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Old 12-30-2007, 11:31 PM   #1 (permalink)
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5.3L Leaking Oil

2001 Chevy Silverado, 5.3L 4x4. This is the DD. Oil leak appeared a few weeks ago and started spotting the driveway. There was a service bulletin for an o-ring on the oil pump pickup tube so obviously the pan got a new gasket (what was originally suspected as leaking). The pan did have oil before the hump so I'm guessing there was a leaky gasket. After changing the pan gasket though it still has a sloooow oil leak.

Oil gets on the bellhousing, but not inside it so doesnt seem to be a rear main. Oil does however get on the starter bolt closest to the block. Anybody familiar with this engine have an idea as to what this could be? Any known oil leaks that show up after 100k? Any help would be much appreciated as I'm still on the hunt to figure out what this could be.
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Old 12-31-2007, 06:35 AM   #2 (permalink)
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If the oil is getting oin the outside of the b/h it can be the valve cover gaskets or the oil sending uniy that is on the back of the block next to the intake or possably be the the intake gasket between the intake and the block .
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Old 12-31-2007, 06:56 AM   #3 (permalink)
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X2

I have a 5.7 and it has the same symptoms. It doesn't leak much so I leave it alone. It's been doing it for a few months now.
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Old 12-31-2007, 07:03 AM   #4 (permalink)
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Quote:
Originally Posted by suckcreekoffroad View Post
If the oil is getting oin the outside of the b/h it can be the valve cover gaskets or the oil sending uniy that is on the back of the block next to the intake or possably be the the intake gasket between the intake and the block .
Thats would my guess would have to be also.
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Old 12-31-2007, 07:40 AM   #5 (permalink)
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The 5.3 does not have oil below the intake like a 5.7. Also it is not your valve covers they are sealed up very well on this motor. I would look at the oil pressure sending unit, there is also a crank sensor right behind the starter. If the o-ring on that has hardened up I could see that leaking oil. Best thing to do is get some engine oil dye and a black light. Honestly I have never seen one with a oil leak, however I own 2 5.3's and a 6.0 and they all leak coolant Gm will pay for using that dexcool shit someday.
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Old 12-31-2007, 10:39 AM   #6 (permalink)
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Check the oil cooler adapter as well. if you have one its above the oil filter. The pan could leak if not torque correctly as well. And it could be the rear engine cover.
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Old 12-31-2007, 02:46 PM   #7 (permalink)
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Yea I know about the possibility of a pan leak but I"m sure it's not. Plus the starter bolts are horizontal from the pan almost an inch away and they're gettin oil on them. I was figuring on there being something higher up that could cause the leak. Appreciate the help I'll get it up and look at it.
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Old 12-31-2007, 07:45 PM   #8 (permalink)
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maybe its thinking like a harley, and marking its place.

this might sound environmentally unfriendly, but have you ever seen ANY 55-99 sbc NOT leaking oil?

its only a matter of time till it does, you know. you cant hermetically seal everything.
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Old 12-31-2007, 08:01 PM   #9 (permalink)
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dipstick tube? the tube is held in with one bolt in the head and has an o-ring in the bottom...placement is close to where all this is that you are talking about.
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Old 01-03-2008, 08:14 PM   #10 (permalink)
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Originally Posted by Big-B View Post
The 5.3 does not have oil below the intake like a 5.7. Also it is not your valve covers they are sealed up very well on this motor. I would look at the oil pressure sending unit, there is also a crank sensor right behind the starter. If the o-ring on that has hardened up I could see that leaking oil. Best thing to do is get some engine oil dye and a black light. Honestly I have never seen one with a oil leak, however I own 2 5.3's and a 6.0 and they all leak coolant Gm will pay for using that dexcool shit someday.
Definitely check the oil pressure sending unit switch. Ive got a 2000 5.3 with 140,000 miles and ive had 2 to blow out. They start out slow at first then mine have gushed all at once. Kind of a pain in the ass to get to. best way ive found is to pull off the plastic cover on top of the intake and about half way between the center line of the motor and the drivers side, almost like your laying your hand down the firewall, the oil pressure switch will stick up, with wires plugged in on top, off the block about 6-8 inches down below the back of the intake. bout have to just feel around. feel around the threads and if it is it leaking, should be oil there. if its leaking, i think the socket is like a 1 1/16 or a 27 mm. had to get a DEEP well socket at parts house. good luck
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Old 09-17-2014, 12:33 PM   #11 (permalink)
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Did you ever find the oil leak because my 2001 truck is doing the same thing
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Old 09-17-2014, 03:20 PM   #12 (permalink)
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If you don't have the dye...clean the engine real well. Then drive it short distance and check for leaks. If none keep driving until it does leak. By checking it I mean a bright light and a mirror ..You will find the leak
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