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Allis Chalmers Discussion Forum
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AC 160 leaking oil

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Jon Turner

12-30-2004 15:57:59




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On this Perkins diesel, I changed the head gasket, and tractor has been running fine for a month with no leaks. Today it starting leaking heavily. On the right rear of the block, there is a triangular flange bolted on, and on this flange is where the tachometer cable is connected. Below that connection on the flange there is a small hole (a weep hole???) and oil is pulsing out of that hole while the engine is running. What could be causing this????? I did not disturb or remove this flange during head gasket teardown.

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Paul Baxter

01-04-2005 14:11:47




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 Re: AC 160 leaking oil in reply to Jon Turner, 12-30-2004 15:57:59  
There is a seal in the plate you see. It seals around the back of the camshaft. Replace the seal and the oil leak will go away.



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Jon Turner

01-04-2005 16:55:23




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 Re: AC 160 leaking oil in reply to Paul Baxter, 01-04-2005 14:11:47  
Paul, I'm not sure what seal you might be talking about. The shaft that mates with the plate/tach cable coupler is not where the oil is coming from, but from a little hole beneath that coupling. The hole is all the way through the plate. I've discovered too that it only leaks when the engine is warm, but not when first started. I really don't have a lot of experience, but can't see why this hole wouldn't leak all the time anyway, but guess it must be some kind of breather hole, and in that case, my thinking was there was too much pressure internally that would be forcing oil out this hole. Any idea where I could locate a new seal???

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Paul Baxter

01-05-2005 10:18:22




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 Re: AC 160 leaking oil in reply to Jon Turner, 01-04-2005 16:55:23  
Unscrew the tach cable at the block and pull it out. Remove the bolts from the flange (three bolts?). You will find a seal in the block side of the flange. Pop it out with a screwdriver and press a new seal into the flange. Reinstall the flange on the block and attach the tach cable. I think the hole you are seeimg is a weep hole to direct oil to the outside when the seal is worn out, otherwise I think the oil would be directed up the tach cable and would probably make a mess of the tach mechanism.

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Jon Turner

01-06-2005 04:10:20




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 Re: AC 160 leaking oil in reply to Paul Baxter, 01-05-2005 10:18:22  
Paul, thanks for the help. Is this then actually by design, so that the hole is supposed to weep when the seal is bad? Also, this seal is the o ring that's inside there right? Any ideas where I could find a new one? Thanks again. JT



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Paul Baxter

01-06-2005 05:16:01




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 Re: AC 160 leaking oil in reply to Jon Turner, 01-06-2005 04:10:20  
It is not an o-ring. It is a conventional grease/oil seal with a metal rim and rubber lip seal.
I was able to get mine from my local Agco dealer.



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Jon Turner

01-06-2005 17:20:20




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 Re: AC 160 leaking oil in reply to Paul Baxter, 01-06-2005 05:16:01  
Paul, I don't have a grease/oil seal when I take the flange off. There was only a regular gasket where the flange meets the block, but I didn't see any seal. Is it possible there are some variations among the different 160 years?



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Paul Baxter

01-07-2005 18:41:58




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 Re: AC 160 leaking oil in reply to Jon Turner, 01-06-2005 17:20:20  
Yes, it is very likely that you have a different tach installation. My tractor was produced in 1969 and has the seal as I have described. I think your best bet is for you to take your tractor serial number to an Agco dealer and see if he can look up the proper seal for your application.



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Jon Turner

01-08-2005 15:34:06




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 Re: AC 160 leaking oil in reply to Paul Baxter, 01-07-2005 18:41:58  
Thanks Paul. Hey, it seems to me you've helped me out in the past with my naive questions on this 160. What's the chance of you sending me an email so I can cut down on the wait time the next crisis?

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No sweat otherwise, but thanks again. We're having a cold snap here in Missouri right now, so once it warms up a few degrees, I'll pull that flange again and find an Agco dealer. Otherwise, I might just plug the hole with Formagasket.

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gcasper

01-03-2005 19:44:26




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 Re: AC 160 leaking oil in reply to Jon Turner, 12-30-2004 15:57:59  
I am sure there is an oring inside the tach drive assy that is leaking. Orings get hard from age and heat so it will need need to be replaced.



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J Turner

01-04-2005 04:11:38




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 Re: AC 160 leaking oil in reply to gcasper, 01-03-2005 19:44:26  
Thanks, but it's not leaking out the tach assembly, it's leaking out a small (less than 1/8") hole just below the tach cable connection. I figure it must be some over pressure situation in the engine, but the breather is clear. The leak only occurs at operation temp as well, not when cold.



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