Kohler PCH680 / PCH740 — Fuel Injector Leakage Test
Testing & diagnosis · Fuel Injectors
For the Kohler PCH680 / PCH740, from the Kohler service manual.
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Before you start
- High Pressure Fluids can puncture skin and cause severe injury or death. Do not work on fuel system without proper training or safety equipment.
Procedure
- Remove manifold mounting bolts and separate throttle body/manifold from engine leaving TPS, high pressure fuel line, injectors and fuel line connections intact. Discard old gaskets.
- Position manifold assembly over container to capture fuel and turn key switch ON to activate/energize lock-off valve and pressurize system. Do not turn switch to START position.
- If either injector exhibits leakage of more than two to four drops per minute from tip, or shows any sign of leakage around outer shell, turn ignition switch OFF and replace injector.
Specs & values
- Leakage more than two to four drops per minute from tip indicates replacement
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.