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Allis Chalmers Discussion Forum
:

D17 series IV diesel rear main leak

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Mattr2589

07-18-2015 05:50:13




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After cutting a field for 2 hours or so I pulled back in the shop and noticed a steady drip every half second or so. I split the tractor and ordered a new rear main. Mine has a one piece that presses in the rear motor plate. It then has a no-ring that goes around the backside of the rear main to seal the block and oil pan. Anyway, put it back together and pulled it out. Within 5 mins it was leaking the same as before. It's dripping out of the inspection hole in the bottom of the bellhousing. It's not the transmission leaking because I can see it. I split the tractor again and pulled the flywheel. Seal looks fine and it's definitely leaking. Has anyone gotten a bad seal or have any advice. I installed the new wear sleeve so I know it's the right size. Thanks in advanced.

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DrAllis

07-19-2015 14:26:16




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 Re: D17 series IV diesel rear main leak in reply to Mattr2589, 07-18-2015 05:50:13  
If the umbrella seals are leaking on the injection pump drive shaft AND overfilling the crankcase with diesel fuel, it sure could contribute to a leaking rear main oil seal. Regardless, if it is overfull of diesel fuel in the engine oil, you must correct that problem, rear seal leaking or not.



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Mattr2589

07-19-2015 15:45:29




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 Re: D17 series IV diesel rear main leak in reply to DrAllis, 07-19-2015 14:26:16  
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Is this something I can do or do I need to send the pump off? I am a mechanic.



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jr1983

07-19-2015 05:41:17




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 Re: D17 series IV diesel rear main leak in reply to Mattr2589, 07-18-2015 05:50:13  
Your main bearings are shot. The crank will drop in relation to the seal as they wear. After a while the gap gets big enough to let oil out.



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Mattr2589

07-19-2015 09:42:46




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 Re: D17 series IV diesel rear main leak in reply to jr1983, 07-19-2015 05:41:17  
So, I pulled the rear plate off to check for play in the crankshaft. When I did it dumped a quart or two of oil on the ground. The first time I removed the rear plate I didn't lose any oil. The oil is very thin and runny. Seems like it has a bunch of diesel fuel mixed with it. I just had the head repaired for cracks between the valve seats. If the oil is over filled and too thin, I guess this could cause it to leak. Any known concerns for diesel in the oil?

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DrAllis

07-19-2015 10:55:28




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 Re: D17 series IV diesel rear main leak in reply to Mattr2589, 07-19-2015 09:42:46  
Quoting Removed, click Modern View to see Umbrella seals on the injection pump driveshaft.



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Mattr2589

07-19-2015 11:37:40




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 Re: D17 series IV diesel rear main leak in reply to DrAllis, 07-19-2015 10:55:28  
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Could this be why it's leaking oil?



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DrAllis

07-18-2015 20:53:51




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 Re: D17 series IV diesel rear main leak in reply to Mattr2589, 07-18-2015 05:50:13  
Well, I'm not thinking main bearings just yet. You say you replaced the rear main seal. Did you remove the old steel wear sleeve off of the flywheel nose and install a new steel wear sleeve??? It has to be there and it will surely leak if it isn't.



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Mattr2589

07-19-2015 04:32:24




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 Re: D17 series IV diesel rear main leak in reply to DrAllis, 07-18-2015 20:53:51  
i did replace the wear sleeve. I am going to pull the rear cover back off and check the play in the crank. That was the only other thing I could think of. I figured if the mains were wore out bad enough for it to leak then surely it would be knocking. Anyway, I will check it later and let y'all know. Thanks.



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jr1983

07-18-2015 20:02:18




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 Re: D17 series IV diesel rear main leak in reply to Mattr2589, 07-18-2015 05:50:13  
Your main bearings are shot. The crank will drop in relation to the seal as they wear. After a while the gap gets big enough to let oil out.



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jr1983

07-19-2015 19:12:59




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 Re: D17 series IV diesel rear main leak in reply to jr1983, 07-18-2015 20:02:18  
Sorry I didn't mean to post twice.main bearings wont cause a knock until they spin and cut off oil to the rod and cause it to spin. That said I agree that if it is over full I'd address that first and the umbrella seal is the most likely culprit if they use a pump like a 190. Not sure on that one.



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