Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 03-08-2011, 16:47   #46
Registered User
sabray's Avatar

Join Date: Aug 2008
Location: Wash DC
Posts: 3,169
Originally Posted by Capn Morgan
Hi Sandy

I do no know enough to talk about the external filter sizes. Mine are 2 micron because I want them to stop anything before it gets to the engine mounted filter. The Racor ones are much cheaper and easier to replace than the Yanmar ones.

As for the soot, I agree with the post above in that I think it is old carbon deposits in your exhaust system that will either clear up in time with use or you are going to open it and do it yourself.

Either way, good to read your follow up, keep sharing the fun!


Me too first filter is a big honking 1000 series racor with 2 micron filter. I keep a few spares. Never have seen them gunned up though.

sabray is offline   Reply With Quote
Old 04-08-2011, 05:59   #47
Registered User

Join Date: Dec 2008
Location: ontario canada
Boat: grampian 26
Posts: 1,743
Re: Black Exhaust Water - Soot ?

With regards to prop pitch think of it in terms of a manual transmission. Over pitched is equivalent to driving up hill in high gear. You will be lugging the engine and eventually kill it. Under pitched = low gear you will be over revving and will eventually kill the engine.

perchance is offline   Reply With Quote
Old 14-10-2013, 02:16   #48
Registered User
Tide Roller's Avatar

Join Date: Feb 2013
Location: Honolulu, HI
Boat: Catalina 36
Posts: 29
So I realize that the last post for this thread was a few years ago but I am having a similar issue with my universal m25xp. Can not get above 2000RPM in gear and above 1500RPM gives the black soot with smoke. Cleaned the air filter, exhaust riser was rebuilt and I cleaned the mixing areas where exhaust meets water. There has been 75 gal of fuel run through at high RPM with not much else than a dirty transom. The filters have been changed a couple times and no help.

Manual says low compression, overload or propeller
I am thinking about compression testing the engine, but this thread has a lot of info about over pitching. The prop for all I know is original and hasn't given any issues before but I have about 1yr experience with this boat. (83 Catalina 36).

Would excessive prop-walk in reverse indicate it is over pitched? It's almost as if I can't back up straight at all. Even when the rudder is hard over to the opposite direction. Over pitched?

Sandy or anyone, if you can give me a solution that worked I would greatly appreciate it.
Tide Roller is offline   Reply With Quote
Old 14-10-2013, 02:53   #49
Registered User
atoll's Avatar

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,signet20,prout snowgoose 37 elite catamaran!
Posts: 8,640
Images: 75
Re: Black Exhaust Water - Soot ?

have you cleaned the prop?
is the hull dirty?
a few barnacles can make a Big difference

latest project
atoll is offline   Reply With Quote

exhaust, water

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
1GM-10 Black Sooty Exhaust Wunu Engines and Propulsion Systems 4 25-04-2011 14:43
Copper Wet Exhaust Soot Cleaning? Oatman Construction, Maintenance & Refit 6 28-02-2010 14:11
Black water from 2gm exhaust Aquah0lic Engines and Propulsion Systems 31 16-01-2009 13:35
Yanmar issues... white smoke and black oily soot (exhaust) and engine smoke CS27 Engines and Propulsion Systems 3 14-09-2008 17:40
This Can't Be Good.... Black Smoke & Soot markpj23 Engines and Propulsion Systems 17 04-06-2006 06:35

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:27.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.