Continental Motors O-200-D, Инструкция по установке и эксплуатации, Страница: 32 / 112

2-10 O-200-D & X Series Engine Installation and Operation Manual
3 January 2017
Engine Description
2-3. Detailed Engine Description
2-3.1. Crankcase
Two aluminum alloy castings are joined along the vertical center plane to form the
crankcase. The individual castings (with studs and inserts) are referred to as the “left
crankcase” and “right crankcase.” The crankcase provides a tight enclosure, sufficiently
rigid to support the crankshaft, camshaft and bearings, with oil galleries for lubrication.
The upper and lower backbones (spines) are sealed by fourteen hex head screws, washers,
and plain nuts, two of which attach the engine lifting eye to the upper flanges. Each
casting has two machined cylinder mount pads. Cylinder openings in pads on the two
sides of the case are offset to align with the connecting rod journal for each piston.
Cylinder pads and case webs are stiffened by integral ribs cast in the crankcase. A
counterbore around the crankshaft opening in the front of the case receives the crankshaft
oil seal. A groove at each end of the front main bearing boss accommodates thrusts
washers.
Saddles for precision steel-backed crankshaft main bearing inserts are line bored through
web bosses. Camshaft bearings are bored directly in the case metal. Bearings are divided
equally by the parting surface, camshaft bearings being directly below the main bearings.
Crankcase halves are retained by through studs installed in the bosses above and below the
front and rear main bearings, two through bolts installed in lieu of two through studs at the
center bearing bosses and one through stud below the rear camshaft bearing. In addition to
the through studs and through bolts, cylinder mount pads have short studs to secure the
cylinder to the crankcase.
Figure 2-4. Crankcase Features
REAR CRANKSHFT
BEARING BORE
Cyl #2 Cyl #4
2-4 OR L/H
CRANKCASE HALF INTERMEDIATE
CRANKSHAFT BEARING BORE
BACKBONE
CRANKSHAFT NOSE
SEAL LAND
FRONT
CRANKSHAFT
BEARING BORE
CAMSHAFT
BEARING BORE
TAPPET
GUIDES
SPINE BELOW
CAMSHAFT
CAMSHAFT
BEARING BORE
OIL SUMP
MOUNT FLANGE
ACCESSORY CASE
MOUNT FLANGE
TAPPET
GUIDES
REAR CRANKSHFT
BEARING BORE
Cyl #2 Cyl #4
REAR CRANKSHFT
BEARING BORE
Cyl #2 Cyl #4
2-4 OR L/H
CRANKCASE HALF INTERMEDIATE
CRANKSHAFT BEARING BORE
BACKBONE
CRANKSHAFT NOSE
SEAL LAND
FRONT
CRANKSHAFT
BEARING BORE
CAMSHAFT
BEARING BORE
TAPPET
GUIDES
SPINE BELOW
CAMSHAFT
CAMSHAFT
BEARING BORE
OIL SUMP
MOUNT FLANGE
ACCESSORY CASE
MOUNT FLANGE
TAPPET
GUIDES