Boat ran great until went to go shark fishing today, couldn't get above 2000 rpm, changed fuel filters no difference. Anyone ha e any suggestions what to look for next
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Thread: 671tib lost rpms
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06-15-2019 10:50 PM #1Senior Member
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671tib lost rpms
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06-16-2019 07:15 AM #3Senior Member
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Re: 671tib lost rpms
Bottom was done maybe 6 weeks ago boat ran great last week for offshore tuna fishing
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Re: 671tib lost rpms
Depending on where you’re located, warming water temperatures and condition of paint, six weeks can be a long time. How about growth on the props? Dirty props can be 80% of the drag on my boat, for ey. I think you have to eliminate the bottom if nothing sticks out on motors.
Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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Re: 671tib lost rpms
Both engines or just one? Both sounds like the bottom, growth on the wheels, or a combination. One could be a fuel issue or something wrapped around a shaft, perhaps.
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Re: 671tib lost rpms
After the filters (secondaries too?) I d check the wheels. Doesn’t take much barnacle growth to affect performance. Don’t know where you are but down here on FL 6 weeks will do it. Usually something wrapped on a prop would cause a vibration but not always
Any smoke on start up, underway? Any sheen on the water ?
Doesn’t have to be both engines. One weak engines could prevent the other from reaching full RPMPascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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06-16-2019 09:38 AM #7Senior Member
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Re: 671tib lost rpms
In New York, no smoke, props were reconded while bottom was done. Will do the secondaries and hopefully just picked up some Crap in fuel and that fixes it
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Re: 671tib lost rpms
How old are the secondaries? I replace both primaries and secondaries at every oil change, mains and gens
Take a look at props any way... if in reasonably clear but cold water you can attach a GoPro to a boat hook and take a lookPascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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06-16-2019 11:01 AM #9
Re: 671tib lost rpms
I would also check your air filters and turbos... turbo should spin very freely when you give it a whirl and continue spinning for a few seconds....
One other VERY remote possibility... but would take a very easy check... make sure the emergency air flapper shutdown is not inadvertently closed...Last edited by JD5652; 06-16-2019 at 11:03 AM.
JD
1976 58' LRC Hull #311
"Miss Maggie"
Riviera Dunes, FL
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06-16-2019 11:15 AM #10Senior Member
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Re: 671tib lost rpms
Secondaries were changed last year. I’ll change them again and clean air filters just in case