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Old 12-08-2021, 07:08 AM   #113
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Loss of Oil

Quote:
Originally Posted by TIFFIN34PA View Post
A friend of mine just went through the exact same problem.
It ended up being the injectors not sealing and allowing oil to be returned to the fuel tank.
Check your fuel filter and see if the fuel is darker then normal.
I know this sounds odd but he had the injectors replaced and the problem went away.
Your injectors may be able to be rebuilt.
Have to agree with Tiffin34PA. Was losing oil from my C7 Cat motor. 17 quarts in 180 miles! Engine had 28,000 miles on it at the time. No blue smoke. Turbo checked okay. No other evidence of oil leakage. Was suggested to check the fuel filter. Full of Oil. Ended up replacing all 6 injectors which solved the problem.
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Old 12-08-2021, 08:11 AM   #114
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As most of the comments and suggestions are outside the box, I'll give mine as well. Is there a possibility that you could be checking and working with the transmission fluid level as opposed to the crankcase?
Crazy, I know, but stranger things have happened.
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Old 12-08-2021, 08:45 AM   #115
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After you re-filled with the proper 24 quarts, did you start the engine before checking the dipstick? This will tell you something about whether it is an engine issue or an oil pan/dipstick issue.

As others have suggested, your head may not be draining to the pan properly. Maybe pull a valve cover bolt and see if it is filled with your mystery 7 quarts of oil.

Are you filling the tranny by mistake? My engine and tranny fill tubes are very close and look very similar.
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Old 12-08-2021, 09:46 AM   #116
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Since you measured the extracted oil from the oil pan, did you add the oil that was in the oil filter?
If you are using a LF 9009 filter they hold just shy of 2 quarts.
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Old 12-08-2021, 10:35 AM   #117
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When I was researching my C9, I called Caterpillar and asked about oil capacity. They gave me info on what to look for on the oil pan to determine capacity. Did that, then checked the dipstick to see if it was correct. All good.

If you have done that and know that - at one time - 24 quarts registered correctly on the stick and is the correct amount... Might the neighbor have tampered with the stick? Swapped it, ground off a bit, etc? Drained 7 quarts AND tampered with the stick?

Did you check the oil level after arriving at 'unhappy valley' or before departing for home?

Might be time to have a trusted friend independently verify your work. Crypto guys had a saying 'how many eyes have seen your block.'

I think I'll mark the top of my stick "Oil 02313" so I know it's mine.
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Old 12-08-2021, 10:46 AM   #118
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You do not have to "wonder" about the correct oil capacity.


Call Cummins with your engine serial number.


Cummins 800-286-6467
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Old 12-08-2021, 12:48 PM   #119
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Quote:
Originally Posted by Argosy View Post
https://www.thedieselgarage.com/thre...l-tank.108468/


You've checked everything, into the fuel tank is about the only place it can be going.
I sampled the tank, fuel looks clear.
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Old 12-08-2021, 12:55 PM   #120
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Once I start up, bags inflate I'll check it again and if none on the stick I will call. I pulled out an old invoice from 2013 when I purchased the coach. It came with full servicing and oil fill was 24 quarts and it was on the stick.
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Old 12-08-2021, 01:11 PM   #121
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Can one normally visually see a change if a couple of ounces of synthetic oil is mixed in a gallon of diesel ?
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Old 12-08-2021, 01:17 PM   #122
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Quote:
Originally Posted by Monkey Run View Post
Once I start up, bags inflate I'll check it again and if none on the stick I will call. I pulled out an old invoice from 2013 when I purchased the coach. It came with full servicing and oil fill was 24 quarts and it was on the stick.
You fill with 1.4 quarts less than I run in my ISL (same block as your ISC), but even then, 24 quarts should certainly reach the dipstick.

You can see the crosshatched section of your stick? It didn't break off and is laying in the pan?

It's been known to happen!
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Old 12-08-2021, 01:19 PM   #123
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Quote:
Originally Posted by 96 Wideglide View Post
You fill with 1.4 quarts less than I run in my ISL (same block as your ISC), but even then, 24 quarts should certainly reach the dipstick.

You can see the crosshatched section of your stick? It didn't break off and is laying in the pan?

It's been known to happen!
I'll check that, I don't recall seeing a broken end though.
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Old 12-08-2021, 01:39 PM   #124
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So the thought crossed my mind that perhaps at one time in the mh life it trashed the oil pan.
Only pan available may have been of higher
Capacity. This would of course mean your dipstick
Being the original would not register??
Just a thought. Reaching i know..
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Old 12-08-2021, 01:50 PM   #125
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Is your transmission fill near the oil fill on your coach? Any chance that oil got put into the tranny fill/dipstick? Agree with others it cant disappear, unless the dipstick is broken off, etc, or oil leaked all over the driveway




Quote:
Originally Posted by RTegarini View Post
I have no solutions but sure am curious how 24 quarts (six gallons!) of oil can just ‘disappear’. Reminds me of Harley oil change threads… after an ‘oil change’ and fill, oil doesn’t register on the dipstick. Or after a transmission fluid change, the fluid is too high. New owners drain the wrong pan or fill the wrong fill. You wouldn’t think that could happen but it sure does. Can’t wait to hear the resolution on this one. -RT
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Old 12-08-2021, 02:12 PM   #126
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This thread is like reading an Agatha Christie novel. Full of mystery and suspense, I read it everyday in hopes that we will learn the cause of "The case of the Missing Oil"
I truly am intrigued as to what the cause turns out to be!
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