Engine block crack repair product Holts 250ml

Engine block crack repair product Holts 250ml

Holts Wondarweld engine block repair additive, 250 ml, which is added through the cooling system to seal leaks in the block and cylinder head and can be used at home.

Use

The product goes into the coolant through the thermostat housing. NEVER ADD IT TO THE OIL.

External cracks:

1. Warm up the engine.
2. Remove the thermostat.
3. Shake the bottle well, pour the contents through the thermostat hole and refit its cap.
4. Top up the radiator with hot water and fit the cap.
5. Start the engine and keep the revs high for 15 minutes. Take care that it does not boil. Switch off the engine and top up with hot water if needed. Let the engine cool.
6. Leave the product in the system for 2-3 days while driving normally, drain the coolant when cold, and refit the thermostat.

Internal cracks:

1. Repeat steps 1 to 4 above.
2. Remove the spark plug from the faulty cylinder and run the engine for 20 minutes. If more than one cylinder is faulty, remove the plugs one after another at 5-minute intervals, so that each cylinder runs for 20 minutes without a plug.
3. Let it cool. Drain the water, refit the thermostat and top up with clean water.
4. Drain the oil, flush and fill with new oil.

Small cracks:

1. Remove the thermostat.
2. Pour the contents of the pack into the radiator.
3. Refit the cap and run the engine until it warms up.
4. Leave the product in the system for 2-3 days while driving normally, drain the coolant when cold, and refit the thermostat.