Service Manual

Injector ISB, ISBe and QSB (Common Rail [...]
Page 6-74 Section 6 - Injectors and Fuel Lines - Group 06
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Initial Check
WARNING
Fuel can be returned at highly elevated temperatures.
Wear safety glasses and protective gloves and
clothing when performing this test. To reduce the
possibility of personal injury, avoid contact with
returned fuel.
WARNING
The pressure within the fuel rail is sufficient to
penetrate the skin and cause serious personal injury.
Wear gloves and protective clothing.
For Marine applications, open fuel supply and return
valves.
Start the engine. Start INSITE™ electronic service tool
Fuel Leakage Test and allow the injectors to get up to
operating temperature for at least 1 minute. By allowing
the injectors to get up to operating temperature, more
accurate fuel flow measurements can be made.
This test elevates the fuel rail pressure.
With the fuel drain hose, Part Number 3164618 in a
graduated cylinder, measure the injector drain flow for 1
minute.
Flow Specification: INSITE™ Fuel Leakage Test
active
4-cylinder 200 ml per minute [6.8 fl-oz
per minute] maximum
6-cylinder 300 ml per minute [10.1 fl-
oz per minute] maximum
Flow Specification: Standard Idle Conditions (leak
may not be detected)
4-cylinder 120 ml per minute [4 fl-oz
per minute] maximum
6-cylinder 180 ml per minute [6 fl-oz
per minute] maximum
If the engine will not start, crank the engine and measure
the amount of fuel returned from the injectors.
Flow Specification: Engine Cranking
4- and 6- cylinder 90 ml per minute [3 fl-oz
per minute maximum]
NOTE: Be sure not to overheat the starter.
If fuel flow is greater than specification, it is necessary to
perform the injector isolation test described below.