Volvo Penta — Building the engine bed (Inboard)
Installation
From a Volvo Penta service manual — check it applies to your exact model before use.
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Before you start
- Do not use the elasticity of the rubber mountings to compensate for an inclined bed.
Procedure
- Align the hull horizontally so calculated water lines are parallel with the horizontal plane.
- Build up the engine bed with spacer material so the underside of the engine mountings almost rests against the bed.
- Build in a galvanized flat bar 10–12 mm thick, min length 250 mm and min width 80 mm.
- Build in drain channels to allow water to drain to the bilge pump.
- Make sure the space for the flywheel housing and sump has a clearance of at least 20 mm.
- Fill the engine bed with high density material to reduce noise and vibration.
- Align the engine with the propeller shaft and mark up the engine mounting holes.
- Drill and tap holes in the bed and flat bars.
Specs & values
- Recommended bolt diameter D4/D6 flexible mountings: M12 or 1/2" UNC
- Engine bed min. width: 112 mm (4.4")
Source: Volvo Penta 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.