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Old 08-03-2015, 09:35 PM   #1
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I changed generator oil and now it leaks

Generator with 278 hours has been running great. It was time to change oil and swap in a new filter. Took on an overnight with about 12 hours of runtime. Noticed when I got home the bottom floor of generator was covered in oil. Perhaps half a cup's worth. No telling how much was kicked out the back by the cooling fan. Never leaked before.

Only thing is the oil on the dipstick is not low afterwards.

I'm wondering if I overfilled it. Was trying to be careful. Generator still runs fine. No white aerated oil.

Suppose I overfilled it? Will it get better with time? Or do I take the dive and have someone look at it?
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Old 08-03-2015, 09:45 PM   #2
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Where is the oil level now? If it's in the "safe" range, I'd suggest cleaning all the leaked oil off it and running it some more. If the leak stops, then I'd say you overfilled it. If it still leaks, you'd better have someone look at it.
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Old 08-03-2015, 09:47 PM   #3
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Check it out by all means.
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Old 08-03-2015, 09:51 PM   #4
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Did you put in the exact amount of oil , stated in the owners manual, for an oil & filter change? As with the main engine in your coach , gen set oil shouldn't be checked; or added; till the engine has been shut down for an hour.
I would be tempted to do a complete clean up and run the gen set for a couple of hours to re-check for leaks.


EDIT: And as always , other members type faster than I do.
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Old 08-04-2015, 07:20 PM   #5
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If it were me, I would drain it and start over with a new filter and oil. Make sure the old rubber seal did not stick to the mounting surface. The oil will leak between the two seals. This way you know you are golden.
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Old 08-04-2015, 07:29 PM   #6
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Did you put in the exact amount of oil , stated in the owners manual, for an oil & filter change? As with the main engine in your coach , gen set oil shouldn't be checked; or added; till the engine has been shut down for an hour.
I would be tempted to do a complete clean up and run the gen set for a couple of hours to re-check for leaks.


EDIT: And as always , other members type faster than I do.
Good advice by Skip426, before you drain an reinvent the wheel, run it and check for leaks.
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Old 08-05-2015, 04:22 AM   #7
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If the gasket from the old oil filter stayed on the engine, you now have 2 gaskets and one of them might have rolled to the side and is leaking. Can you check your old filter and see if the gasket is still attached?
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Old 08-05-2015, 04:37 AM   #8
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Clean up the area, leave the front cover off and fire it up. Sit there and see if you can see where it is coming from with it running. Ours occasionally will leak out of the rubber drain tube. Not to the extent that you mentioned but some does drip on the generator frame floor. If the oil level is at the full mark as you mention, my guess is that you had it overfilled. Good luck hope you get it resolved.
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Old 08-05-2015, 06:55 AM   #9
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It seems the leak is coming from under the generator. Talked to a Coachnet tech on the phone & he said this model, Guardian 7500, has a tendency to leak at the oil cooler. So I will give it time and if it continues then I will pull it out to check those lines.
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Old 08-05-2015, 02:30 PM   #10
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It seems the leak is coming from under the generator. Talked to a Coachnet tech on the phone & he said this model, Guardian 7500, has a tendency to leak at the oil cooler. So I will give it time and if it continues then I will pull it out to check those lines.
The generator didnt leak before you changed the oil.


Check the oil filter, thats where its leaking
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Old 08-05-2015, 04:15 PM   #11
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Quote:
Originally Posted by TexasTom View Post
Generator with 278 hours has been running great. It was time to change oil and swap in a new filter. Took on an overnight with about 12 hours of runtime. Noticed when I got home the bottom floor of generator was covered in oil. Perhaps half a cup's worth. No telling how much was kicked out the back by the cooling fan. Never leaked before.

Only thing is the oil on the dipstick is not low afterwards.

I'm wondering if I overfilled it. Was trying to be careful. Generator still runs fine. No white aerated oil.

Suppose I overfilled it? Will it get better with time? Or do I take the dive and have someone look at it?

How much oil did you put in it?
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Old 08-06-2015, 08:07 AM   #12
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I wish it was leaking at the oil filter, that would be an easy fix.

I put maybe 1.5 Qt. in, and it has a 2 Qt. capacity.
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Old 08-06-2015, 10:08 AM   #13
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Change the filter, see if it stops leaking.
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Old 08-06-2015, 01:04 PM   #14
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Worth a try!
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