Yanmar ViO12-2A, Service Manual

Page: 63 / 409

4. ENGINE
4-2-5
3) Nozzle Valve Sliding Test
Thoroughly wash the nozzle valve using clean fuel. Hold the nozzle
body vertical, and put the nozzle valve approx. 1 / 3 of its length into
the body.
Check if the nozzle valve falls smoothly by self-weight when released.
If so, the nozzle valve is good. In case of a new nozzle, remove the
seal peel, and immerse it in clean light oil or the like to clean its inner
and outer surfaces and thoroughly remove rust-preventive oil before
using the nozzle. Note that a new nozzle is immersed in rust-preven-
tive oil and then is pasted with a seal peel to shut off the outside air.
4) Nozzle Body Identification Number
4-2-5 Checking and Adjusting Fuel Injection Timing
Note:
The following procedure is performed on the No. 1 cylinder. While checking and adjusting the timing on only No. 1
cylinder is usually sufficient, the same procedure can be performed on any or all cylinders.
1) Checking Fuel Injection Timing
Note:
Some fuel may drain from the fuel injection pump during this process. Make provisions to contain and dispose of any
such spillage.
(1) Turn the key switch to the ON position for 10 to 15 seconds. This will allow the fuel transfer pump to prime the
fuel system.
Note:
Never use the starter motor to prime the fuel system. This may cause the starter motor to overheat and damage the
coils, pinion gear and / or ring gear.
(2) Clean the area around the fuel injection pump.
Note:
The stop solenoid must be removed to allow fuel to flow through the fuel injection pump.
(Nozzle valve sliding test by self-weight)
Size : Size P (or S)
Spray angle
Design code
: Throttle type Code D
: Pintle type No code
Type : Pintle type
YANMAR
Identification
number
Y YD1 D S - O DN