Where is the leak? Oil Pressure Sending Unit Replacement

[treehan77]

What part did you guys get I got mine yesterday from Autozone and the sensor they gave me has one pin and mine has 3 and although plug is the same it doesn't go in the new sensor. I went back and checked with the old part number that's on the original sensor and it brings up the same sensor they gave me. Could it be delco only?

I ordered the Delco one from Amazon, it's a link earlier in this thread

 

[treehan77]

WELL CRAP that wasn't my leak. New one put in, still leaking. No i don't know if maybe i didn't tighten it enough (just snugged it with the ratchet) or what else is leaking? Clean all the oil off from up under the truck and its back after a short drive, seems to be more on the starter bolts and then leaking down, can't tell above that. before it was there and coated the oil filter etc on the other side, i'm sure thatll be coated again soon.

 

[Pachanga02]

Amazon says it doesn't fit my vehicle. @treehan77
I cleaned the top of mine off lastnight and under to see what happens I took the sensor out lastnight cleaned that and cleaned the residue going to take it for a drive and see what happens. When I was taking it out lastnight it wasn't that tight.

 

[about20ninj45]

WELL CRAP that wasn't my leak. New one put in, still leaking. No i don't know if maybe i didn't tighten it enough (just snugged it with the ratchet) or what else is leaking? Clean all the oil off from up under the truck and its back after a short drive, seems to be more on the starter bolts and then leaking down, can't tell above that. before it was there and coated the oil filter etc on the other side, i'm sure thatll be coated again soon.

Found the torq specs for this little buger

• Tighten the fitting to 15 N·m (11 lb ft).

• Increase torque until the centerline of the fitting (1) is 50 degrees from the centerline of the crankshaft (2).

 

[treehan77]

@schloe should I do valve cover gaskets next? Any chance this leak is something like the main seal?

 

[SLCHOE]

@schloe should I do valve cover gaskets next? Any chance this leak is something like the main seal?

From this picture i would not think the rear-main is the source of the oil in this pic. The oil is coming from up behind the head. Clean the uppermost part of the leak with brake cleaner or carb spray and get it nice and dry. Then use an inspection mirror on that side after you start it up and see if you can tell where it is coming from. If it wasn't the oil sending unit then yes, the next probable location would be the valve cover gasket. I'd use the mirror and check first though.

 

[SLCHOE]

Id put a socket and ratchet on those rear bolts holding that valve cover down to see if they are loose. I bet they are if it's leaking that much oil.

If they are you may get by just snugging them up but you will need new gaskets to fix it properly.

 

[treehan77]

Id put a socket and ratchet on those rear bolts holding that valve cover down to see if they are loose. I bet they are if it's leaking that much oil.

If they are you may get by just snugging them up but you will need new gaskets to fix it properly.

Haven't got a chance to tighten the valve covers yet. Read several posts claiming Crank Position Sensor leaking is also a common problem, but I can't find anything about that on this forum at all. If that were the case, wouldn't it ONLY be on the starter side, not like my pics? Several people also say it could be oil cooler lines or some block off plate ?

 

[treehan77]

Looks like we have the same leak. Changed out the valve cover gaskets and it was good for a few days. I may have to try and get this done soon I ruined my driveway with these little spots. Hopefully this is the answer to my problem and I'll be able to get my driveway sealed afterwards.

Did this stop your leak?

 

[treehan77]

couple more pics. Valve cover bolts seemed plenty tight. it sure looks like they are dry to me (everywhere i can see). the only wet thing on top i see is actually around the filler neck, it looks like its not really in there very well haha.

here's some pics, as good as i could take, the valve covers look nice and dry? btw, anyone else have problems uploading pics from phone? i always have to resize them down on my computer now since the site changed.

 

[Pachanga02]

Nope didn't stop my leak. After cleaning the engine my leak is coming from above the starter and not sure from where on the driver side. I changed the VC gasket a few months back and that didn't do it. Mine looked like yours just dirty not wet. From what I've been told it could also be the crank position sensor. I guess that'll be the next investigation. Good luck everyone

 

[SLCHOE]

Nope didn't stop my leak. After cleaning the engine my leak is coming from above the starter and not sure from where on the driver side. I changed the VC gasket a few months back and that didn't do it. Mine looked like yours just dirty not wet. From what I've been told it could also be the crank position sensor. I guess that'll be the next investigation. Good luck everyone

The crank position sensor is measuring the flywheel where there is no oil to be leaked (bellhousing).

Did you clean the residual oil from the engine/undercarriage after doing the fixes to the oil pressure sending unit and valve covers? Residual oil may still be trapped in the subframe. You need to clean out what has already been done.

There is nothing else back there that would leak oil besides a rear-main oil -seal leak .

 

[treehan77]

The crank position sensor is measuring the flywheel where there is no oil to be leaked (bellhousing).

Did you clean the residual oil from the engine/undercarriage after doing the fixes to the oil pressure sending unit and valve covers? Residual oil may still be trapped in the subframe. You need to clean out what has already been done.

There is nothing else back there that would leak oil besides a rear-main oil -seal leak .

I cleaned the oil up as best I could. It doesn't leak or drip just sitting in the driveway, but a drop of oil will form on the inside starter bolt after a couple minutes of idling with me under there, so I don't think it's residual

 

[Pachanga02]

I think Travis and I have the same leak.

 

[treehan77]

I think Travis and I have the same leak.

I think my next step is to remove the starter and see if, in fact, the CPS is leaking due to a worm o-ring, even though SCHLOE says t can't. Only cheap/free thing I haven't tried. I mean, if it's not that, what could it be other than somehow the oil pan or rear seal? I guess it's possibly the CAMSHAFT position sensor ?

 

[SLCHOE]

I think my next step is to remove the starter and see if, in fact, the CPS is leaking due to a worm o-ring, even though SCHLOE says t can't. Only cheap/free thing I haven't tried. I mean, if it's not that, what could it be other than somehow the oil pan or rear seal? I guess it's possibly the CAMSHAFT position sensor ?

For some reason I was thinking of a different CKP sensor. These do in-fact pass through the block to measure a reluctor wheel on the rear of the crankshaft so it may indeed be your oil leak. Sorry about the confusion.

 

[Pachanga02]

Just went under my truck and saw where the leak on the driver side is coming from, above the filter where the 2 lines come in either that or the side gold looking circle. Either way it's the same piece.

 

[treehan77]

Just went under my truck and saw where the leak on the driver side is coming from, above the filter where the 2 lines come in either that or the side gold looking circle. Either way it's the same piece.

 

[treehan77]

So yours is the oil cooler you mean? Mine doesn't have and doesn't appear to leak from the block off but I'll double check

 

[Pachanga02]

this is where my leak is coming from, i had to get to my computer to upload pics. It's either from this point or my oil pan gasket dripping down to this.