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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Cat D7 17A Oil pouring into Clutch

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david welsford

07-13-2007 18:25:07




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I just bought a late 50s early 60s Cat D7 17A.

It pours crankcase oil into the wet clutch. The guy I bought it from says it needs a rear seal. I feel like a rear seal would be a slower leak than what I am experiencing. Any help would be appreciated.




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David Welsford

07-21-2007 19:37:00




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 Re: Cat D7 17A Oil pouring into Clutch in reply to david welsford, 07-13-2007 18:25:07  
Old Magnet,

Thanks for the help. I got the dozer delivered a few days ago. Oil is still leaking into the clutch housing. I worked on it a bunch now. I've had trouble with the starter hanging up. I replaced the solenoid, but it still hangs up a little. This was causing the battery terminals to melt. These problems coupled with me running out of diesel, and having to bleed the system made for alot of frustration, but I got it going now.

The dipstick says on it to check it when it's running. When I did, oil starting blowing up at me, also right above where you add oil is the breather, I guess, and it looks like exhaust is coming out of it. Could these be clues to why so much oil is dumping out of the rear seal? Also the cylinder closest to the driver is not firing. It's getting fuel, but not firing. It's probably an injector. Can these be rebuilt?

Thanks.

David

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Old Magnet

07-21-2007 20:04:29




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 Re: Cat D7 17A Oil pouring into Clutch in reply to David Welsford, 07-21-2007 19:37:00  
Congratulations on getting er going....Is this a direct start conversion or are you talking about the pony electric start??
Having the sump pressurized would help explain the oil gain in the clutch housing, it's probably overwhelming the sealing system. Could be a problem with that one cylinder...broken rings...hole in piston...liner problem.... Yes the injectors can be tested and rebuilt but it will require an old time shop with knowledgeable folks to do it.

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Old Magnet

07-15-2007 23:25:05




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 Re: Cat D7 17A Oil pouring into Clutch in reply to david welsford, 07-13-2007 18:25:07  
I've just received confirmation that the later parts that improved the sealing on both the front and rear main bearings can be (may have been retrofitted already) installed on prior serial number tractors that didn't have the seals.



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David Welsford

07-14-2007 13:46:19




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 Re: Cat D7 17A Oil pouring into Clutch in reply to david welsford, 07-13-2007 18:25:07  
The dozer is still a few hours drive from where I am now, but I have written in the front of the service manual 17A2566C. This means no rear seal, right?? Either way, is there another way to lose oil into the flywheel housing? If the bearings are loose, then pulling the crankshaft, turning it, and replacing the main bearings is the solution?

Thanks for any input!



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Old Magnet

07-14-2007 19:52:22




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 Re: Cat D7 17A Oil pouring into Clutch in reply to David Welsford, 07-14-2007 13:46:19  
No seal was used on that model (1955).
Yes, seems a bearing job is in order.
Only other source of oil into the clutch housing would be past the pony pinion seal.



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Old Magnet

07-13-2007 19:51:03




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 Re: Cat D7 17A Oil pouring into Clutch in reply to david welsford, 07-13-2007 18:25:07  
Depends on the serial number of your unit. Early serial numbers did not have a rear seal, just oil return threads, slingers and drain slots. After about sr. no. 17A5223 (1956) a rear seal was added.
Still bearing clearances are the main source of oil control.



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David Welsford

10-22-2007 20:08:55




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 Re: Cat D7 17A Oil pouring into Clutch in reply to Old Magnet, 07-13-2007 19:51:03  
Old Magnet, Thanks for your help. We have come to live with the oil leak. We get used oil for free, and use it a like we use diesel. It's kind of like a giant 2 stroke. I have another question for you though.

The sprocket on the left side seems to be wearing really badly onthe inside. Every once in a while the tracks seem to get off and I hear a clank clank clank. We tightened the track, but the problem continues. Could it be an alignment problem?

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