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Old 03-20-2017, 11:30 AM   #1
silvrhand
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Well expensive weekend for me..

- car oil pressure dropped
- oil temp started to rise..
- and rod started knocking..

Oil looks like graphite.. joy.. Car was 2 quarts low on oil, and I don't have a leak looking for suggestions on where the oil went.. underneath the car is clean as a whistle..

- John
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Old 03-20-2017, 11:38 AM   #2
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damn.. sorry to hear man.... is there oil in intake, TB etc?

If its not leaking then in theory it was eating it right?... ( or was low period during a change obviously)
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Old 03-20-2017, 12:03 PM   #3
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More information needed. What were you doing just prior? Recent oil change? Miles on car? Year model? Mods?
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Old 03-20-2017, 12:15 PM   #4
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If not leaking oil and level was correct, then it had to have been ingesting it, rings or valve guides. Where you seeing any blue smoke on first start or while running?
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Old 03-20-2017, 12:16 PM   #5
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Quote:
Originally Posted by Durien512 View Post
damn.. sorry to hear man.... is there oil in intake, TB etc?

If its not leaking then in theory it was eating it right?... ( or was low period during a change obviously)
yah it was either low on change, or when I pull it apart I'm going to find massive leakage somewhere internally past the valve guides or something else.
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Old 03-20-2017, 04:12 PM   #6
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Is the car an '09+ with 10.5 qt dry sump?
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Old 03-20-2017, 04:47 PM   #7
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More going on here than 2 qts down in the dry sump whether 8 or 10.5 qt capacity unless the car was on a track at 6-7,000 RPM. Even 2 qts down on a 8qt Z, just driving down the road would not spin a bearing causing the rod knock. The engine would have to be close to out of oil for the low oil to fry the engine.
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Old 03-20-2017, 04:57 PM   #8
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Bummer;
If an oil pump dies it can pull from tank but not scavenge back to tank, oil can be in sump. It will hold the entire tank. Pull sump drain plug with a clean big container.
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Old 03-20-2017, 06:16 PM   #9
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Quote:
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Bummer;
If an oil pump dies it can pull from tank but not scavenge back to tank, oil can be in sump. It will hold the entire tank. Pull sump drain plug with a clean big container.
This suggestion seems very plausible...oil pump died....especially with dropping oil pressure and then rod knock.....
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Old 03-21-2017, 09:44 PM   #10
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When's the last time you checked the oil level? 2 quarts would not be unheard of on these cars if you were toward the end of a change interval and beat on it a lot. I agree though that it doesn't seem like even 2 quarts low on your car would matter unless you had sustained g load.
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Old 03-22-2017, 09:33 AM   #11
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this is impossible ls7's only die from dropped valves
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Old 03-22-2017, 10:01 AM   #12
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Yup, sounds like you lost a pump. Sorry for your loss.
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Old Yesterday, 09:38 AM   #13
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Some progress..

- measure the amount of oil drained out of the car.. 4 quarts, this was after I put 3 quarts in it when the rod started knocking.
- oil is like graphite, and has sparkles in it.
- top of engine is good had oil covering the heads..
- pistons look good other than #2 you can twist it in the cylinder right now, rod bearing looks gone.



oil should not be sparkly





















oil is more like graphite..
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Old Yesterday, 11:23 AM   #14
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Quote:
Originally Posted by njk4o5 View Post
this is impossible ls7's only die from dropped valves
Funny comment, not a funny scenario hopefully that it's something simple but it sounds like a motor build. This is your excuse to build a stout motor?
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Old Yesterday, 01:49 PM   #15
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Well at least you're not buying a complete different long block, so it could have been a lot worse..
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Old Yesterday, 08:42 PM   #16
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damn. So essentially you are saying the motor had 1 quart of oil in it?!
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Old Yesterday, 10:45 PM   #17
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Still don't know what caused the rod bearing failure but it's pretty obvious it failed, luckily I just dumped the clutch and pulled over and killed the motor before it got much worse...






















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Old Yesterday, 10:49 PM   #18
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Wow, that was hammered! By using your head you saved yourself a major heartache. Well done, and good luck putting it back together.
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