Northern Lights M753, M773L User Manual

M753 / M773L

Soundshield Assembly Instructions

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L613 02/05

M753K/M773LK Soundshield

ITEM # DESCRIPTION ADE P/N QTY NOTES

1. Base board 05-78609 1

2. Extrusion, vertical 05-78611 4

3. Extrusion, horizontal, sides 05-78612 2

4. Extrusion, horizontal, ends 05-78613 2

5. Corner casting 05-70001 4

6. Bolting assembly 00-75714 20

7. Rear panel assembly 05-78606 1

8. Front panel assembly 05-78603 1

9. LH side panel assembly 05-78607 1 w/vent box

10. RH side panel assembly 05-78604 1 no vent box

11. Top panel assembly 05-78602 1

12. Penetration panel assembly 39-78008 1

13. Panel retainer bracket, 30R 23-70036 6

14. #10 screw s/s x 5/8” long 12-72002 8

15. Toe bracket, 30R 23-70038 4

16. Hex nut, nylock 1/4-20 14-00112 6

17. 1” 90 Degree Elbow 21-22002 1

Specifications

Enclosure:

Length (OA) 38.82 in (986 mm)

Width 25.16 in (639 mm)

Height 24.60 in (624 mm)

Base:

Length 39.32 in (998.7 mm)

Width 25.66 in (652 mm)

Height 0.75 in (19.05 mm)

Assembled Height:

25.32 in (643 mm)

Assembled Weight (est):

92.5 lbs (42.0 kg)

L613 02/05

1

1

Prior to assembly, inspect all components for damage. Report any damage to the
shipping company. Check the packing list to be sure all parts are included.

2

3

Select a mounting location in accordance with the guidelines in the IM1000 Instal­lation Manual (supplied with the generator set). The generator set must typically be
mounted on a rigid, flat surface above a strong structure, such as the vessel’s string­ers, to minimize vibration transference to the hull. CAUTION: THE BASEBOARD

IS A NON-STRUCTURAL MATERIAL AND MUST BE FULLY SUPPORTED TO
MINIMIZE FLEX.

Note that the generator set is designed for single side service. When viewed from

Install the base board (item 1) in the vessel in as near a level attitude as possible.
Observe the arrow symbol on the board’s topside surface. This indicates the top and
forward end orientation of the genset / soundshield. Make sure arrow is correctly
positioned or the unit will not mount correctly within the shield.

4

Install toe bracket (item 15) to each corner of the base board with screws (item 14)
into pre-drilled holes. See figure 1.

Note that there are pre-drilled “through” holes on each side of the baseboard. Use
these holes as guides to drill into the supporting substructure for through-bolting.

Snorkel hose
on M773LK

Place the generator set onto the baseboard, lining up the thru-holes with the mount­ing holes in the genset base frame. Use 3/8” or 9 mm bolts of appropriate length to
secure the genset and baseboard to the underlying structure.

2

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5

Install the four vertical corner extrusions (item 2) with eight bolting assemblies (item

6) per figures 1A and 1B. Leave hexnuts finger tight.

Figure 1: Typical corner, top view.

Figure 1A: Toe bracket shown with vertical

extrusion installed.

Figure 1B: Note how the square head of the
T-bolt goes inside the extrusion recess.

L613 02/05

3

6

Note the available leg on each cast corner (item 5) of the pre-assembled enclosure
top (items 3, 4, 5, 6, 11, 12, 13 & 16). Loosely install a bolting assembly (item 6) to
each of these legs. See Figure 2.

Figure 2: Internal view of corner casting, part
of
the pre-assembled top enclosure frame as-

4

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Orient top with triangular shaped penetration plate (item 12) toward front of genset
and unattached corner legs facing down. Install each leg into the top of vertical
extrusion. See Figure 3.You may wish to temporarily remove the top panel (item 11)
and set it aside to improve access to the bolting
assemblies and for step 8. Check frame for squareness and tighten all connections.

Figure 3: Note how the bolting assembly fits
inside
the vertical extrusion. Only finger tighten until

8

Mount the rear panel assembly (item 7) to the rear of the enclosure frame. Ensure
that the panel is properly fitted into the back of the frame, with the panel surface to
extrusion being flush. Rotate panel retainer brackets (item 13) until they are directly
on top of the extrusion flange. Tighten nylock nuts so the retainer effectively clamps
the panel against the extrusion flange. Caution: do not overtighten retainer clip

nuts, as seal damage could occur.

Note the engine’s pre-existing intake snorkel tube; it’s the long black preformed hose
with one end attached to the intake cover plate and the inlet (open) end secured by
a clamp to the generator mounting foot bracket. (Continued on next page)

L613 02/05

5

(Step 8 Contin-

9

Remove the clamp holding the intake hose and discard. Insert the copper 90-degree
elbow into open end of hose.

Firmly push the other end of the elbow into the hole located on the lower side of the
sound shield rear inlet box. Ensure the elbow is fully inserted. We recommend a lu­bricant be used when inserting copper elbow into grommet at inlet duct. No changes

Install connections for exhaust, fuel, AC power leads, DC control panel leads, bat­tery, and water through holes in the rear panel as shown in the drawing (Figure 4)
and as described below:

a. Connect the exhaust elbow of the diesel engine to the exhaust system of
the vessel.
Pass the two inch exhaust hose through the opening provided in the left
mid-section
of the rear panel.

b. Connect the sea water pump to the vessel’s water inlet. Pass a 3/4” hose
from the vessel’s
sea water strainer, through the lower hole at the bottom left of the rear
panel to the sea
water pump inlet fitting.

c. Connect the vessel’s fuel supply, and fuel return to the generator set using
Coast Guard
approved rubber fuel hoses. Pass these lines through the slot provided at
the bottom
right of the rear panel and attach them to the generator set’s 1/4” hose
barb fittings.

6

Figure 4: Facing the rear panel.

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Note the pre-installed penetration plate (item 12) in the forward right corner of the
enclosure frame top. Reference the plumbing diagram in the mounting and exhaust
sections of the IM1000 installation manual.

11

CAUTION: GENERATOR SETS WITH WET EXHAUST THAT ARE INSTALLED
NEAR OR BELOW THE VESSEL’S WATER LINE MUST USE A SIPHON BREAK
TO PREVENT BACKFLOW OF WATER INTO THE ENGINE. THIS BACKFLOW
CAN RUIN AN ENGINE AND, POSSIBLY, SINK THE VESSEL. The penetration

a. Disconnect the hose from the seawater pump output and from the rubber
elbow on the
expansion tank. Install two lengths of 3/4” hose. The hoses must be of
adequate length
to allow mounting of a siphon break a minimum of 12 inches above the
vessel’s loaded
water line.

b. Pass the seawater pump output hose through the hole in the penetration
plate closest
to the front of the shield. The hose from the expansion tank must go
through the hole in

12

Start the generator set and run under load to check for leaks of fuel, water, or ex-

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13

Install cover panels as shown above.

As you install the panels, observe that there should be a minimum clearance of ap­proximately 1/32” around the panel perimeter (except at the bottom of the side pan­els). You may adjust for this by loosening any number of corner bolting assemblies
or toe brackets until fit is satisfactory. Tighten all connections when done.

Although preset at the factory, one or more panel latches may occasionally need
adjustment. Using a 1/4” box-end wrench, rotate latch striking bolt one-half turn;
counter clockwise to tighten panel, clockwise to loosen panel.

8

L613 02/05

L613 02/05

M753K/M773LK Soundshield Packing List

ITEM # DESCRIPTION ADE P/N QTY NOTES PACKED

1 Base board 05-78609 1 assembled

2 Extrusion, vertical 05-78611 4 loose

7 Rear panel assembly 05-78606 1 assembled

13 Panel retainer bracket, 30R 23-70036 4 installed

16 Hex nut, nylock 1/4-20 14-00112 4 installed

Enclosure top, assembled. 1

Consists of the following parts:

3 Extrusion, horizontal, sides 05-78612 2 assembled –

4 Extrusion, horizontal, ends 05-78613 2 assembled –

5 Corner casting 05-70001 4 assembled –

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6 Bolting assembly 00-75714 8 installed –

12 Penetration panel assembly 39-78008 1 installed –

13 Panel retainer bracket, 30R 23-70036 2 installed –

16 Hex nut, nylock 1/4-20 14-00112 4 installed –

11 Top panel assembly 05-78602 1 assembled –

8 Front panel assembly 05-78603 1 assembled

9 LH side panel assembly 05-78607 1 assembled

10 RH side panel assembly 05-78604 1 assembled

6 Bolting assembly 00-75714 12 loose (bagged)

15 Toe bracket, 30R 23-70038 4 loose (bagged)

14 #10 screw s/s x 5/8” long 12-72002 8 loose (bagged)

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17 90° Elbow 1 x 1 21-22002 1 loose

Packed By : Date :

L613 02/05

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