Northern Lights M864 — Soundshield Assembly and Installation
Installation · M864W3 soundshield enclosure
For the Northern Lights M864, from the Northern Lights service manual.
Applies to: Northern Lights M864
Before you start
- Backflow of water into the engine from wet exhaust installed near or below the waterline can ruin the engine and possibly sink the vessel if a siphon break is not used
Procedure
- Inspect all components for damage and check the packing list before assembly
- Select mounting location per IM1000 Installation Manual on a rigid, flat surface above a strong structure such as the vessel's stringers
- Install toe brackets to all four corners using machine screws, flat washers, and nylock nuts; engage firmly but do not fully tighten
- Install vertical corner extrusions to toe brackets using short bolting assemblies; tighten just enough to check movement
- Slide long bolting assemblies and nylon panel keeper blocks into the forward vertical extrusions
- Mount the side vertical center posts to the sub-base using machine screws, flat washers, and nylock nuts
- Raise and position the pre-assembled top frame over the four vertical extrusions and anchor the center bar connector brackets
- Install the rear panel assembly, engaging the retainer clips and rear panel gasket, then secure the bottom with capscrews and flat washers
- Install the stainless steel wet exhaust tube between the generator's exhaust elbow and the rear panel grommet; install four hose clamps
- Connect exhaust, sea water, fuel, DC control harness, battery, and AC output leads through the rear panel holes
- If required, install a siphon break at the penetration plate for wet exhaust near or below the vessel's waterline
- Start the generator set and run under load to check for leaks of fuel, water, or exhaust gas
- Install the remaining cover panels, adjusting for approximately 0.09 in clearance around the panel perimeter
- Insert foam blocks into the base pan mounting foot pockets and adhere in place
Tools required
- extra long Phillips screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum 4 in (102 mm) clearance between shield's intake and outlet grilles and any bulkhead
- Minimum 4 in overhead clearance
- Siphon break mounted a minimum of 12 in above the vessel's loaded waterline
- Fuel connections 1/4" NPT
Full service-parts list: Northern Lights M864 →
Source: Northern Lights service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.