Yanmar — Cooling water system leak check
Testing & diagnosis · Cooling system
From a Yanmar service manual — check it applies to your exact model before use.
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Procedure
- Fill coolant water to the normal level in the radiator and install the cap tester
- Operate the manual pump to set the pressure to 0.09+0.015MPa (0.9+0.15kgf/cm2)
- If the cap tester gage reading drops, water is leaking; check the leaking point
Tools required
- Cap tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Test pressure 0.09+0.015MPa (0.9+0.15kgf/cm2)
Source: Yanmar 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.