Valve clearance adjustment

Hyundai H100 2.6 diesel bakkie is: Intake valve clearance: 0.25 - 0.35 mm (0.010 - 0.014 in) Exhaust valve clearance: 0.45 - 0.55 mm (0.018 - 0.022 in)

https://www.google.com/search?q=2013+Hyundai+H100+valves+clearance

The valve clearance specification for a Volvo FL10 truck depends on the specific engine model and year of manufacture. Generally, the valve clearance for the FL10 truck with a Volvo D10 engine should be checked and adjusted as follows: Remove the valve cover: Remove the valve cover to access the valves. Rotate the engine: Rotate the engine to the top dead center (TDC) position for the cylinder you want to adjust. Check the valve clearance: Use a feeler gauge to check the clearance between the valve stem and the rocker arm. The specification for the valve clearance should be listed in the engine service manual. Adjust the valve clearance: If the clearance is not within the specified range, adjust the clearance by loosening the lock nut on the rocker arm and turning the adjustment screw. Tighten the lock nut when the clearance is correct. Repeat for each cylinder: Repeat the above steps for each cylinder. Reinstall the valve cover: Once all the valve clearances have been checked and adjusted, reinstall the valve cover. It is recommended to refer to the engine service manual for specific instructions and specifications for your particular Volvo FL10 engine.

Not all modern engines need you to set the valve clearances. Most engines use oil filled 'tappets' that self adjust the clearance as the oil temperature changes. Depending on which engine it is yours has a lot of the time you can only check the valve clearance but not adjust it.

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

Valve clearances are the small gaps between the tops of the valve stems and the part of the mechanism which presses on them to open the valves . Check the clearances at regular intervals as specified in the car service schedule, and adjust if necessary. Reset the clearances whenever the cylinder head has been removed.
https://www.howacarworks.com/engine/checking-and-adjusting-valves
Incorrect clearances can cause the engine's intake and exhaust valves to fail prematurely, which can lead to engine idle and drivability problems, as well as excess pollution. ... If the valves are too tight, the vehicle may also exhibit rough running characteristics either cold, hot or all the time.
https://www.quora.com/Why-happens-when-the-valve-clearance-is-high

Valve clearances are the small gaps between the tops of the valve stems and the part of the mechanism which presses on them to open the valves . Check the clearances at regular intervals as specified in the car service schedule, and adjust if necessary. Reset the clearances whenever the cylinder head has been removed.
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.

Valve clearance Google search your year make and model valve clearance. Check the attached links,instruction and guides, Good luck
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Checking and adjusting valves
Engine Valve Adjustment Procedure The Right Way
Valve Clearance Adjustment
Valve clearance Google Search

make sure engine is warmed up. Put cylinder one at top dead center,remove the valve cover,loosen all adjustment lock nuts,adust intake and exhaust valves on cyl #1 and intake valve on #2 and exhaust valve on #3. now rotate crankshaft 360 degrees clockwise, now adjust intake valves on cyl#3 and cyl #4 and exhaust valves on cyl #2 and cyl #4.now tighten lock nuts and install valve cover. specs are intake valves 25mm clearance and exhaust 28mm clearance, use a feeler gauge,heres a picture to show you where to check clearance.

Adjust the jet valve clearance before the adjustment of the
intake valve clearance.
Jet valve clearance (hot engine)
[Standard value]. . . . . . . . . . . . . . . . . . . 0.25 mm (0.010 in.)

now adjust valve clearance
Valve clearance (hot engine) [Standard value]
Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.15 mm (0.006 in.)
Exhaust. . . . . . . . . . . . . . . . . . . . . . . . . . 0.25 mm (0.010 in.)