Where is the leak? Oil Pressure Sending Unit Replacement

[#1taho]

Any updates? My update is after cleaning around the sensors and all around the engine I think it comes down to the oil pan gasket. I've run out of time and leave for Florida on Saturday so I'll get back to it and swap that out when I return in 2 weeks. After that I'll post back hopefully my solution and last complaint about my leak. Fingers crossed.

That's the same as I found. I haven't fixed mine yet. But I have some time before I install the 6.0. Just ordered the parts to get it installed.

 

[treehan77]

Any updates? My update is after cleaning around the sensors and all around the engine I think it comes down to the oil pan gasket. I've run out of time and leave for Florida on Saturday so I'll get back to it and swap that out when I return in 2 weeks. After that I'll post back hopefully my solution and last complaint about my leak. Fingers crossed.

Not yet I was gonna try to look and see if the cam position sensor looked oily tomorrow. When I did the oil pressure switch, I didn't notice a bunch of grime in that area. The dealer actually replaced oil pan before I bought the truck, maybe they did a ****** job and it's already leaking again, 1 year later. Still weird it seems like it's above that, but that's really my only other possibility. Other than main seal, flywheel is dry though

 

[Pachanga02]

Yesterday I took the covers off the bell housing and flywheel was dry a tiny bit of oil/grime on the bottom but nothing crazy. Top of engine looks nice and clean bottom is another story.

 

[Murder n Mayhem]

Thanks for that info Scloe may come in handy. I have one that started down there recently too. No noticeable loss when check oil & gauge fine. Had hoped was loose filter but no luck. Read couple places about a common problem with a plate above there, still diagnosing.

 

[wesyder]

I am currently battling a leak myself, my 05 denali has over 260k on it, I've done the pan gasket (again), cam and crank trigger, oil sender, vc gaskets, valley plate gasket and still leaking, truck was just repainted so now i will be tackling the rear main seal and cover gasket as soon as the seal installer arrives


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[treehan77]

haven't had much time to investigate anything else. wiped it all clean again and shoved a shop towel in between the starter bolt and bellhousing where it is definitely leaking. hopefully this will help narrow it down, by stopping the oil there and not blowing all over the place after leaking down below. like i said before, the inside starter bolt collects some oil while i'm watching, nowhere else is visible. so if my rag is oily after i remove it after driving around some, and nowhere else, i'll at least know i'll have to take the starter out and look at the crank position sensor. still need to try and see if i can see the camshaft position sensor leaking possibly if thats not it. whatever it is, its definitely waaay in the back...maybe my rag is the solution for now haha if it doesn't drip it may have to be for a while.

 

[treehan77]

With rag shoved up under starter I drive around. Rag Bone dry? Wth? Bottom of pan has oil again. Soooo this time it seems to have come down the other side. Befuddled since when I'm under it it only shows oil on the inside starter bolt.

 

[treehan77]

Throwing in the towel-it's going to the dealer Friday. I hope they don't tell me it's the main or something major. I kind of hope they say it's the oil pan-since they fixed that less than 6000 miles ago. That'll piss me off if it "went bad" that quick.

 

[Pachanga02]

I'm going to replace my oil pan gasket but I think I'll wait a little bit. Looking to see if there is anything else that needs to or should be replaced like the oil pump when changing the gasket. Good luck and make sure to report back.

 

[treehan77]

I'm going to replace my oil pan gasket but I think I'll wait a little bit. Looking to see if there is anything else that needs to or should be replaced like the oil pump when changing the gasket. Good luck and make sure to report back.

Yeah if they say oil pan again and they won't help me out at all since they JUST changed it out, I'll do it myself and change the boring or whatever on the pick up while I'm in there.

 

[treehan77]

Dealer says the rear main seal is the culprit after all. Showed me in the rack. Guess it'll leak until I get rid of it or need a new transmission or I find a cheap mechanic to do it. Oil pan gasket is leakin slightly also. Quote was 1100 bucks to do both.

 

[SLCHOE]

Dealer says the rear main seal is the culprit after all. Showed me in the rack. Guess it'll leak until I get rid of it or need a new transmission or I find a cheap mechanic to do it. Oil pan gasket is leakin slightly also. Quote was 1100 bucks to do both.

2WD or 4WD? For 4WD that's not a bad price. For 2WD the estimate should be about $900.

 

[treehan77]

2WD or 4WD? For 4WD that's not a bad price. For 2WD the estimate should be about $900.

2Wd that includes redoing oil pan

 

[SLCHOE]

It's not bad but the rear main is a 5.9 hr job for the 4L60E (5.3L) and 5.2 hours for the 4L80E (6.0L).

Oil pan shows 2.0 hours so about 8 hours total in just labor. At an average $100/hr that's 800. A rear main seal kit and oil pan gasket/oil should be about $100-125 customer price.

$925. Is what most shops would do it for around here (before tax as your quote would be also). I'd shop around. Or get them to do a full synthetic oil change or 3.

 

[treehan77]

It's not bad but the rear main is a 5.9 hr job for the 4L60E (5.3L) and 5.2 hours for the 4L80E (6.0L).

Oil pan shows 2.0 hours so about 8 hours total in just labor. At an average $100/hr that's 800. A rear main seal kit and oil pan gasket/oil should be about $100-125 customer price.

$925. Is what most shops would do it for around here (before tax as your quote would be also). I'd shop around. Or get them to do a full synthetic oil change or 3.

Yep. Gonna live with it for while. I figure I'll need a tranny at some point anyway. Or until I find a mechanic I trust on the side.

 

[SLCHOE]

If you haven't already switch to high mileage (synthetic blend) or full on synthetic. It may swell your rear main a bit to lessen the leak.

 

[SLCHOE]

To be honest, since your truck ie 2WD, that 6.0 hour labor time is time to remove, replace the seal and install. If you have some basic tools and a jack and jackstands, you could easily do it yourself. There's nothing much to it. I can have one out on the floor in 1 hour in the shop so i figure 2 hours on the ground. Get a buddy or two to help you do it and it's done on a few hours.

The seal itself is under $20.

 

[treehan77]

To be honest, since your truck ie 2WD, that 6.0 hour labor time is time to remove, replace the seal and install. If you have some basic tools and a jack and jackstands, you could easily do it yourself. There's nothing much to it. I can have one out on the floor in 1 hour in the shop so i figure 2 hours on the ground. Get a buddy or two to help you do it and it's done on a few hours.

The seal itself is under $20.

It'll take me two hours to get under the truck and 2 more to get a helper.

 

[SLCHOE]

LOL.

 

[treehan77]

Does this look like a camshaft position sensor leak? Valley? I’ve changed the oil pressure switch. Am I crazy or what... I don’t think the rear main is the culprit here...looks like a lot of oil to me way up here.

Thoughts?