Duramax Diesels Forum Truck of the Week
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Old 08-22-2019, 09:11 AM
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Default Oil leak

Hey guys seems to be problem after problem with my truck but i guess thats how it is lol. But this time it is an oil leak coming from from the front driver side of the truck. I was driving the truck yesterday and got a “check oil pressure” light on the dash and the guage was reading 0 oil pressure didnt think much of it as my oil guage has been faulty since i bought the truck. Walked outside to leave work and there was a puddle of oil (looked about less then a quart). Decided to drive her the 3 miles back home where i found drops of oil following the truck. Any ideas? Im hoping i dont have to build the engine just yet lol.
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Old 08-22-2019, 09:21 AM
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On the LB7, there is a PCV vent on the right front of the engine (open pipe next to the balancer). Too much blow by and you may get oil coming from the drain.
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Old 08-22-2019, 10:08 AM
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Quote:
Originally Posted by BlkMax View Post
On the LB7, there is a PCV vent on the right front of the engine (open pipe next to the balancer). Too much blow by and you may get oil coming from the drain.
I havent seen any blow by coming from the truck infact i just went out to check. It also seems as tho its been leaking over night but a little puddle not a ton
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2001 LB7
Name: Patricia
ECSB
4 inch MBRP straight pipe
suncoast built trans
efi live by Pela Motorsports
Airdog2 4g 165
Exergy stock replacement injectors
ARP head studs
Stealth 64 G2
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Old 08-22-2019, 10:22 AM
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front driver could be power steering, water pump o-ring died, front main seal, oil pressure sensor blew apart (most likely the issue if your gauge is dead, 01-02 clusters don't loose the gauges like 03-07) or some gasket pushed out.

driving the damn thing while it shows no oil pressure is a hell of a risky move.
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Old 08-22-2019, 10:52 AM
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Quote:
Originally Posted by Chevy1925 View Post
front driver could be power steering, water pump o-ring died, front main seal, oil pressure sensor blew apart (most likely the issue if your gauge is dead, 01-02 clusters don't loose the gauges like 03-07) or some gasket pushed out.

driving the damn thing while it shows no oil pressure is a hell of a risky move.
Risk is the name of the game hahaha. But i was looking inyo it and was thinking it could possibly be the oil pressure sensor. Im gonna try to send a picture of what it looks like right now
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2001 LB7
Name: Patricia
ECSB
4 inch MBRP straight pipe
suncoast built trans
efi live by Pela Motorsports
Airdog2 4g 165
Exergy stock replacement injectors
ARP head studs
Stealth 64 G2
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Old 08-22-2019, 10:55 AM
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t


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2001 LB7
Name: Patricia
ECSB
4 inch MBRP straight pipe
suncoast built trans
efi live by Pela Motorsports
Airdog2 4g 165
Exergy stock replacement injectors
ARP head studs
Stealth 64 G2
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Old 08-22-2019, 11:25 AM
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i can see part of the sensor in your last pic, looks pretty wet with oil.
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Mike L is my role model. I want to be like him when I grow up.
James

02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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Old 08-23-2019, 10:30 AM
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What about an oil pressure sender? I keep seeing it pop up on forums of people that have the same problem that im having but when i go to look up an “oil pressure sender” i cant find anything just an oil pressure sensor. But it seems they are two different parts the senor toward the back and the sender toward the front. Anyone know anthinf about this?
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2001 LB7
Name: Patricia
ECSB
4 inch MBRP straight pipe
suncoast built trans
efi live by Pela Motorsports
Airdog2 4g 165
Exergy stock replacement injectors
ARP head studs
Stealth 64 G2
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  #9  
Old 08-23-2019, 12:56 PM
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Quote:
Originally Posted by Kuzz View Post
What about an oil pressure sender? I keep seeing it pop up on forums of people that have the same problem that im having but when i go to look up an “oil pressure sender” i cant find anything just an oil pressure sensor. But it seems they are two different parts the senor toward the back and the sender toward the front. Anyone know anthinf about this?
your sensor/sender is at the front off the #1 main. 03-up is off the #3 main.

sender and sensor are being used as the same thing in the research you are doing
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Quote:
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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  #10  
Old 08-24-2019, 08:36 AM
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Quote:
Originally Posted by Chevy1925 View Post
your sensor/sender is at the front off the #1 main. 03-up is off the #3 main.

sender and sensor are being used as the same thing in the research you are doing
Thank you for the info! Im gonna try to tackle it tomorrow and figure it out. Ill keep you guys informed.
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2001 LB7
Name: Patricia
ECSB
4 inch MBRP straight pipe
suncoast built trans
efi live by Pela Motorsports
Airdog2 4g 165
Exergy stock replacement injectors
ARP head studs
Stealth 64 G2
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  #11  
Old 08-24-2019, 12:00 PM
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Default Oil leak

So i did some looking around and think i found the problem. There doesnt seem to be oil leaking from above this spot, i just need confirmation that this is the oil pressure sensor (to the left of the pitman arm in the second pic). Also there seems to be a lighter ring around my oil, it could have just dried but wanna be for sure so let me know what you guys think


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2001 LB7
Name: Patricia
ECSB
4 inch MBRP straight pipe
suncoast built trans
efi live by Pela Motorsports
Airdog2 4g 165
Exergy stock replacement injectors
ARP head studs
Stealth 64 G2
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  #12  
Old 08-24-2019, 02:26 PM
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Yes, thats the oil pressure sensor. Yes, its leaking. Had the exact same sensor on my Aurora go bad. Sometimes the black bodies will crack.
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Old 08-24-2019, 02:48 PM
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Looks like you have fuel in your oil
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Old 08-26-2019, 01:59 PM
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Well i thought it was fixed. But after a day of driving noticed the oil pressure
Is low at idle (probably 10-12 psi) when I accelerate is goes up but think its wierd because it use to be at 40+ psi at idle. Truck runs fine just dont know what it can be. Only think i can think of is the oil pressure guage switch isnt fully tightned because if how difficult it was to fit a wrench in there. Any thoughts?
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2001 LB7
Name: Patricia
ECSB
4 inch MBRP straight pipe
suncoast built trans
efi live by Pela Motorsports
Airdog2 4g 165
Exergy stock replacement injectors
ARP head studs
Stealth 64 G2
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  #15  
Old 08-26-2019, 02:06 PM
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Looks like it is fine. You will need to read the oil pressure pid to really see the actual pressure and not what the dash says

40+ at idle hot is uncommon so it was likely wrong
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