Volvo Penta — Cleaning the cooling system
Maintenance
From a Volvo Penta service manual — check it applies to your exact model before use.
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Before you start
- The oxalic-acid solution is poisonous and harmful to the skin
- On no account use caustic soda
Procedure
- Empty the system and flush through with water.
- Dissolve 1 kg oxalic acid in 5 litres of hot water, pour into the system and top up with clean water.
- Run the engine at normal operating temperature for at least 2 hours (max. 12 hours).
- Empty the system and immediately flush very thoroughly with clean water.
- Mix 200 grams bicarbonate in 5 litres of water, pour in, top up with pure water and run about 15 minutes.
- Flush the system clean again; check all hoses and replace those not in good condition.
- Fill the system with coolant recommended by Volvo Penta.
Specs & values
- 1 kg oxalic acid in 5 litres hot water
- 200 g sodium bicarbonate in 5 litres water
Source: Volvo Penta service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.