Description
Cylinder head
The cylinder head is manufactured of specially alloyed
cast iron. It is provided with replaceable valve seats for
the inlet valves.
The cylinder head is screwed onto the cylinder block
with screws. The tightening of the cylinder head should
be done in three stages.
Cylinder block
The cylinder block is cast in one piece of specially al-
l
oyed cast iron.
Pistons, piston rings
The pistons are manufactured of a light-weight metal al-
l
oy. They are fitted with three piston rings (chromium-
plated) - two compression rings and an oil ring.
Camshaft
The injection pump is driven from the front part of the
camshaft by means of two or three separate cams (de-
pending on the number of cylinders).
The feed pump is driven via an eccentric cam from the
rear of the camshaft.
Timing gears
The timing gears consists of cylindrical gears with be-
velled cogs.
The camshaft and sea water pump are driven from the
crankshaft gear via an intermediate gear. The engine's
oil pump is built into the intermediate wheel and is dri-
ven via this. Regulator weights are suspended in the
front edge of the camshaft gear.
2 4
Engine body
Crank mechanism
Crankshaft
The crankshaft is journaled in three main bearings
(
MD2010
),
or four main bearings (other engines). The
axial bearing onMD2040 consists of loose thrust wash-
ers placed at the rear main bearing. On the other en-
gines the rear main bearing cap is made of aluminium
and serves as thrust washers. The crankshaft is statically
and dynamically balanced and has induction hardened
bearing surfaces. At the front the crankshaft is fitted with
a key joint and at the rear with a flange on which the fly-
wheel is attached.
Main and big-end bearings
The main and big-end bearings consist of steel shells
li
ned with bearing metal. The bearings are precision
milled and ready for installation. Two oversizes are
available as spare parts.
Note:
The thrust washers for the crankshaft's axial bear-
i
ng are not available in oversize.
Connecting rods
The connecting rods have I-sections. The piston bolt end
i
s through-drilled for lubrication of the gudgeon pin.
Flywheel
The flywheel is screwed on a flange on the rear of the
crankshaft. It is statically balanced and fully processed.
The starter ring is shrunk onto the flywheel.
A flexible coupling with damper element of rubber is
screwed on the flywheel. The coupling transfers the
force to the reverse gear/S-drive.
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