Kohler Ford LSG-423 — Cooling System Pressure Test
Testing & diagnosis
For the Kohler Ford LSG-423, from the Kohler service manual.
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Before you start
- Let the engine cool before removing the radiator cap
- Place a cloth over the cap and rotate slowly counterclockwise to the safety stop to allow pressure to escape
Procedure
- Shut the engine off and let the engine cool before removing the radiator cap
- Adjust the radiator coolant (fill or drain) to one inch below the filler neck opening before testing
- Wet the rubber sealing surface of the cap before installing the cap tightly on the radiator
- Disconnect the electrical connector from the engine temperature sending unit and remove the sending unit
- Install the adapter fitting from the Rotunda Pressure Tester 21-0012 into the intake manifold or cylinder head in place of the sending unit
- Insert the free end of the radiator overflow hose into a container of water
- Attach the pressure pump and gauge and pressurize the cooling system to the cap lower limit
- Gradually increase system pressure until a slight stream of bubbles appears; this is the upper limit of the pressure cap
- Pressurize the system and observe the gauge reading for approximately two minutes; pressure should not drop
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pressure should not drop during approximately two minutes
Source: Kohler 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.