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I found it very awkward to reach the fan belt and raw water pump at the front of our N33 with a Lehman 90hp motor. So I DID cut a hole through the bulkhead from the saloon (beneath part of the saloon seat) into the engine-room.
It was tough to cut through (I used a miniature angle-grinder) as there’s a layer of steel and packing soundproofing between the two (engine compartment and saloon). I asked the local boat-builder to put a matching set of beading around the square of panelling which I’d cut through, so that when it’s back in place it perfectly matches its surroundings ..sorry, I don’t have a picture at hand to post here ..I’ll add one in the next few days.
This makes it really easy to (a) reach the fan belts and alternator for adjustment, (b) reach beneath the motor to get to the raw water pump, (c) get to the flywheel, as I intended to add a laser-LED rev counter to our fuel-meter display.
The teeny hatchway through from the saloon to the fan belt is a GREAT improvement, and makes access so easy! (I snapped a tendon to my little finger when trying to remove the raw water seal originally, before this easy access hatch was fitted!)