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Part IX Extending the outboard drive unit
Extending the outboard drive unit
General
When installing the Aquamatic unit in boats with a
deep V-bottom, it can happen that the engine lies
rather deep in relation to the water level when the boat
is loaded.
As a maximum limit to the depth to which the engine
and the drive may be installed, the following applies:
When the boat is loaded, the water level may not be
higher than to the lower edge of the rubber pad on the
upper edge of the mounting collar.
By fitting an extension on the drive unit, the engine
can be mounted higher up on the transom.
The S-measurement (AQ250), which is given in “Tran-
som Template”, Publ. No. 7718893, should be in-
creased by the same height measurement as that of
the extension used.
The following are the extensions available:
For the Aquamatic 250 drive unit:
25 mm (1") Part No. 814133
100 mm (4")Part No. 814318
200 mm (8")Part No. 897830
NOTE: 8" extension may only be used after consulta-
tion with AB Volvo Penta
Installation instructions for AQ250 drive
unit
1. Drain the oil from the outboard drive unit. See Part
II, point 3.
2. Remove the protection casing from the gear mech-
anism, likewise the control (shift) rod and the bolts
and nuts securing the upper gear housing to the inter-
mediate housing. With a rubber mallet tap carefully on
the housings until they can be separated.
NOTE! Keep a count of the number of shims between
the housings.
3. Unscrew the bolts securing the lower gear housing
to the intermediate housing. With a rubber mallet tap
carefully on the housings until they can be separated.
Lift off the splined sleeve.
4. Remove the outer bearing race for the thrust bear-
ing from the intermediate housing. Use tools 884140
and 884143.
5. Clean the contact surfaces of the various houses
thoroughly. Check the O-rings and replace them if
necessary.
6. Press the outer bearing race for the thrust bearing
into the extension.
7. Fit the extension on the lower gear housing. Smear
the contact surfaces with VP sealing compound
1141570-0. Use three new O-rings and the oil pipe in-
cluded in the extension set. Tighten the bolts evenly
and in diagonally opposite sequence.
8. Fit the lock ring in position in the splined sleeve.
Turn (for 1" and 4" extension) the end with the lock
ring downwards and then fit the sleeve on the lower
vertical shaft and, for the 8" extension, install the in-
termediate shaft.
9. Place the intermediate housing on the extension.
Smear the contact surfaces with VP sealing com-
pound 1141570-0.
NOTE: Do not forget the O-rings. Tighten the bolts
evenly and in diagonally opposite sequence.
10. Fit the upper splined sleeve. Mount the upper gear
housing with O-ring on the intermediate housing after
having first coated the contact surfaces with VP seal-
ing compound 1141570-0. Tighten the bolts and nuts
evenly and in diagonally opposite sequence.
NOTE: Do not forget the shims between the housings.
11. Install the control (shift) rod and the protection
casing.
12. Touch up any damaged paintwork with genuine
Volvo Penta touching-up paint.
13. Fill the lubricating system with oil. Concerning oil
capacity and grade, see Part X “Specifications”.
Check the oil level by pushing the oil dipstick down as
far as it can go, but do not screw it down. Withdraw
the dipstick and note the level. If necessary, top up
with more oil.
NOTE: Do not forget the small seal under the dipstick
head.
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