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Repower Tomcat 255
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thataway



Joined: 02 Nov 2003
Posts: 20778
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Wed Sep 12, 2018 3:31 pm    Post subject: Reply with quote

I would stick with your current engines; agree on reg oil analysis & reg DX by service providers
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Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
Photos: BrentB
PostPosted: Wed Sep 12, 2018 7:10 pm    Post subject: Reply with quote

Engines should last for several thousand hours

Oil can be analyzed on a regular basis

Have motors compression and leak down tested.

Buy a motor computer scan tool

Keep up with maintenance items


If offshore and have break down, do you have a good VHF radio setup, SSB radio or sat phone?

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Brent Barrett
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journey on



Joined: 03 Mar 2005
Posts: 3593
City/Region: Valley Centre
State or Province: CA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: journey on
Photos: Journey On
PostPosted: Wed Sep 12, 2018 11:57 pm    Post subject: Reply with quote

Well, you can consider those Suzuki motor breakdown as QA does. Theres a "bathtub curve", which predicts a high rate of failure at the beginning due to manufacturing faults, a low failure rate during the service life, and a high failure rate at the end of service life. This is a statistical method of looking at the problem, but I've found it to be true, even though you only have a sample of two. I know the Suzuki factory looks at the failure rate this way.

So it looks like those Suzuki motors made it past the manufacturing failure rate and are now operating with the low service failure rate. So, as I understand it, you're looking at replacing those motors when the failure rate is low, before any end of life failures occur. Remember, when you buy new motors, they will not be perfect and you may have to deal with failures, which of course are fixable under warranty. I think replacing those motors is not a good decision.

Journey On has a 2005 Honda 150 with ~1000 hrs on it. It has never let us down and appears to be in good shape mechanically. I have changed the oil and the various filters, put new zincs, new sparkplugs and performed routine maintenance. I expect that engine to last at least 2000 hrs with no trouble based on several reports, especially from the Avalon Harbor Patrol, which runs Hondas. I will paint it this year, since the motor sits pointing to the sun, which destroys the paint. This summer we put ~150 hrs, and it ran well.

Boris
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
Photos: BrentB
PostPosted: Thu Sep 13, 2018 2:26 pm    Post subject: Reply with quote

Boris


I enjoy reading your posts! Always very informative!
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joechiro30



Joined: 24 Sep 2014
Posts: 145
City/Region: Lynnwood
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
PostPosted: Tue Sep 18, 2018 7:54 pm    Post subject: Reply with quote

Thanks for everyones input. I am more confident to put more hours on these engines. I hope they can go another 2000 hrs.
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BTDT



Joined: 07 Jan 2011
Posts: 322
City/Region: Grand Lake Oklahoma
State or Province: OK
C-Dory Year: 2007
C-Dory Model: 255 Tomcat
Vessel Name: C- Lark Wine Down
Photos: C-Lark
PostPosted: Thu Sep 20, 2018 6:34 pm    Post subject: Reply with quote

My thoughts about 'high' outboard hour usage

With twin engines you can compare engine noise while running. If the sound changes between the two motors it may be an indicator of an issue. I'm at 2600 hours on my Honda 150's, and they still both 'purrrrr'


With twin engines I find myself using lower RPM's for the same cruising speed which should equate to increased engine longevity. With my single engine 26' cat boat I was averaging 4400 rpm for cruising. With my Tomcat and Honda 150's I'm averaging 3200 RPM for the same cruising speed. The lower RPM's could help the engines closer approach Honda car engines 250,000 mile service life.

Another thing to keep an eye on is fuel burn. At 2600 hours my engines are using identical fuel burn rates. When I see a difference I plan to have them both checked out

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John & Vicki Clark
C-Lark Wine Down
Tomcat 255
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