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| Engines Discuss engines |
Topic Review (Newest First)
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| 10-02-2013 06:07 PM | |
| kip51035 |
Re: YS45 problems Like Jack said residual oil in the regulator is usually the culprit. The drilling from the regulator is quite small and plugs with congealed oil, same with the carb. Automatic transmission oil is a good flush agent. Transmission oil can be forced through the regulator and carb with a pump type oil can and the throttle wide open. You will have to flush that out with fuel. The last one I ran it just took 3/4's of a tank of running to clear the system out. Only take the regulator apart as a last resort, they are a little tricky and the gasket is easily damaged. |
| 10-02-2013 04:54 PM | |
| Jack in NB |
Re: YS45 problems Hello again Derrick - Did a quick search and found 3 possibilities for Carl: Carl Bachuber, somewhere in SW Ont; Carl in Niagara Falls, and Ontaeronut in Kenora. Is one of these the chap you mentioned? |
| 10-02-2013 04:27 PM | |
| Jack in NB |
Re: YS45 problems Thanks, Derrick for the quick reply. I disassembled the regulator to check for dirt or soggy gaskets - clean as a whistle. Pressure screw returned to its original setting flush with the case (and an index mark I scribed). I'll look around for Carl. |
| 10-02-2013 03:55 PM | |
| tallone66 |
Re: YS45 problems To start, hope you did not adj the regulator. Factory set, and you will have a bear of a time setting up. Sounds like the pump itself is the culprit. You might want to contact Carl out there, he used to sell these engines and knows his way around them quite well, and he will probably have the pump parts in stock. Derrick |
| 10-02-2013 03:37 PM | |
| Jack in NB |
YS45 problems Folks - Have a mint YS45 that I've been struggling to get running comfortably, to use in a goldberg Cub. Finally got it going on the test stand, ran for a few tanks of fuel with a 10-6 prop. Put a pressure gauge (0-10 psi) on pressure line, got 2-3 lb up to 5000 rpm, and it climbed to 4 1/2 at 10,000 range. Once I got it running, I tried lowering the tank 3" or so (the cub tank is a couple of inches below the carb), no difference at that stage. Got the carb and regulator adjusted, I thought, (it now worked fine) then mounted it sideways in the cub. It would start right off on prime, then slowly die after 30 secs or so - the same behaviour as in the initial runs on the stand. Rechecked pressure on the pressure side, same as above, then on the fuel side just before the filter, same result as before - 3 to 4 1/4 lb, quite a bit lower than the 6 - 9 psi reported elsewhere. Removed the engine and tank from the cub, and put the whole assembly together on the test stand. Finally got it running again - and no change to the carb adjustment. Reinstalled in the cub, same startup and dying on prime. Changed plug, no difference. Checked fuel filter and check valve, both clean, and the check valve has a definite one-way action. There are no crank-case leaks evident. Clamped the fuel delivery line after one brief run to 4 psi, and the pressure remained until I removed the clamp a half hour later - so no leaks in the system, and the check valve is doing its job. Then tried pressurizing the system before starting, and it stayed running. Would restart ok, accelerate, and run nicely until the tank ran dry. Restarting - needed re-pressurizing. It seems that the fuel isn't getting to the carb through the regulator until it gets that kick from the outside pressure source. Possibly due to the lower system pressure? OK gurus, any thoughts about what's going on here? Why the lower system pressure, and why the refusal to stay running after the prime? |
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