Sterndrive extensions

Tightening torques:

A-G-K = 33 Nm

B-F-M = 18 Nm

Installation instructions for 1" and 4" extensions:

Drain the oil from the sterndrive. Remove the cover over the shift mechanism. Remove the screws (and washers) holding the lower gear housing to the intermediate housing. Use a rubber mallet and carefully knock the housing apart. Remove the splines sleeve.

NOTE! When installing a 1" extension the washers will be used again and on the 4" extension the screws as well as the washers.

Use special tool 884982 in combination with special tool 884316 to remove the outer bearing race of the axial bearing from the intermediate housing.

Clean the contact surfaces of the housing carefully. Check the O-ring and replace it if necessary.

Press in the outer bearing race of the axial bearing in the extension. See under Shimming the intermediate housing and the lower gear housing.

NOTE! Measure the measurement ‘B’ on the extension!

The 4" extension

Coat the contact surface with a sealant, Volvo Penta part no. 1141570-0. Use the 3 new O-rings and the oil pipe from the extension kit. Install the extension on the lower gear housing. Tighten the bolts ‘A’ and ‘B’ in diagonal sequence. Tightening torques – see the picture!

NOTE! Use washers ‘C’ underneath the 4 larger screws. Then install the existing splines sleeve on the lower vertical shaft and then the extension shaft and the new splines sleeve.

The 1" extension

Coat the contact surfaces with a sealant. Use the 3 new O-rings and the oil pipe from the extension kit. Install the extension on the lower gear housing.

Install the locking ring in the splines sleeve. Turn the end with locking ring downwards and then install the sleeve on the lower vertical shaft.

Install the stud screws ‘D’ in the intermediate housing ‘E’.

Coat the contact surfaces with a sealant and place the intermediate housing on the extension.

NOTE! Do not forget the O-rings! Tighten the bolts ‘F’ and nuts ‘G’ (1" extension) evenly and in diagonal sequence. Use the existing washers ‘H’ on the nuts. On the 4" extension the screws ‘K’ and the washers ‘L’ are used instead of nuts and washers.

Tightening torques – see the picture!

Install the cover over the shift mechanism.

If the paint has been damaged, use touch-up paint to repair. See under Accessories–Aquamatic Fill up with lubrication oil. Regarding oil quantity and oil quality, see chapter Technical Data. Check the oil level with the sterndrive fully lowered. Let a few minutes pass after you have shut down the engine before you start checking the oil level. Push down the oil dipstick as far as possible, however, without tightening it. Lift up the oil dipstick and register the oil level. Top-up if necessary.

NOTE! Do not forget the small O-ring underneath the oil dipstick head.