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D4 7U54 big time oil leak

D4 7U54 big time oil leak

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JJM
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Greetings acmoccers. I have not been on the site in many years after so much help with my first D47U which is still running strong and fun. I just paid scrap price for a D47U54 (yep, that's the full serial number). It is a bit worn, but the hardnose, holt blade, hydraulics, even a complete battery box with cover, working lights and wiring, etc. are all there. After cleaning the carb and replacing the condenser, the pony fired right up. Runs a bit funny, but it feels like it is just a matter of adjustments. Now the bad news: when I engage the diesel, it turns over just fine, but after about 30 seconds, oil starts pouring out the front end of engine somewhere around the lower pulley. It is hard so see exactly where with moving parts and a lot of oil coming out - 1 or 2 quarts per minute! I am wondering/hoping if there is a plug or other easily repaired issue here. I am not a mechanic, but have seen enough failed engines to be truly impressed with this leak without a rod poking out somewhere. If it is the front shaft seal, I have to wonder how it could get that bad just sitting there.

I bought it for a parts supply for my running cat (that's what I told the wife, anyway), but I really was hoping to save the 54th Kitty of the 7U series. Any thoughts would be appreciated.

JohnM
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Tue, Jul 2, 2013 3:24 AM
neil
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Seems like it could only be a couple of options:
- seal is missing the rubber part, or the whole seal is missing (I just pulled apart my pony clutch and some idiot assembled it without the nut that holds the big bearing in place)
- front case has a crack/hole. Either replace or weld/JBWeld it up

In both cases, it would seem a fairly straightforward fix. I'd bet on the seal being defective and of course seals like that are cheap. I say save the low serial # tractor! : )

Cheers,
Neil
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Tue, Jul 2, 2013 5:16 AM
Rome K/G
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Reply to neil:
Seems like it could only be a couple of options:
- seal is missing the rubber part, or the whole seal is missing (I just pulled apart my pony clutch and some idiot assembled it without the nut that holds the big bearing in place)
- front case has a crack/hole. Either replace or weld/JBWeld it up

In both cases, it would seem a fairly straightforward fix. I'd bet on the seal being defective and of course seals like that are cheap. I say save the low serial # tractor! : )

Cheers,
Neil
Oil cooler leaking? Lines leaking?
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Tue, Jul 2, 2013 5:54 AM
JJM
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good thoughts, I appreciate the feedback. I forgot to mention that when I shut off the pony and let things sit, the oil continues to drain for several minutes. Looks like I have some things to look at before I give up on it. Any additional thoughts would appreciated and I will keep you posted...

JohnM
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Tue, Jul 2, 2013 8:49 PM
drujinin
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Reply to JJM:
good thoughts, I appreciate the feedback. I forgot to mention that when I shut off the pony and let things sit, the oil continues to drain for several minutes. Looks like I have some things to look at before I give up on it. Any additional thoughts would appreciated and I will keep you posted...

JohnM
Possibly then it is the oil cooler.
I know when mine sprung a leak it poured and seemed to remember it continued even after shut down..........
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Wed, Jul 3, 2013 1:33 AM
JJM
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Reply to drujinin:
Possibly then it is the oil cooler.
I know when mine sprung a leak it poured and seemed to remember it continued even after shut down..........
It looks like there is hope for this old thing after all. We took off the hard nose and grill, fired up the pony to turns things over and sure enough a lot of oil comes out the front of oil cooler. The built up oily-dirt and the grill sent it in strange directions, but once everything was off and cleaned up, it was obvious. I am going to try to pull the core and have it repaired.

many thanks for the advice!
JohnM
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Sun, Jul 7, 2013 12:23 AM
Old Magnet
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Reply to JJM:
It looks like there is hope for this old thing after all. We took off the hard nose and grill, fired up the pony to turns things over and sure enough a lot of oil comes out the front of oil cooler. The built up oily-dirt and the grill sent it in strange directions, but once everything was off and cleaned up, it was obvious. I am going to try to pull the core and have it repaired.

many thanks for the advice!
JohnM
No need for the oil cooler. Cat eventually eliminated it on later models.
Just by-pass the cooler at the oil filter.
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Sun, Jul 7, 2013 12:32 AM
Rome K/G
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Reply to Old Magnet:
No need for the oil cooler. Cat eventually eliminated it on later models.
Just by-pass the cooler at the oil filter.
You can replace the water core with a full width core if yours is bad.
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Sun, Jul 7, 2013 6:33 AM
JJM
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Reply to Rome K/G:
You can replace the water core with a full width core if yours is bad.
The water core seems ok, but we shall see when things get fired up. I have been poking around the discussions about how to bypass the oil cooler core. I understand the idea of looping a fitting, but can I just plug the two outlets at the filter? Are they non-standard threads?

JohnM
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Mon, Jul 8, 2013 9:40 PM
drujinin
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Reply to JJM:
The water core seems ok, but we shall see when things get fired up. I have been poking around the discussions about how to bypass the oil cooler core. I understand the idea of looping a fitting, but can I just plug the two outlets at the filter? Are they non-standard threads?

JohnM
This was just discussed not too long ago?
D2 or D4 (RD4), it doesn't matter.
The threads are the same as the NPT per inch but they are NOT tapered!
You can get them with a straight thread.
At least one guy has used an O-ring to seal.
Bottom line is you need to remove a spring and ball that is normally in place to bypass cold oil or in the event of an oil cooler plugging off.
This is why most guys just loop them.
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Tue, Jul 9, 2013 4:28 AM
JJM
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Reply to drujinin:
This was just discussed not too long ago?
D2 or D4 (RD4), it doesn't matter.
The threads are the same as the NPT per inch but they are NOT tapered!
You can get them with a straight thread.
At least one guy has used an O-ring to seal.
Bottom line is you need to remove a spring and ball that is normally in place to bypass cold oil or in the event of an oil cooler plugging off.
This is why most guys just loop them.
I finally got things apart to take a look at the oil cooler - sure enough, quite a large leak at the bottom of the cooler radiator. The build up of oil and dirt redirected it to strange places, but taking off the hard nose and grill, etc. exposed it. So, rather than pull apart the entire radiator - I still don't know if the diesel runs - I will loop the lines and proceed from there.

again, thanks for the advice - I will let you know how this progresses...
JohnM
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Tue, Jul 16, 2013 11:16 PM
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