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Boat will not plane

GAS engine, transmission and generator repair and maintenance discussion forum.
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United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 1920
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 39 times
Been thanked: 278 times

Re: Boat will not plane

Postby waybomb » October 9th, 2013, 11:03 pm

Hook up a vacuum gage. Post results for both engines at idle. Describe any needle movement.
Disconnect the throttle linkage. Actuate the throttle quickly to wide open and let off just as quick, while intensely watching the vacuum gage. Does it go to zero vacuum? Did it get there smoothly? On the way back to idle, what exactly did the needle do?

What brand engines-Mercruiser, crusader, something else?

Did they time the engines? Are you comfortable with turning the distributor?
What ignition system do you have? Points? Do you have a dwell meter
and know how to use it, and adjust the points?

Vacuum gage can tell us all about the intake and exhaust cycles. W need to adjust the dwell if a points system, and then check timing.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft

User avatar

United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 1920
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 39 times
Been thanked: 278 times

Re: Boat will not plane

Postby waybomb » October 10th, 2013, 2:00 pm

Let's look at something simple as well.

With the engines and everything turned off, not running.
Go to the bridge and open the throttle all the way.
Go down to the carburetors.
Pull the flame arrestors off.
Manually open the choke and secondary air butterflies
Look down the carburetor - the throttle butterflies should be perfectly vertical.
If not, find the linkage adjusters on the throttle cables at the carburetor, and adjust until the butterflies are 100% open.
Then go to the bridge, close the throttles, go back down and make sure the throttle butterflies are closed, and the carburetor's throttle linkage is up against its stop.


If the throttles were not all the way open and you had to adjust, go take it out for a ride and see how it performs.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft
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nolacarver
Scurvy Dog
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Posts: 19
Joined: October 6th, 2013, 6:49 pm
Vessel Info: 1979 33' carver
New Orleans, LA

Re: Boat will not plane

Postby nolacarver » October 10th, 2013, 9:22 pm

Thanks for the suggestions Fred, i will try them over the weekend and post the results.
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Ramsport47
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Vessel Info: 1998 Carver 310 Santego
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Re: Boat will not plane

Postby Ramsport47 » November 16th, 2013, 11:22 am

Any update on the performance issue?
Kenny
1998 Carver 310 Santego
T-Merc 350 Mag MPI (300hp)
Port: Cedar Point Marina, Sandusky, Ohio
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United States of America
Seif911
Captain
Captain
Posts: 233
Joined: April 11th, 2013, 6:46 am
Vessel Info: 1977 Carver Mariner 33'
Location: Sheboygan, WI
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Re: Boat will not plane

Postby Seif911 » November 17th, 2013, 7:44 am

Hmmm...so the point you have your boat at now is similar to mine. It sounds like your starboard engine is good and now you need to fix the port. Why did they not rebuild the port carb? That is what I am planning before my boat hits the water next year, rebuild both carbs. I also have 1 engine at 3200 and 1 at 3600. I might even have the same engines :). I also will be epoxing the plugs as Fred suggested. I believe I am leaking through the plugs since it takes a little to start (empty fuel bowl?) but idles perfect.

Good luck and keep us up to date.
Thanks,
Steve

22' Godfrey Hurricane Fun Deck, Fiberglass hull, 175 HP, Deck boat
24' Chrysler Cruiseliner III (Lonestar), 120 HP, Aluminum Hull, Cabin, 1968
33' Carver Mariner, fiberglass hull, 520 HP, Yacht, 1977
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Topic author
nolacarver
Scurvy Dog
Scurvy Dog
Posts: 19
Joined: October 6th, 2013, 6:49 pm
Vessel Info: 1979 33' carver
New Orleans, LA

Re: Boat will not plane

Postby nolacarver » November 20th, 2013, 7:21 am

Just getting back to work on my boat... I did the test suggested by Fred and here is the results. Vacuum test: both read 18 at 700rpm jumps quickly to zero when I manually hit wot then drops quickly to 22 then back to 18. the needle chatters a little at idle. It has electronic ignitions and both engines are crusaders. Ticking noise from port is getting loader and the coolant level was very low, I think I may have a leaking head gasket. not sure how to tell for sure.
User avatar

United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 1920
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 39 times
Been thanked: 278 times

Re: Boat will not plane

Postby waybomb » November 20th, 2013, 7:31 pm

Is the "chattering" quickly between about 17 and 19? That would be worn valve guides. Wouldn;t worry about it too much if that ius what it is. How many hours on the engines, how often is the oil changed, and what oil are you using?

Idel vac is good and you throttle blip indicates a genreally good engine.

Need to find out what the noise is.
Does it seem to be under a valve cover? If so, pull that valve cover and look for a rocker arm when the cam is on the baseline. May be a bad lifter or someting with the rocker / pushrod / valve. Don;t go too long with this condition!
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft

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