engine slows, bogs and stalls...
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=3822
Printed Date: January-16-2025 at 3:00pm
Topic: engine slows, bogs and stalls...
Posted By: 72South
Subject: engine slows, bogs and stalls...
Date Posted: June-09-2006 at 4:23am
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Hi All,
I'm a "new" owner of a 72 southwind. I've had several boats, but this is my first "true" inboard. I've spent a few weeks reading most of the post, but i am stumped on this one. These days I'm just mecianical enough to be dangerous :) I bought it over the winter. had it cranked in a fake lake, but I just got it in the water. it idles beautifully. i gave it the gas, it got to about 3000 (ish) rpm's then slowly started to bog, lose rpms and basically slow to an idle (with the juice in full forward) then stall. I let it sit, then managed to crank it and nurse it back to the ramp. wife was NOT happy as i had also bought the boat with out her permission :( due to time, travel and no tune up tools (timing light etc...) I took it to a local marina. they re built carb, new points, plugs, cap, condenser etc... it runs smoother, better and longer, but still has the same problem. can't rev up enough to recreate on fake lake, but i'm tired of 10 minute excursions :( almost certain it is a fuel related issue. loosened gas cap, but no help... Best recommendations to track down? It is a PCM ford with holly 4170 (I think) BTW, I like the local marina. think they will resolve it eventually, called him, he indicated they would give it a "on water" test and track it down. Said it sounded like a fuel delivery problem and that the fuel systems on this age boat wasn't the most realiable. But I thought I would do my part first... regards, johnny PS "She, who must be obeyed" is getting a lot of mileage out of this, and every mistake that I have ever made is back on the table. Dear God, I'm in a tight... I need some help!  ------------- Regards, johnny |
Replies:
Posted By: 77stang
Date Posted: June-09-2006 at 6:24am
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Tell her to hush or you'll name the boat
"The Quiet One" Anyway, congrates on the boat. really doesnt sound like that much of an issue. There is some folks here that can get you pointed in the right direction and in the right order of diagnosis. Good Luck ------------- http://correctcraftfan.com/diaries/details.asp?ID=1360&yrstart=1971&yrend=1975 - '77 Mustang 17 |
Posted By: GottaSki
Date Posted: June-09-2006 at 6:30am
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Fist step name the boat
Kwitchyabitchin Secondly, Replace the fuel line, filters, disassemble and clean out the pickup tube in the tank. but I suspect you won't be redeeemed even when it runs good. ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: 79nautique
Date Posted: June-09-2006 at 7:31am
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First place I would look is replacing the fuel/water seperator, the big oil filter look thing inline with the fuel line, then the vent on the gas tank.
You need to replace the point with a new Electroinc Dist. or at least a conversion kit. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique |
Posted By: Tim D
Date Posted: June-09-2006 at 8:09am
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Getting to 3000 then it dies, sounds like the timing could be set too high and it is over advancing. ------------- Tim D |
Posted By: Bradley950
Date Posted: June-09-2006 at 8:28am
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A few summers ago my Natique done the same thing. It ended up being the combination of a few things. The pick up in the tank had some crap on the screen, my fuel water sep. had a clogged filter element, and my tank vent line had some junk clogging the vent screen. The vent filter eventually got full due to filling the tank up and it sometimes spitting out. Well all the crap in the tank that got stirred up while putting gas in tried to come out the vent. These things fixed my problem, good luck with yours, and congrats on the new 72 southwind!! ------------- Brad Miller bradley950@yahoo.com |
Posted By: 79nautique
Date Posted: June-09-2006 at 8:29am
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I would think it's highly unlikely that the timing is that far off considering that they just installed new points and condinser and re-built the carb, I would think that a desent mechanic wouldn't over look something like that after replacing what they did. Beside if it was the mechanical advance advancing to much then it would start right back up or run fine once the rpm decreased. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique |
Posted By: AWhite70
Date Posted: June-09-2006 at 8:31am
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Could this be a problem with the ballast resistor? I don't have much experience with them but I seem to remember folks talking about similar problems being fixed when they replaced a defective ballast resistor. ------------- AWhite70 http://www.correctcraftfan.com/diaries/details.asp?ID=562&sort=revyear&pagenum=5&yrstart=1976&yrend=1980" rel="nofollow - '79 Ski Nautique |
Posted By: 6strings
Date Posted: June-09-2006 at 8:56am
| Probably not the ballast resitor. When it goes, your done until you bypass it. |
Posted By: JoeinNY
Date Posted: June-09-2006 at 9:33am
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Its the marinas problem now they are on the right track with the fuel delivery system just dont let them get crazy with an add-on electric pump or other such nonsense. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: David F
Date Posted: June-09-2006 at 10:53am
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A 72 YM might not have a water seperator/filter, but instead just an inline filter somewhere.
I agree, it is a fuel delivery problem. If it has an inline filter, make sure the hose clamps are the correct size for the fuel line and tight. Air leaks at the filter will cause such symptoms. Remove the tank tube and clean all the screens. Check fuel pump delivery. The reason the problems does not happen on the trailer is that you are not loading the engine and hence need less fuel. The current state of the fuel system can keep up, UNTIL you load the engine and need more fuel. Clean the entire fuel system, starting at the tank, make sure you have no air leaks on the suction side or a kinked fuel line. ------------- |
Posted By: Fook_U
Date Posted: June-09-2006 at 6:15pm
| what does the spark plug look like after it dies? |
Posted By: 72South
Date Posted: June-12-2006 at 9:30pm
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Hi All,
Thanks for the advice. Mrs 72south has eased a bit, but I'm still on a short leash :) I decided to pull the tank (drained it this afternoon), then I am going to take it to a radiator (sp?) shop and have it "boiled".. I think that is the correct term. Then I am going to replace the fuel system from it to the engine. Shouldn't be much $ and it will make me feel better. Will let you know after this weekend. johnny ------------- Regards, johnny |
Posted By: Mercrewser
Date Posted: June-12-2006 at 10:49pm
We had the same problem on our test run on Sunday. Here is an easy fix! Got us back to the ramp, no problem!!
Ordering a new fuel pump tomorrow, so we can put that fuel tank back on the go cart were it belongs! ------------- 1969 Chris Craft Commander SS #39 |