1976 Irwin 37 cc with exhaust issues. - SailNet Community

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Old 08-02-2007
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Unhappy 1976 Irwin 37 cc with exhaust issues.

My Perkins 4-108 engine manifold is on the port side. The anti-syphon loop is dry andcrosses over the transmission to starboard, befor water cooling is supplied on the downflow to the perolating muffler. The muffler discharge crosses back over the transmission to port goes below the hall floor forward to midship and then up to discharge midship on the port side at the water line.

This creates a lot of heat in the engine compartment because cooling doesn't take place immediately after the manifold, and also creates a wet loop after the muffler creating a fair bit of back-pressure. It is difficult to get at the exhaust thru-hull which has no sea **** as access is limited by a small hatch near the aft end of the port setee and to port of the DC electrical distribution panel. Servicing an exhaust hose leak in this area will be next to impossible in an emergency.

Was this the original exhaust configuration for the boat? Piping seems to have been altered in the engine compartment, and I can't tell if this was an attempt to improve the situation, or somebody's attempt at a repair?

I've thought of taking the exhaust to the stern, but this makes for an equally long run with a wet loop aft of the muffler. Discharging at midship on the starboard side at watter line to avoid all the cross-overs may also be problematic, as I have yet to figure out how to make it past the galley or aft washroom.

Discharging near the engine compartment will result in a thru-hull about 2' below water.

Has anyone with a similar boat tackled this issue, or have any thoughts on the matter? Replies welcome.
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Old 08-03-2007
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Sounds like a PO royally screwed the setup on the exhaust. Photos with a bit of a diagram of what goes where would help a lot... and then, maybe we can give you a bit more applicable advice.

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