Changing the direction of the propeller rotation, SP drives

The sterndrives are supplied adjusted for left hand rotation ‘A’. In some cases, however, it can be of advantage in a twin installation to have right hand rotating starboard propeller ‘B’. It’s possible, by a rather simple adjustment, to change from standard left hand rotating propeller to a right hand rotating one by simply moving the shift rod from ‘A’ to ‘B’. Check to make sure that the adjustment of the retaining pawl and the shift mechanism is still intact. Install the shift mechanism cover.

NOTE! There is no need to alter the direction of rotation on the Duoprop sterndrive in a twin installation.

On the propeller hub there is a ‘L’ for left hand rotating and a ‘R’ for right hand rotating propeller. Also the size of the propeller is stamped into the hub, for instance 15×19 where 15 denotes the diameter in inches and 19 the pitch, also in inches. This is not valid for Duoprop propellers.

The pitch is the theoretical lengthwise movement of the propeller during one full turn.

Adjustment of trim fin

The trim fin is factory set at 5° towards port side. After installation the adjustment of the trim fin should be checked and, if necessary, corrected according to figures below. This is a basic adjustment. An exact adjustment can only be done after a test run with the servo unit disconnected.

SP = Single prop

DP = Double prop

LH = Left hand

RH = Right hand

Twin engine installation

In a twin installation the ‘Toe-out’ angle between the sterndrives must be adjusted until an operation free from cavitation has been obtained. Increase the angle between the sterndrives on a boat with a deeper V-hull. Adjust the sterndrives in accordance with the picture. If the measurement at the transom shield is ‘A’, the measurement at the screw head of the trim tab must be ‘A’ minus 15–25 mm (9/16"–1").

NOTE! Push the sterndrives apart by hand when measuring.

NOTE! The figures show the boat drive from above. Tightening torque: 14–17 Nm (10–12 lbf.ft.).

Duoprop propellers are available in two versions as follows:

A-marked propellers shall only be used with diesel engines.

B-marked propellers shall only be used with petrol/ gasoline engines.

WARNING! A and B propellers must never be mixed.

Markings:

Earlier propellers are only marked on the side of the hub with the part No. and size code, from A1 to A10 or from B1 to B8.

On later propellers the part No. and propeller size marking on the side of the hub is complemented with the following data stamped on the rear end of the hub:

1 = Part No.

2 = Propeller size

3 = Date of vulcanizing

4 = Final manufacture date of the propeller

5 = Tool No. used for the vulcanizing

NOTE! that later propellers, both A and B propellers, are painted black. To identify the two types, the rear propeller has a sticker on the front end of the hub.

Propellers with a green/yellow sticker (A propellers) shall only be used with diesel engines.

Propellers with a red/yellow sticker (B propellers) shall only be used with petrol/gasoline engines.

Duoprop (later model)

Check which speed range the boat in question operates in, and select the correct propeller. Refer to propeller recommendations.

NOTE! The propellers are supplied in pairs and must not be mixed. Use special tool 885127. Install the propellers as follows: grease the propeller shaft and fit the fishing line protection (1) and the propeller (2).

WARNING! The line cutters (1 and 6) have very sharp edges. Be careful to avoid cuts. Then fit the plastic washer (3), the tab washer (4) and nut (5). Tighten the nut so that the locking washer’s tabs can be bent into the nut’s recesses. Thereafter, install the other fishing line protection (6) and the propeller (7). Place a plastic washer (8) on the nut (9) or propeller cone (10) and tighten the propeller with the nut. When the locking cone (10) is fitted, a spacer ring (11) shall be fitted for A-propellers. The spacer ring shall not be used for B-propellers. Place a washer (12) on bolt (13) and tighten the propeller shaft centre bolt.

NOTE! The line cutters (1 and 6) are now replaced by thrust washers. Never mount line cutters together with thrust washers.