Tappet Clearance my tappets are making a noise and i have consulted a relative who is a mechanic and he has asked me to get the tappet clearance for a toyota Hilux 1996 model RN85R 2.4L petrol

The most common setting for those engines is 0.14mm for Both valves.

Tappets making noise on a 4Y petrol engine 2.2 may be caused by a few different things. Here are a few possible causes and solutions:

1. Lack of oil pressure - If the engine is low on oil, the oil pump may not be able to provide enough pressure to properly lubricate the tappets. Check the oil level and top it up if necessary.
2. Worn tappets - Tappets can wear out over time, especially if the engine has high mileage. Worn tappets can cause noise and can be replaced.
3. Loose tappet adjusters - Tappet adjusters can become loose, which can cause noise. Tighten the adjusters according to the manufacturer's specifications.
4. Valve clearance - The valve clearance may need to be adjusted. if the clearance is too tight or too loose, it can cause noise.
5. Dirty engine - If the engine is dirty, the tappets may become clogged with debris, causing the noise. Clean the engine thoroughly to remove any debris.
6. Oil Quality - If the oil you are using is not of good quality or if it is too thick, it will not lubricate the tappets properly, causing the noise.

It's important to follow the manufacturer's instructions and use the right tools and equipment when working on the machine. If you are not familiar with the mechanical systems, it's best to take the vehicle to a qualified mechanic to diagnose and fix the issue.

A sure sign that it's time for a valve lash adjustment is if your engine is making a loud clicking or tapping noise when starting up or if you experience a loss in engine power. You can find more details on the suggested adjustment frequency here.
https://www.allstatepeterbilt.com/blog/valve-adjustments-explained

How To Check Tappet Clearance

1. Taking all safety precautions.
2. Make sure the piston is on TDC. ...
3. Make sure the engine has cooled down.
4. Loosen the lock nut of the rocker arm.
5. Now adjust the tappet clearance between the rocker arm & valve stem by tightening or loosing the nut below the lock nut.

https://www.marinesite.info/2012/02/1why-tappet-clearances-is-given-and-how.html

To adjust the valve clearances, use a spanner or a socket wrench on the crankshaft-pulley bolt. Turn the engine in its normal direction of rotation until No. 1 piston is at the top dead centre ( TDC ) of the compression stroke .
https://www.howacarworks.com/engine/checking-and-adjusting-valves

The valve tappet clearance for the Mazda Bongo Brawny can vary depending on the specific engine model and year. Here are some general specifications for the different engine types: 2.0L FE engine: Intake valve clearance - 0.18-0.22mm, Exhaust valve clearance - 0.28-0.32mm 2.5L WL engine: Intake valve clearance - 0.20-0.25mm, Exhaust valve clearance - 0.30-0.35mm 2.5L RF engine: Intake valve clearance - 0.20-0.25mm, Exhaust valve clearance - 0.30-0.35mm It's important to note that the valve tappet clearance should be checked and adjusted by a qualified mechanic using the correct specifications and tools. Incorrect adjustment can cause engine damage and poor performance.

I DON'T KNOW HOW MANY MILES ARE ON THE ENGINE. Found no bulletins for noise concern
Intake tappet clearance should be .006"-.010" and
Exhaust clearance should be .010"-.014"

Pulsar 135 original tappet clearances
INTAKE VALVE 0.05 mm
EXHAUST Valve 0.10 mm
Get this valve adjustment done by the experienced mechanic with the help of Feeler Gauge

Modern cars are hydraulically adjusted at the tappets so there is no adjustment. However the pivot points for the rockers can become seriously worn giving the same noise. The hydraulic tappets them selves wear and allow the oil pressure to drain off too quickly meaning there is a clearance every time the cam activates the tappet. I would have a leak down test done on the hydraulic tappet units and check the rocker shafts for excessive wear.

You will need a "tappet gauge/blade" and then here is what you have to do:
1. open engine head, its the cover of engine where HONDA is written.
2. Now jack up and one side of the car and put the car in 4th gear
3. Start from any one side, if the tappet is not in "UP" position then rotate the wheel (the jacked up side of car) and once the tappet moves up, stop there.
4. Loosen the nut of the tappet and put the tappet blade in between the tappet gap. Now using screw driver, tighten the tappet so that blade fits snugly between the gap and without moving anything (blade and screw driver) ask a helper to tighten the tappet nut finally.
5. Repeat above procedure for each tappet.

If you do it carefully, there will be no tappet sound at all.

When setting tappets, it has to be born inind that the valve stem wears an indentation into the face of the rocker. This prevents a really accurate tappet adjustment, so the customer is right again. If you do not posess a tappet setting dial gauge, a normal engineers dial gauge will do just as well. The procedure is the same as using your feeler gauge except that you set the dial gauge up on the cylinder head with the pointer resting on the head of the rocker. Press down fairly firmly on the rocker valve end and zero the gauge. Next lift up on the rocker and read off the clearance, from the gauge, Use a magnetic base to support your gauge and repeat the pocedure for each valve pair.

On the intake 0.0008 or 0.0020 (it's in between these 2)

this is for the stem to guide clearance. (for the intake)

The Exhaust 0.0018 to 0.0030 stem to guide clearance.