71-00-00
page 12
October 01/2010
Effectivity 912/914 Series
Edition 1 / Rev. 3
d04775
BRP-Powertrain
Maintenance Manual
1)
912 A, F, UL
2)
912 S, ULS, ULSFR
3)
914 F, UL
DESIGN:
4-cylinder horizontally opposed 4-stroke-engine
BORE:
79.5 mm (3.13 in.)
1) 3)
84 mm (3.31 in.)
2)
STROKE:
61.0mm (2.40in.)
DISPLACEMENT:
1211.2 cm³
1) 3)
1352 cm³
2)
CYLINDER:
Lightweight metal cylinder with Nikasil coated
running surface
PISTON:
Lightweight cast metal piston with 3 piston rings
CYLINDER HEAD:
4 individual cylinder heads
COMPRESSION:
9 : 1
1) 3)
11.1 : 1
2)
INTAKE VALVE:
38 mm (1.49 in.), valve seat surface hardened
EXHAUST VALVE:
32 mm (1.26 in.) NIMONIC, armor welding at
valve seat
VALVE CLEARANCE:
automatic compensation of clearance by hydraulic
valve tappets
VALVE TRAIN:
OHV, hydraulic valve tappets, pushrods and rocker
arms
CAMSHAFT:
steel, annealed, liquid nitriding
CONTROL TIME:
1) 3)
lo. 0°
T.D.C.
Oo. 48° before B.D.C.
(at 1 mm valve stroke):
Ic. 48° after B.D.C.
Oc. 0°
T.D.C.
2)
Io. 2°
before T.D.C. Oo. 48° before B.D.C.
Ic. 48° after B.D.C.
Oc. 2°
after T.D.C.
CRANKSHAFT:
supported in 5 plain bearings, case hardened
COOLING:
liquid cooled cylinder heads, ram air cooled cylinders
LUBRICATION:
1) Main oil pump circuit:
Dry sump forced lubrication system, trochoid pump
driven by the camshaft, oil return by the blow-by
gases
2) Suction pump circuit
:
3)
Extra trochoid pump driven by the camshaft returns
oil from the lower oil sump of the turbocharger to
the oil tank
OIL DELIVERY RATE:
1) Main oil pump:
approx. 16 l/min. at 5500 rpm
2) Suction pump circuit:
3)
approx. 4 l/min. at 5500 rpm
3.4)
Engine / Components
Summary of Contents for MMH-912 Series
Page 463: ......
