Hilborn Technical Support - Mechanical - Miscellaneous
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Leak Tester Instructions

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The HILBORN leak tester is a cylinder leak tester as well as a fuel injector leak tester. Hoses and spark plug adapters are provided for both uses. The large #H6 hose attaches to the metering valve, while the smaller #H3 hose is for the nozzles.
To operate, install an inlet air fitting (not supplied) of your choice and supply the gauge with at least 80 psi. Turn back the regulator knob to ZERO on the gauge. Attach #H6 hose to the metering valve or spark plug adapter. Plug in a quick-disconnect adapter. Leakage will read on gauge.
NOTE: When checking the metering valve assembly, the “S” secondary by-pass valve must be capped off. Leakage is always read in the idle position.