Equipment

Instruction Book for Bolinder Single & Twin-cylinder Engines

Equipment

Reverse-Reduction Gearbox
BR and LBR diesels are equipped with a sturdy, highly reliable reverse-reduction gearbox. This
compact unit has been specially designed for convenient dismantling and reassembly. The same
gearbox is used for both the single and the two-cylinder engine.
The gearbox has a robust, effective over-centre friction clutch. It consists of two outer clutch plates
3 fig 21, with friction facing on both sides, which are pressed together between the outer 6 and
the inner 2 pressure plates against a plate 5 of hardened and tempered steel, mounted on a
coupling gear. Pressing together of the clutch is controlled by control lever 12 via a linkage. The
clutch is engaged when the lever is moved forward.

Astern drive is provided by a planetary gearing 8. A break band 1 prevents the planetary gear housing and it's planet wheel from rotating. The planetary gears are made of hardened
nickel-chrome steel and carried in needle bearings on case-hardened pins. The gearbox casing a double-ended lever 9. One end of this lever is fitted with a roller which bears against a cam on the
control lever attachment. When the control lever is moved backwards, the roller is lifted by the
cam and actuates the double-ended lever This makes the adjusting screw 7 the other end of the
lever press against the tensioning pin 4 so that the brake hand 1 is applied and engages the engine for astern drive.

The clutch plates for ahead drive are adjusted with setting ring 10, which is accessible once the
cover on the casing has been removed. The ring can be coated with a screwdriver or similar,
which is inserted in one of the holes, and is locked with the stop screw. If this screw should come opposite a lever so that it cannot be tightened, move the stop screw to the other threaded hole in
the setting ring.

The brake band for astern drive is adjusted with screw 7 on the outer lever. THE SUPPORT SCREW
ON THE OPPOSITE SIDE OF THE CASING SHOULD NOT BE LOOSENED OR RESET UNLESS THE
BRAKE BAND, ETC HAS TO BE REPLACED. When replacing the brake band, adjust these screws
so that the band does not touch the planetary gearing casing when the control lever is in it's
forward position. The easiest way to check this is to insert a piece of paper under the band all
round the casing. Lock the screws after adjustment.
The reduction gearing has hardened helical gears of nickel-chrome steel. Reduction ratio is 2
to 1 ( more exactly: 2.04: 1 ahead and 2.30: 1 astern) or 1.5 to 1 ( more exactly: 1.45: 1 ahead and 1.63: 1 astern ).

The entire reverse-reduction gearing works in a bath of oil and a sliding vane pump 13 built into
the casing also feeds extra lubricant to the planet wheel and needle bearings. The lower part of
the gearbox serves as an oil sump. Oil level must be maintained between the cranks on the
dipstick 11. Use the same oil as in the engine and change every 600 hours, or at least once a year.
Oil changing is facilitated by a pipe line between the sump to a crankcase pump on the engine.
The gearbox and the crankcase pump are connected when the cock on the suction side of the
pump is turned in towards the engine.

Bilge Pump
The engines can be fitted with a bilge pump of the same design as the coolant pump. The pump
is then V-belt driven from the camshaft via a manually operated friction clutch.

Bailing Pump
The LBR diesel engine is a watertight design and has elevated pipes for intake and ventilation air.
It is thus possible to start the engine even if the boat is full of water.

For bailing purposes the flywheel casing is designed as a pump. If the boat fills with water, the
water enters the flywheel casing through the hole 1, fig 25 and is thrown out through the pipe
2 centrifugal force.

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