Yanmar YM276 Service Manual page 495

Fuel System
230-10-1 1
TESTING FUEL INJECTION VOLUME
1. Align the mark (B), of the fuel control rack with the reference
surface (A).
A
-
Reference Sulface
B
-
Punch Mwk
C -Control Rack
2. Set the re'volution speed of the pump camshaft at 1500 rpm.
INJECTION VOLUME SPECIFICATION
ENGINE Camshaft Sped lnjenion Volurn
3T84HA 1500RPM 22.5 to 23.5 mP/1000 Stroke
(0.79 to 0.83 oz/1000Strokel
3. Check fuel injection nozzle.
INJECTION NOZZLE SPECIFICATIONS
Type
. . . . . . . . . . . . . . . .
YND-OSDYD1
Injection pressure
. . . . . . . .
15.68 Mpa
(160 kgf/cm21 (2275 psi)
Calibration fluid
. . . . . . . . .
SAE J967C calibrating
Fuel feed pressure.
. . . . . . .
49 Kpa
(0.5 kgf/cm2) (7 psi)
. . . . . . .
Fuel injection pipe
Use the same dimension a s the
engine's
FUEL INJECTION NOZZLES
GENERAL INFORMATION
They Yanmar YDN-OSDYD1 injection nozzles are of the single-
hole, inward.opening, throttle type. Throttle nozzles are common-
ly used on engines having precombustion chamber design, because
the spray pattern produced through the single hole opening works
well in a high air swirl environment of the precombustion chamber.
Nozzle valve opening pressure i s set at 15.68 Mpa (160 kg/cm2)
-
(2275 psi). Addition or deletion of shims regulates the opening
pressure.
SME2760/1JB104 YM276 and 276D
~ i n o m a f o . Printed in Japan