid to a low pressure gas. The expansion valve is located at the inlet to the AC evaporator core in the dash. Below is a picture of the valve.
This engine utilizes shims to set proper clearances, you will need a micrometer, valve clearance adjustment tool set for shimmed lifters,small magnetic arm, appropriate shim selecting charts (manufacturer will have this if you can get the nec. measurements).
Measure thickness of shims removed (using micrometer) and use this formula where T=Thickness of old shim; A=Valve clearance measured; N=Thickness of new shim required.
Intake valves: N = T + (A - 0.02 mm (0.008 in.))
Exh. valves: N = T + (A - 0.25 mm (0.010 in.))
Then you need to find shims as close as possible to the calculated values.
Valve clearances (cold) are as follows:
Intake0.15 - 0.25 mm (0.006 - 0.010 in.)
Exhaust0.20 - 0.30 mm (0.008 - 0.012 in.)
Note, if you are not familiar with precision measuring using a micrometer, this may be better left to a trained tech. These are high revving little power plants and you don't want a problem at 8K rpm.
You need an aftermarket serviice manual from Haynes or Chilton.
They will have that kind of info.
I know of no car (I don't know them all) where that is needed and depending on the cover material (sheet steel or cast), could lead to warping and new leaks.
I always use a thin film of silicone whether it is specified or not and there are torque specs for ALL valve covers I have ever seen.
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