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Harry Ferguson Tractors Discussion Forum
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fuel in oil pan

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David in Enola

09-26-2007 13:06:30




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My TO 20 has fuel in the oil pan. Not sure how this is happening, but I've checked the float and needle valve and they seem to be working ok.
Also have backfiring, especially under a load. I've replaced the coil,points & condenser back some time ago. Any suggestions would be appreciated.
David




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Jerry/MT

09-26-2007 16:42:44




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 Re: fuel in oil pan in reply to David in Enola, 09-26-2007 13:06:30  
You might want to make sure that your timing is correct (7oBTDC per the Ferguson Shop Manual) for your TO-20 and that the advance mechanism is working correctly. You'll need to have a timing light for the latter check. John (UK) and George have also provide you good advice.



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gshadel

09-26-2007 14:16:57




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 Re: fuel in oil pan in reply to David in Enola, 09-26-2007 13:06:30  
David, your carb needle valve may still leak gas through over a long period of time, hours or days , flood the carb, and actually back-up into the intake.. into the oil pan. I'm assuming you are not using a fuel shut-off valve above the bowl, or the shut-off is leaking through. Check your shut-off valve to insure it closes tight & use it. That is the only way to insure you don't flood the carb. The needle valve in the carb just doen't do a good job resisting the constant pressure of your gavity feed fuel system.

George

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David in Enola

09-26-2007 16:05:50




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 Re: fuel in oil pan in reply to gshadel, 09-26-2007 14:16:57  
Thanks for the info. I didn't know it was necessary to shut the fuel off when not in use. Is this common? Also, is this the only way fuel is able to enter the oil pan?
Thanks



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gshadel

09-27-2007 15:45:29




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 Re: fuel in oil pan in reply to David in Enola, 09-26-2007 16:05:50  
yes common in TO's & N's, both have similar upflow M.S. carbs with gravity feed fuel supply. I've heard stories where entire gas tanks drain in to the engine and fill the crankcase. I used to have trouble with my carb flooding and gas dripping out the air intake on the carb... Your upflow carb is actually pretty sensitive to having the carb bowl being over-filled. The gas can't vaporize properly & causes hard starting. Using the shut-off is a good idea.

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Jeff-oh

09-27-2007 07:19:58




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 Re: fuel in oil pan in reply to David in Enola, 09-26-2007 16:05:50  
Shutting off the fuel at the glass bowl fuel filter is good practice. Else a full carb rebuild may be needed. Over time small deposites, wear, leaks in the float etc can degrade the sealing capability of the needle valve.



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John (UK)

09-26-2007 13:25:29




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 Re: fuel in oil pan in reply to David in Enola, 09-26-2007 13:06:30  
Check if the battery is fitted negative to ground, this can cause it.It should be POSITIVE to ground unless you have an alternator. Check if there is wear in the Distributor shaft by turning the engine until the points are about to open and then push the shaft towards the points, if they open there is wear in the bearing and it is doing that all the time it is running and causing the points not always to open to the correct setting.
Move the ground lead from the back of the Dash panel to one of the Starter bolts too, use heavy leads not cheap car thin type as they are not heavy enough. The points should be gapped to .015" and the plugs should be .025", AC86 or Champion 8 plugs.

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Jeff-oh

09-27-2007 07:17:38




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 Re: fuel in oil pan in reply to John (UK), 09-26-2007 13:25:29  
Okay John, How does haveing the battery hooked up backwards cause fuel in the oil? (or are you helping with the back fire issue?)



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