Just surveyed a 49 Gulfstar with 671 TA engines that started from cold immediately with very little smoke for about 5 seconds. As soon as we started running up the RPM’s they started smoking very black smoke at about 1500 and it did not clear up at all. Supposedly all 4 turbos were just serviced, what ever that means. The owner never ran them over 1200 for 4 years. You guys always have great ideas in this area, what do you think? John
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Thread: 671 TA smoke
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671 TA smoke
Mahalo V
1974 53 Motoryacht
Hull Number 406
San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.
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Re: 671 TA smoke
Smoke at RPM (black) could be lack of air. Turbos, clogged after cooler?
Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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02-02-2019 02:14 PM #3
Re: 671 TA smoke
Get a good engine survey.
It's not a good idea to armchair survey engines. It may be simple but it also may be a big cost item.
You already determined their not running right.Scott
41C117 "Hattatude"
Port Canaveral Florida.
Marine Electronics and Electrical Products Distributor.
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02-02-2019 02:24 PM #4Registered Member
- Join Date
- Jun 2012
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- 14
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02-02-2019 02:56 PM #5Senior Member
- Join Date
- Apr 2008
- Posts
- 494
Re: 671 TA smoke
Need a bit more info. Did the engines ever reach rated WOT rpm during the seatrial? Did both engines exhibit the same behavior at the same RPMs?
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Re: 671 TA smoke
Kelpy, no and yes did not hit WOT and yes both engines
Mahalo V
1974 53 Motoryacht
Hull Number 406
San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.
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02-02-2019 08:40 PM #7Senior Member
- Join Date
- Apr 2008
- Posts
- 494
Re: 671 TA smoke
1500 RPM is about where the turbos start to make boost.
If this was my problem, I would -
1. Assure that the bottom and running gear are clean.
2. Run a scope down the air side of the aftercoolers to see if they are plugged up.
3. Check the propeller size. Some people think that putting oversize props on the boat helps improve fuel economy at displacement speed/RPM. It doesn't work out that way.Last edited by kelpy; 02-02-2019 at 08:48 PM.