My hyundai h100 bakkie engine block is broken from a shooting piston and it has a hole how do i fix i

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

THERE 2, READING,
ONE INLINE IF PISTON PIN
AND ONE 90DEGRESS FROM THAT.
PISTONS ARE NOT ROUND THEY ARE CAM GROUND/MILLED
THE SERVICE MANUAL COVERS ALL THAT.
Hyundai Grace diesel H100
NO YEAR TOLD THE MANUAL IS BY YEAR, AND MODEL AND COUNTRY.
1968 TO PRESENT MADE
GRACE 1986 IN KOREA.
3 ENGINES , NO COUNTRY TOLD AND BOOKS ARE BY COUNTRY AND YEAR GRACE

CALL UP OEM Hyundai, AND BUY THE MANUAL
Diesel engine's:
2476 cc 4D56 I4
2476 cc 4D56 TD I4 (TURB0) YES TURBO'S CAN HAVE DIFFERENT PISTIONS
2607 cc D4BB I4 (China)

What exactly do you mean by an "overhaul"? More information please. Which diesel engine is this? The 2.5 litre or the 2.6 litre? What year is your vehicle? Some engines can be different settings depending on the size it is.
I'm assuming this is for the clearance between the valve rockers and the spring end of the valves?
If you're breaking rockers your mechanical timing might not be set correctly risking bent valves or the valves are already bent. Even One tooth out on the timing belt/chain can cause problems. You might need to take the cylinder head off to check the valves.
When you set the clearances the engine needs to be Cold and the cylinder you're working on needs to be at Top Dead Centre (TDC) to make sure the valves are closed. On an inline 4 cylinder engine the cylinders work as pairs, 1 and 4, 2 and 3.
Set cylinder number 1 to TDC. Set the clearances for only cylinders 1 and 4. Using the crank pulley bolt turn cylinder 1 to Bottom Dead Centre, (180' turn clockwise). This should bring cylinders 2 and 3 to TDC so you can set those clearances.
Is the engine burning the oil? (a thicker, more blue exhaust smoke than normal). Burning oil can also be a sign of a blown head gasket or badly worn piston rings.

The valve clearance specification for a 1998 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)
The tappet setting for this engine will depend on the specific valve clearance measurements for each valve. If the valve clearances are found to be outside of the specification, the tappet settings will need to be adjusted accordingly. It is recommended to refer to the manufacturer's service manual for detailed instructions on how to perform the adjustment procedure.

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Does this vehicle run hot or overheat?Is the engine light on?
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wreckers , spare parts at service dealer, engine reconditioner engineering shops
get yours ground

the liner sits 1mm above the deck of the block and the piston top is level with the top of the liner.

You might have a stuck piston ring allowing compression to leak inside the oil sump

See exploded view


REMOVAL
1. Drain the coolant down to thermostat level or below. 2. Remove the coolant outlet fitting and gasket. 3. Remove the thermostat