Briggs & Stratton — Pressure Testing Cooling System
Testing & diagnosis
From a Briggs & Stratton service manual — check it applies to your exact model before use.
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Before you start
- The cooling system is pressurized. Do not remove the radiator cap while the engine is hot. Wrap a thick rag around cap while removing; slowly turn cap counterclockwise to the first stop, then press down and continue turning.
Procedure
- Remove radiator cap and make sure coolant is at correct level — no more than 25 mm (1 in.) below bottom of filler neck.
- Install cooling system pressure tester on radiator and pressurize system to 0.75 Bar (11 psi).
- Check hoses and connections (also for excessive bulging), radiator, water pump, intake manifold and bypass hose, and freeze plugs.
- System must maintain pressure during test.
- If pressure is not maintained and no external leaks found, check for internal leak such as blown head gasket or warped cylinder head or cylinder block.
Tools required
- Cooling system pressure tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pressurize to 0.75 Bar (11 psi)
Source: Briggs & Stratton 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.