Hitachi EX20UR-2 Manual page 306

ENGINE/General information
2. 3KR2 model
Engine model(s)
Items
3KR2 (EX4OUR-2)
Type
In-line water-cooled 4-cycle OHC diesel engine
Timing drive system Gear and chain system
Number of piston rings Compression rings 2, oil ring 1
No. of cylinders — bore X stroke (mm) 3 — 81 X 92
Piston displacement (cc) 1422
Compression ratio
21 : 1
19 : 1
Combustion chamber type In line swirl chamber type Direct injection type
Overall length X width X height (mm)
616 X 513 X 672
Dry weight
(kg)
154
Fuel injection timing (BTDC) 16'
Firing order 1 — 3 — 2
Fuel
Diesel fuel oil (JIS K-2204)
Idling speed (r.p.m.) 1200
Compression pressure (kg/cm2) 31 or more / 250 r.p.m.
Valve clearance (cold) (mm)
Intake 0.25
Exhaust 0.25
Valve
operating
timing
Intake valve
Open (BTDC)
12'
Close (ABDC) 48'
Exhaust valve
Open (BBDC)
51'
Close (ATDC) 9'
Injection pump Bosch type
Governor
Mechanical type
Nozzle Throttle type Hole type
Injection pressure
(kg/cm2)
120 220
Oil pump Trochoid type
Oil filter
Cartridge type
Lubricant capacity: Oil pan capacity (g)
Approx. 5.5
Generator (V—A)
12-35
Starter
(V—KW)
12-1.4
Note: Specifications are subject to change without notice.
W05-01-08