Furuno 851 MARK-2 - Manual (Page 11)

1. MOUNTING
1-5
4. Pass flat washers, spring washers and nuts onto hex bolts. Fasten by
tightening nuts. Do not fasten by tightening the hex bolts; seal washers may
be damaged.
Antenna
unit
Mounting
platform
Silicone
sealant
Flat washer
Rubber mat
Seal washer
Figure 1-7 How to fasten antenna unit to mounting platform
5. Coat flat washers, spring washers, nuts and exposed parts of bolts with
silicone sealant.
6. Prepare ground point in mounting platform (within 300 mm of ground terminal
on antenna unit) using M6 x 25 bolt, nut and flat washer.
7. Run the ground wire (RW-4747, 340 mm) between the ground terminal and
ground point.
8. Coat ground terminal and ground point with silicone sealant as shown in
Figure 1-8.
Ground
terminal
Hex bolt
Flat washer
Spring washer
Flat washer
Hex nut
Silicone
sealant
Hex nut
Weld here.
Silicone
sealant
Ground
wire
Antenna
unit
OR
Flat washer
Spring washer
Ground
wire
GROUND
TERMINAL
GROUND
POINT
Hex nut
Figure 1-8 How to coat ground point and ground terminal with silicone sealant