BOLT ON INSTALLATION
2a.
Once the place for the installation has been decided, hold the tunnel in place in the horizontal position and
mark the bolt holes. Remove the tunnel and it is then possible to calculate and mark the centre (see Fig. 1).
3a.
It is important that the tunnel flange sits flush on the transom. If this is not case, then the fitting area on the
transom will have to be worked to ensure a snug fit.
PS ! Take care with grinders as it is very easy to remove to much fibreglass
At this time, cut out the centre hole and the transom to the same internal diameter as the tunnel flange and
drill the bolt holes. Before actual fitting the stern tunnel, we recommend that the prepared area is sealed with
a gelcoat or similar to ensure there is no water ingress.
4a.
Before fitting the tunnel to the transom, install the gear leg to the tunnel as described in the thruster installation
manual. We recommend that you fit the oil feed pipe also before the tunnel is bolted to the transom.
Special installation points described on page 7 of this manual.
5a.
When fitting the tunnel, ensure that there is ample sealant (Sikaflex or similar) in the sealing tracks of the
tunnel flange and around the bolts to make a water tight fitting (see FIG. 2&3).
Bolts, washers and nuts are not included as they will vary depending on the transom thickness. We
recommend A4 stainless with A4 lock nuts and A4 washers of a large diameter on both outside and inside.
Bolts diameter (stainless steel):
ø 6mm or 1/4” for SP 30 Si & SP 40 Si
ø 10mm or 3/8” for SP 55 Si & SP 75 Ti & SP 95 Ti & SP 125Ti & SP 155 TCi
ø 12mm or 1/2” for SP200TCi & SP 240 TCi & SP 285 TCi
6a.
The electromotor must have a solid support so that the weight
can not cause a twisting action on the tunnel (see FIG. 4).
7a.
Refer to the installation manual for the recommended thruster fitting.
Stern thruster installation manual
Version 1.6 - 2005
Motor support
MUST be
installed
FIG. 4
FIG. 3
SEALANT
WASHERS
LOCKNUT
OR DOUBLE
NUTS
3
FIG. 2
SEALANT
