Not near it but it could be the culprit. The belt has sometimes run a little loose allowing it to rub against something nearby (I forget which) which released a ton of local belt dust before I replaced it and tightened it.
Plus the fan on the alternator housing could provide a positive pressure to force air out of the compartment. Now that the belt has been replaced and tightened properly, and the soot cleaned off of everything I could reach on the engine, the problem might be gone. It could be the source of the problem and it just landed mostly near the vent on top of the white fiberglass. This list never ceases to amaze! Thanks, Charlie Nelson cenel...@aol.com -----Original Message----- From: Martin DeYoung via CnC-List <cnc-list@cnc-list.com> To: cnc-list <cnc-list@cnc-list.com> Cc: Martin DeYoung <mdeyo...@deyoungmfg.com> Sent: Mon, Dec 28, 2015 6:34 pm Subject: Re: Stus-List Diesel ventilation Is the vent cover near the new engines fan/alternator belt? Calypso’s Perk 4-108 belts kick off a dust/soot like debris that gathers on the nearby sound insulation. Martin DeYoung Calypso 1971 C&C 43 Seattle From: CnC-List [mailto:cnc-list-boun...@cnc-list.com]On Behalf Of Charlie Nelson via CnC-List Sent: Monday, December 28, 2015 3:25 PM To: cnc-list@cnc-list.com Cc: cenel...@aol.com Subject: Stus-List Diesel ventilation I had my Yanmar 30GM replaced about 10 years ago with a Beta-28--it fit physically and was the proper power for my 36XL. The yard did a really good job of sound insulating the engine compartment with the plastic lined 1/2 inch foam--previously there was no insulation. A year or 2 later I replaced my AC unit and removed the ductwork which previously delivered air under the nav station for the main and forward cabins. I left the vent cover in place to cover the hole left behind when I ripped out the flexible ductwork. Since then, I have noticed a build-up of what looks like a layer of greasy soot on the fiberglass under the nav station. All the recent comments about diesel ventilation got me to thinking that maybe this soot is from the engine, which has the usual exhaust system. Further, I never smell exhaust down below but this soot returns after cleaning--not immediately but after a few months of light use, going out and in from the race course. The engine never seems starved for air and of course the bilge is open to the engine as are pathways via the aft cockpit lockers, etc. I can't see how sucking air in thru these vents would bring the oily soot with it. OTOH, I don't see how or why the engine would force engine room air out this vent. AFAIK, the air for combustion gets into the compartment from normal openings via the bilge and the aft lockers, none of which are close to air-tight. I have never noticed any air flow near this vent during operation--if there is any it is pretty light. Any thoughts on what might cause this? Charlie Nelson Water Phantom C&C 36 XL/kcb cenel...@aol.com _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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