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#1
IP: 24.19.235.108
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Got the engine Started! Now to trouble shoot odd running patterns
Hi All,
After posting a few weeks back about my engine not running due to what I thought was water in the fuel, I made some significant progress. Siphoned out the fuel and separated out the water, as well as emptying the fuel filter, and fuel bowl right before the carb, which also had water in it. I primed the whole line up to the bulb, and hooked it back up. I also changed the Oil, which was black as hell, but not milky, so at least there wasn't water in there! I tried starting it a number of times, to no avail. I popped out a spark plug, and noticed it as bone dry, so I went ahead and used the hand primer about 100 times (should it have resistance? I didn't feel any pressure.) After a couple of tries, I got it running again, for about 10 minutes, however the action of the engine, and its running pattern was very odd! At higher throttle, it did this odd thing (see video) I turned it off after getting nervous. https://youtu.be/qBRTHbDxUtQ Here it is with the throttle just about where I usually leave it for idling. Sounds Healthy! Except then I noticed a bit of smoke... https://youtu.be/IiTCR2vL4Ig It eventually stalled - my theory is overheating - check out the water out the exhaust. I remember reading it should be a steadyish stream, where as mine is just spitting it out bit by bit. Doesn't help that my thermometer isn't working. https://youtu.be/aaNws3w5dqA So hoping this is just my flexible impeller needing replacement, so i yanked it out and am about to order one... At the very least, I'm happy I got it running - as I feel like a running engine, even if not running well, is probably better than a non-running engine! Bonus video, you kinda see how much amazing engine access I have to work with... Maybe youll also spot something I need to fix! https://youtu.be/X_Ci1MTmcQQ |
#2
IP: 107.0.6.242
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Your engine looks good and sounds good; I would like to see more water coming out of that exhaust. Check the usual suspects for restrictions.
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Mo (03-21-2016) |
#3
IP: 24.152.132.65
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Looks to me like you're still dealing with contaminated fuel/dirty carburetor problems. In your post I did not see where you:
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
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Mo (03-21-2016) |
#4
IP: 98.171.163.112
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A Few Ideas
Are you sure that nothing wrapped around the prop?
The smoke could be from hot running. Are you RWC? It looked like it in the videos. Let's start with a little diagnosis before you start replacing cooling system parts. Low water flow can be caused by a of a few things. Partially blocked inlet to the water pump. Water pump impeller shot. Blockage of flow through the engine ie a thermostat that is stuck closed or blocked engine cooling passages. Another common place for blockages it is at the manifold outlet.The usual method of diagnosis for a RWC engine is to start at one end or the other of the cooling system and find out where the water flow is reduced. If running off an auxiliary fuel tank solves the fuel problem then the problem is before the fuel pump. If you still have fuel problems while running with the auxiliary tank then the problem is with the fuel pump and\or the carb. How long has it been since you've had a look at the distributor advance? Hang in there. You're getting close. TRUE GRIT |
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TimBSmith (07-04-2023) |
#5
IP: 24.19.235.108
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reply to JOHN COOKSON
Quote:
My Thermostat currently isn't reading at all, maybe that's an indication that it is stuck shut? Oddly, the smoke is coming off a section that was rusted, so I used WD40 as a cleaning solution - maybe it is just that burning off... For next weekend, I think I'm going to pop off and clean the carb, then try running it again. If that doesn't work, Ill do the auxiliary tank check. Is it worth changing the filter in the racor if I don't know its history? Will also order a new impeller as the one I took out seems like its hardened with the impellers in a bent position... |
#6
IP: 24.138.22.213
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Sounds and looks pretty good to me, I agree with the guys.
Smoke...once it's been running for a while and ensure everything is burned off check around the manifold and hot exhaust...that could take about 30 minutes...otherwise you may have to change the hot exhaust. Water, mine is about like yours at idle....might not be an issue at all. If impeller hasn't be changed recently by all means change it out anyway. A infra red thermometer is a good idea and you can usually pic one of those up for about $25 on sale. Neil mentioned fuel system/ carb...fully agree as well. It takes a second to block you carb with crud, and if the engine won't throttle up a carb blockage or sucking air ... among other possible causes those are the two I suspect right away.
__________________
Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. Last edited by Mo; 03-21-2016 at 08:05 AM. |
#7
IP: 107.0.6.242
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No one ever finally solves the problem of fuel contamination and system blockage. We are never more than a single particle a few thousandths of an inch in diameter from a fuel issue and that is why vigilant fuel filtration and monitoring are so important. The last two experiences (before the carb) fuel should encounter in an Atomic 4 are a 10 micron filter and a fuel pressure gauge. Keep trouble upstream where it is easier to handle. BTW, cleaning polluted fuel and reintroducing it to the system is dodgy IMO.
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TimBSmith (07-04-2023) |
#8
IP: 24.19.235.108
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Reply to ndutton
Quote:
2. I haven't cleaned the fuel tank interior, though am considering just getting a new tank. 3. Water got in because a friend left the fuel cap off in Seattle for a week (rain water went down the chute). 4. I filtered out all fuel, let the water separate, then siphoned most not all back into the tank. Next step is to top of the tank and add some fuel treatment. it sounds like maybe something to do with the carburetor or the main mechanical fuel pump, so I guess that'll be next weekends project... I do think that 2 owners back, the engine was worked on using moyer marine parts/manual, and possibly some love and TLC put in. A few years between then and now, and I think the engine needs another bout of love... |
#9
IP: 24.152.132.65
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edit: Quote:
Quote:
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others Last edited by ndutton; 03-21-2016 at 09:29 AM. |
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Bratina (03-21-2016) |
#10
IP: 74.40.11.135
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Quote:
Do you have any recommendation on types of fuel tanks? My current one is a big hunk of metal, I was thinking about switching to one of the plastic ones. |
#11
IP: 24.152.132.65
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When I replace my tank I'll have a hard look at the Moeller cross linked polyethylene tanks. Shawn Stanley has one in his boat and his experience has been favorable.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#12
IP: 108.31.90.116
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Quote:
If its galvanized steel, then definitely change it. (IMHO) If its aluminum then maybe, depending on the condition. If its Monel, then don't change it! Monel is like the gold standard for fuel tanks. It is a high nickel alloy that is very corrosion resistant. At one time, in the mid-70s, it was very common for fuel tanks, but now it's too expensive for boatbuilders to use. In appearance, monel is a dull color, somewhat similar to galvanized steel, but with a much smoother finish. Depending on the percentage of copper, it may acquire a slight greenish tint with age. Its is also poorly magnetic. A magnet will stick to it only weakly. More on Monel here: https://en.wikipedia.org/wiki/Monel
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@(^.^)@ Ed 1977 Pearson P-323 "Dolce Vita" with rebuilt Atomic-4 |
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Administrator (03-22-2016) |
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fuel delivery problem, fuel pump, overheating, stalling |
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