ENGINE
M6040, M7040, WSM
1-S21
• Check the nozzle injection pressure and condition after confirming that there is nobody standing in the
direction the spray goes.
• If the spray from the nozzle directly contacts the human body, cells may be destroyed and blood
poisoning may be caused.
9Y1210143ENS0017US0
Nozzle Spraying Condition
1. Attach the injection nozzle to the nozzle tester, and check the
nozzle spraying condition.
2. If the spraying condition is defective, replace the injection
nozzle assembly or repair at Denso service shop.
9Y1210143ENS0018US0
Checking Nozzle Injection Pressure
1. Attach the injection nozzle to the nozzle tester.
2. Slowly move the tester handle to measure the pressure at which
fuel begins jetting out from the nozzle.
3. If the measurement is not within the factory specifications,
replace the injection nozzle assembly or repair at Denso service
shop.
• Injection nozzle gasket must be replaced when the
injection nozzle is removed for checking.
9Y1210143ENS0019US0
Valve Seat Tightness
1. Attach the injection nozzle to the nozzle tester.
2. Raise the fuel pressure, and keep at 16.67 MPa (170 kgf/cm
2
,
2418 psi) for 10 seconds.
3. If any fuel leak is found, replace the injection nozzle assembly
or repair at Denso service shop.
9Y1210143ENS0020US0
(a) Good (b) Bad
Injection pressure
Factory
specifi-
cation
1st stage
18.64 to 19.61 MPa
190.0 to 200.0 kgf/cm
2
2703 to 2844 psi
Valve seat tightness Factory specification
No fuel leak at
16.67 MPa
170.0 kgf/cm
2
2418 psi
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