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Drivetrain rattling and shaking |
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TRIP 
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Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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 Topic: Drivetrain rattling and shakingPosted: July-10-2018 at 1:24am |
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Hi guys,
last couple times out has this issue: boat starts and runs fine. After 20 minutes or so of riding the engine starts lacking some power when pulling a rider out of the water. Takes a few seconds, and then all horses are back, and then runs fine at speed. When changing riders though, having the engine turned off for a few minutes: engine starts just fine, but when putting in forward the whole engine/transmission/not sure what starts shaking and rattling. Not pretty. With a bit more gas it disappears, when accelerating same thing as before, some lack of power for a bit but then fine when riding. I checked V-drive and transmission fluid and filled up V-drive a bit, but still same problem. I'll check 'm again though, to be sure. Any ideas? Spark plugs are new. Next step plug wires and cap/rotor? Other suggestions? Thanks! Oh yeah: '97 Super Sport/GT40. |
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2001SAN
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Joined: June-26-2012 Location: Ireland Status: Offline Points: 242 |
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Posted: July-10-2018 at 7:31am |
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I had a similar issue at the start of this year. Sudden rough,and I mean rough, running and major shaking. A new cap a rotor solved the problem. Old cap and rotor were a few years old and corrosion had built up over time.
D. |
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A little knowledge is a dangerous thing...
2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk |
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TRIP
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Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Posted: July-10-2018 at 11:51am |
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OK I'll be ordering those. Even if it doesn't solve it, good items to have.
Thanks for chiming in! |
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sport1999
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Joined: May-10-2015 Location: Florida Status: Offline Points: 313 |
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Posted: July-10-2018 at 12:40pm |
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Couldn't be an issue with the cracked tube inside the FCC? Have you verified fuel pressure at idle and under load?
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TRIP
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Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Posted: July-10-2018 at 12:45pm |
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No I haven't, I'll put it on the to-check list.
Thanks very much! |
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TRIP
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Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Posted: July-14-2018 at 12:02am |
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Took boat out two more times.
First day: after leaving the dock, engine died and was bit hard to start again. Ran a bit rough in the beginning, then fine, but idled pretty high at almost 2000rpm. When I was done with the clients I shut the motor off. Started again a bit later and idled fine too. 2nd day: Boat ran fine, idle normal, only suddenly died several times when idling but started right up every time. No other issues. Sound familiar to anyone? Any other ideas? |
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sport1999
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Joined: May-10-2015 Location: Florida Status: Offline Points: 313 |
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Posted: July-24-2018 at 10:18am |
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Any progress?
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TRIP
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Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Posted: July-24-2018 at 2:05pm |
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Nope, on vacation now. Will have new cap and rotor when I get back. Still have a new set of cables.
Doing clinics with David O'Caoimh about 2 weeks after I get back so I hope changing these items help. Though boat (still) runs good 99% of the time so it's not super urgent. Yet. |
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sport1999
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Joined: May-10-2015 Location: Florida Status: Offline Points: 313 |
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Posted: July-24-2018 at 2:19pm |
Sounds good and good luck. I follow David's social media channels. His content is pretty original and fun to watch. Make sure to post a few pictures. |
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TRIP
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Joined: December-08-2007 Location: Costa Rica Status: Offline Points: 629 |
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Posted: October-22-2018 at 1:15pm |
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Boat hasn't shaken and rattled since cap and rotor were changed :)
Occasionally still get high revs after stopping the boat/fallen rider. Though that hasn't happened last 3 or 4 times out. Odd... Question: spark plug cables that I have laying around were for my previous boat ("85 2001 with 351). Do they work for the GT40? Dave's visit was awesome by the way! Sick rider obviously, but also a genuinely super nice guy. But I'll make a separate post about that and link it here. |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 10646 |
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Posted: October-24-2018 at 11:00am |
Your GT40 has male terminals on the distributor cap and your 85, if it was the stock Prestolite distributor had female terminals so the answer would be no they won't fit. Just grab a cable and try it to verify that they don't fit |
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TRIP wrote: