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Case 446 troubles.
Posted: Thu Mar 16, 2023 3:57 pm
by propane1
She acted up couple of times in the last times I’ve used it.
I’m thinking dirt some where. What are you thoughts.
Video of it. Easier to see than for me to explain.
Noel
https://youtu.be/wG7epCMf3zM
Hopefully video works.
Re: Case 446 troubles.
Posted: Thu Mar 16, 2023 4:06 pm
by DavidBarkey
propane1 wrote: ↑Thu Mar 16, 2023 3:57 pm
She acted up couple of times in the last times I’ve used it.
I’m thinking dirt some where. What are you thoughts.
Video of it. Easier to see than for me to explain.
Noel
https://youtu.be/wG7epCMf3zM
Hopefully video works.
Sorry Noel I could not pick up what was wrong from the video. Can you describe it . Like is it bogging down , surging , backfireing , ect.
Re: Case 446 troubles.
Posted: Thu Mar 16, 2023 4:36 pm
by Spike188
In the video at the 6:15 mark, the engine stalls. It does not sound like a fuel issue to me. I am leaning toward the ignition system. I have seen this type of issue come from a faulty key switch, or wiring harness. It may be hard to find.
Re: Case 446 troubles.
Posted: Thu Mar 16, 2023 4:58 pm
by propane1
DavidBarkey wrote: ↑Thu Mar 16, 2023 4:06 pm
propane1 wrote: ↑Thu Mar 16, 2023 3:57 pm
She acted up couple of times in the last times I’ve used it.
I’m thinking dirt some where. What are you thoughts.
Video of it. Easier to see than for me to explain.
Noel
https://youtu.be/wG7epCMf3zM
Hopefully video works.
Sorry Noel I could not pick up what was wrong from the video. Can you describe it . Like is it bogging down , surging , backfireing , ect.
It’s been running like it’s very lightly stumbling Dave. Sorta like bad plugs, fire jumping from spark plug wires or fire jumping at the coil. As if it’s wet wires or coil. But the other day it stumbles a number of times and I had to play with the throttle and choke to get it to run sorta normal. Then ran, but sorta off. So today the same thing. Was running and doing the same sorta not running perfect sound and then she just blep blop blep blop and quit. I said , I see. That’s just great. So tryed a restart and after turning for a few seconds it started. Normally starts real quick. Then finished what I was doing. But still had that off sound like it was sorta mini missing.
Hopefully that helps.
Noel
Re: Case 446 troubles.
Posted: Thu Mar 16, 2023 5:11 pm
by DavidBarkey
Spike188 wrote: ↑Thu Mar 16, 2023 4:36 pm
In the video at the 6:15 mark, the engine stalls. It does not sound like a fuel issue to me. I am leaning toward the ignition system. I have seen this type of issue come from a faulty key switch, or wiring harness. It may be hard to find.
Thanks Eugene , I missed that the first time .
Re: Case 446 troubles.
Posted: Thu Mar 16, 2023 5:24 pm
by DavidBarkey
propane1 wrote: ↑Thu Mar 16, 2023 4:58 pm
DavidBarkey wrote: ↑Thu Mar 16, 2023 4:06 pm
propane1 wrote: ↑Thu Mar 16, 2023 3:57 pm
She acted up couple of times in the last times I’ve used it.
I’m thinking dirt some where. What are you thoughts.
Video of it. Easier to see than for me to explain.
Noel
https://youtu.be/wG7epCMf3zM
Hopefully video works.
Sorry Noel I could not pick up what was wrong from the video. Can you describe it . Like is it bogging down , surging , backfireing , ect.
It’s been running like it’s very lightly stumbling Dave. Sorta like bad plugs, fire jumping from spark plug wires or fire jumping at the coil. As if it’s wet wires or coil. But the other day it stumbles a number of times and I had to play with the throttle and choke to get it to run sorta normal. Then ran, but sorta off. So today the same thing. Was running and doing the same sorta not running perfect sound and then she just blep blop blep blop and quit. I said , I see. That’s just great. So tryed a restart and after turning for a few seconds it started. Normally starts real quick. Then finished what I was doing. But still had that off sound like it was sorta mini missing.
Hopefully that helps.
Noel
What I did not see when you got it running again was any black smoke / unburnt fuel from the ignition failing . It sounded to me like it ran out of gas under load . Check the fuel tank screen . If there is not one there , have someone watch at the fuel fitting in the tank and carefully blown gently back through the fuel line and see if anything comes out like a fly or other debree . Stuff that size will get sucked down the fitting but can't get past the 90 . Other thing to check ids the gas cap . Take it a part and make sure nothing has made a nest in there .
Re: Case 446 troubles.
Posted: Thu Mar 16, 2023 5:47 pm
by propane1
Thanks Dave. It maybe a while before I get to it. It als seems hotter than normal. So could be running lean.
But where the exhaust pipe comes out of the hood it was black there.
It’s a strange engine. Some times black in bonnet and some time not. Over the time I’ve had it.
Noel
Re: Case 446 troubles.
Posted: Fri Mar 17, 2023 9:29 am
by propane1
Pictures of the plugs in it. Don’t look to bad to me. I’ll check the gap before I put them back in.
Noel
Re: Case 446 troubles.
Posted: Fri Mar 17, 2023 9:44 am
by DavidBarkey
Like you said Noel , it comes and goes . But you did play with the choke to get it to run right so would be masking what is going on . Need to check them when it quits . Let cool some then check them before trying to restart . Water in the fuel can make it run lean as well . A little water in the float bowl will close the needle of at a lower fuel level . Black on the hood is most likely from starting (choke on ) . As there was no snow blowing back on to the engine in the video to cause a wet ignition problem . I doubt it is that , but anything is possible .
Re: Case 446 troubles.
Posted: Fri Mar 17, 2023 10:11 am
by Eugen
I'm no expert but didn't lots of people have problems with the intake manifold on these Onans? Another usual suspect is fuel delivery. Crud in the tank or along the line. Take the carb bowl off and see if you got some crud there.
To me the spark plugs don't show any sign of trouble.
Re: Case 446 troubles.
Posted: Fri Mar 17, 2023 10:56 am
by propane1
Well I put the plugs back in after checking gap. I then took the main jet adjustment screw out. Sprayed carburetor cleaner thru main jet. Put adjustment screw back in and left it out 1 1/2 for adjustment. Left the air cleaner off, filter is good by the way. Out I went and moved a bit of snow, since we got more last nite. Worked good. I know it’s the easy way out, spraying carburetor cleaner in it instead of taking it all apart. But will see how long it keeps going.
Picture of exhaust on bonnet. Yesterday and today. I would say the adjustment screw was at about one turn out. Before I took it out to clean.
Jumpins. Quite a ramble.
Noel
Re: Case 446 troubles.
Posted: Fri Mar 17, 2023 11:50 am
by Eugen
You know I've had problems with the fuel on both my 444 and 644. The dirt I found in the carb coming from the tank and from the line to the carb was, in my case, like fine sediment. That type of dirt doesn't really get unclogged with carb cleaner. But maybe you have a different problem. You'll figure it out.
Re: Case 446 troubles.
Posted: Fri Mar 17, 2023 12:45 pm
by DavidBarkey
Noel didn't you reseal the intake last year ? If not , that is something to look at like Eugen said . My pipes a re blacker than that from starting with choke which is very common .
Re: Case 446 troubles.
Posted: Fri Mar 17, 2023 12:59 pm
by ras101
Looking at the plugs.. they look black to me (bad angle?) . think it might be an electrical issue here but way too early to tell.