
To properly monitor engine performance, record the fol-
lowing parameters. To limit dynamometer operating time,
instrument the engine to make as many checks as pos-
sible.
• Engine speed rpm with a verified tachometer
• Fuel pressure
• Fuel rate
• Fuel temperature (if needed to correct fuel rate)
• Fuel inlet restriction
• Fuel drain line restriction
• Intake manifold pressure
• Intake air restriction
• Exhaust air restriction
• Coolant temperature
• Engine blowby
• Lubricating oil pressure
• Coolant pressure
• Inlet air temperature
Engine Speed (RPM) With a Verified Tachom-
eter
Use digital optical tachometer, Part No. 3377462, to check
and verify engine speed.
Fuel Pressure (STC Engines Only)
Measure the fuel pressure on STC engines. Install the
pressure gauge, Part No. ST-435-6, or the pressure gauge
in the fuel measuring device, Part No. 3376375, to the
CompuchekW fitting on the fuel shut-off valve.
NOTE: Pressure gauge, Part No. ST-435-6, is included with
snap rail pressure gauge, Part No. 3375932.
General Test Procedure - Chassis Dynamometer (14-05) Engine Testing
N14Page 14-32
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