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Oil leak in back of motor

Generation III Internal Engine 1997-2006 LS1 | LS6

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Oil leak in back of motor

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Old

Jul 31, 2021 | 12:57 PM

#1

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Teching In

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Oil leak in back of motor

I have an 06' Sierra with the aluminum block 5.3. I have a pretty bad oil leak on the top, rear of the motor and it leaks down to the bellhousing. So far I've replaced my rear main, valley cover gasket, oil pan gasket knock sensors, cam sensor and oil pressure sensor. I don't know what else could be leaking. If anyone else has any idea on what it could be I'd really appreciate it. Thanks

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Jul 31, 2021 | 01:26 PM

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From: Central Cal.

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Check any PCV line running across there for cracks or seepage.

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Jul 31, 2021 | 01:38 PM

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Quote:

Originally Posted by G Atsma

Check any PCV line running across there for cracks or seepage.

I will check again. But I replaced the driver's side PCV with rubber hose. my port for the passenger side is broken on my intake. Currently I have a breather tube on the front of my pass. side valve cover

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Aug 2, 2021 | 10:36 PM

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From: Killeen TX

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Quote:

Originally Posted by D_himmberger

I will check again. But I replaced the driver's side PCV with rubber hose. my port for the passenger side is broken on my intake. Currently I have a breather tube on the front of my pass. side valve cover

Oil pressure sender may be bad and leaking.

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