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SMOKY EXHAUST - SHEEN ON THE WATER
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jralbert
#1 Posted : Saturday, September 24, 2011 4:36:18 PM(UTC)
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After ascertaining there was some gunk in the fuel filter (and, who knows, some may have gotten past the filter), the engine was running smoky today. And there was a sheen on the water. Grayish/bluish smoke. Not black. Engine appears to run pretty smoothly past 1000 rpm...will stall below 800.

If I try to restart immed after letting it warm up, I have to push the throttle wide open before the engine will catch on. If it sits 15 mins (assume the carb bowl is clearing) it will start normally.

I am asuming the sheen could be unburned gasoline but it continued to appear on the water even after engine warmed. If that is true (gas vs oil), do I assume I need pay some kind of attention to carb. If it's oil, what then?

Clues/hints/tips?? thnx
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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Ed
#2 Posted : Sunday, September 25, 2011 12:34:20 AM(UTC)
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Run it and then pull a sparkplug. If it's black and sooty, check the float level of the carb. Sounds like it is running rich from a sunk float or inlet valve stuck open.
Good luck, Ed
BUSIA
32 foot, no flybridge, twin 350 (chevy) Crusaders, closed (freshwater) cooling, 1:1 Velvet drive transmissions.
Proud to be IBEW.
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Docsnow
#9 Posted : Monday, September 26, 2011 10:25:21 AM(UTC)
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Joel,

If a dirty carb turns out to B your problem, U may want to try what I was doing just before I sold my boat Boo hoo! when I knew that the eng. wouldn't B started in a while I’d turn the gas valves of an let it idle til the eng. would start to sputter than spray fogger in carb in my opinion with ethanol in most fuels now & the gas evaporating in the carb if not run dry it doesn’t leave the gunk in the carb after the gas evaporates. Albeit a a Pain in the A$$ it's better than a jack up carb once a season. Just a suggestion Anxious

Norm

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http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

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tundrarules
#11 Posted : Tuesday, September 27, 2011 1:39:35 PM(UTC)
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Originally Posted by: jralbert Go to Quoted Post
After ascertaining there was some gunk in the fuel filter (and, who knows, some may have gotten past the filter), the engine was running smoky today. And there was a sheen on the water. Grayish/bluish smoke. Not black. Engine appears to run pretty smoothly past 1000 rpm...will stall below 800.

If I try to restart immed after letting it warm up, I have to push the throttle wide open before the engine will catch on. If it sits 15 mins (assume the carb bowl is clearing) it will start normally.

I am asuming the sheen could be unburned gasoline but it continued to appear on the water even after engine warmed. Clues/hints/tips?? thnx


Joel,
I see in a few post ago...you are trying to sell the ole girlNot talking ..engine dying while docking. Did you get new fuel?

Tell us about your carbs, old or new?
Did you run the engine under a load or just at the dock?


Couple of things come to mind, stuck choke, or maybe ignition problem to one or more cyl, which would cause no fuel burn in cyl. Inboard plugs are easy, outboard plugs...not so muchSick .

I would...
1) Make sure choke is working correctly. (3/8 cracked open when cold, full open when warm)
2) Trash stuck in needle seat/float..rap on side of carb with screwdriver handle several times.
3) Trash stuck in idle circuit...remove idle screws from carb (note number of turns), blowout with air, replace idle screws.
4) Swap carbs as pfhlaw suggested. 10 minute job Liar
5) If old carbs, are you better off paying someone to rebuild?
Perhaps you would be better off buying factory reconditioned carbs (Edelbrock 1409s) Cheapest here http://www.nationalcarburetors.com/marine/fourbarreledelbrock.aspx...You must weigh your options


Look at page 22 in this owners manual for carb troubleshooting 1409 owner manual

Let us know what happens... good luck.



BigM
1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL

RETRO BOATS ARE COOL

If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.
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jralbert
#12 Posted : Tuesday, September 27, 2011 10:40:59 PM(UTC)
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tundrarules wrote:
Did you get new fuel?

Tell us about your carbs, old or new?
Did you run the engine under a load or just at the dock?


Couple of things come to mind, stuck choke, or maybe ignition problem to one or more cyl, which would cause no fuel burn in cyl. Inboard plugs are easy, outboard plugs...not so muchSick .

I would...
1) Make sure choke is working correctly. (3/8 cracked open when cold, full open when warm)
2) Trash stuck in needle seat/float..rap on side of carb with screwdriver handle several times.
3) Trash stuck in idle circuit...remove idle screws from carb (note number of turns), blowout with air, replace idle screws.
4) Swap carbs as pfhlaw suggested. 10 minute job Liar
5) If old carbs, are you better off paying someone to rebuild?

Look at page 22 in this owners manual for carb troubleshooting 1409 owner manual
BigM

Fuel: is "old" -end of last season. But is same age as fuel that feeds the smooth running engine. And when I swapped fuel tank feed thru the crossover system, engine still behaved abnormally. FIlters drain clear fuel but I am changing the filter just as a precaution.

-Carb (just one engine misbehaving) was rebuilt at beginning of last season.

Tuned: had idle adjusted in July, gave smooth performance at the dock. Ran smoothly at dead low speed (6-800 rpm), no smoke, no sheen.

-Will check plugs for fouling signs. and the carb needle, swap stuff. Plus will run some carb cleaner thru it.

My guess as I may have noted above is that when I took her out for a demo ride last week, the tank sloshed gunk that got past the filter for that engine but not the other.

All in all, another rebuild may be cheaper in the long run than paying a mechanic to fool around @ $80/hr.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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jralbert
#13 Posted : Saturday, October 01, 2011 10:33:25 PM(UTC)
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Ran engine ystdy w/mechanic on hand to change the two filters (primary Racor and secondary at the carb inlet) and play w/idle screw. The little one came out a little plugged but not entirely. There was some "caviar" looking gunk in the bowl of the Racor - but it appeared that filter did its job of keeping the gunk or at least most of it from passing thru. Engine continued to run smoky and tossed a gasoline sheen out the exhaust.

have decided it's probably (as the board's wise men have pointed out) a stuck float which continues to call for fuel, flooding the carb.

It's going out for a rebuild. Thnx for all the great input.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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