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  1. #11
    Join Date
    May 2002
    Location
    Bristol UK
    Posts
    210

    Default Re: Yanmar 2 gm 20 f

    On a 1gm10 raw water cooled - when running normally I can put my hand on any part of the engine - inc the elbow. With a temp warning gauge that goes off @ 63 C - I doubt if the water needs to go into the exhaust at all - it could just go out on its own.
    I have been tempted to rig it up like that just to see what difference it makes to the elbow temp ?

  2. #12
    Join Date
    Aug 2004
    Location
    Cumbria; U.K.
    Posts
    2,784

    Default Re: Yanmar 2 gm 20 f

    Quote Originally Posted by nemodreams View Post
    On a 1gm10 raw water cooled - when running normally I can put my hand on any part of the engine - inc the elbow. With a temp warning gauge that goes off @ 63 C - I doubt if the water needs to go into the exhaust at all - it could just go out on its own.
    I have been tempted to rig it up like that just to see what difference it makes to the elbow temp ?
    I wouldn't recommend diverting the water flow as you appear to suggest. The metal elbow will get extremely hot from the exhaust gases, esp. with the engine under load, so you wouldn't want to touch it. The rubber exhaust pipe and any plastic water-lock etc will be damaged.

  3. #13
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    9,688

    Default Re: Yanmar 2 gm 20 f

    Quote Originally Posted by nemodreams View Post
    On a 1gm10 raw water cooled - when running normally I can put my hand on any part of the engine - inc the elbow. With a temp warning gauge that goes off @ 63 C - I doubt if the water needs to go into the exhaust at all - it could just go out on its own.
    I have been tempted to rig it up like that just to see what difference it makes to the elbow temp ?
    Quote Originally Posted by earlybird View Post
    I wouldn't recommend diverting the water flow as you appear to suggest. The metal elbow will get extremely hot from the exhaust gases, esp. with the engine under load, so you wouldn't want to touch it. The rubber exhaust pipe and any plastic water-lock etc will be damaged.
    But it's the water that's keeping the elbow cool enough to put your hand on it .... that's exactly what it's for.

    Earlybird is almost certainly right.

    You can have non-water cooled exhausts on boats but you need a different ducting system/silencer.

    Richard

  4. #14
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    19,136

    Default Re: Yanmar 2 gm 20 f

    Quote Originally Posted by nemodreams View Post
    On a 1gm10 raw water cooled - when running normally I can put my hand on any part of the engine - inc the elbow. With a temp warning gauge that goes off @ 63 C - I doubt if the water needs to go into the exhaust at all - it could just go out on its own.
    I have been tempted to rig it up like that just to see what difference it makes to the elbow temp ?
    I was forced to motor for no more than a couple of minutes without water when my water pump failed right in the middle of the entrance to Scheveningen harbour. The engine was OK but later inspection found the water trap appreciably melted.
    Answers to some technical queries at http://coxengineering.sharepoint.com

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