Major oil leak in one spot

Tiny
NATHAN LAMERE
  • MEMBER
  • 2011 KIA SEDONA
  • 3.5L
  • V6
  • FWD
  • 80,000 MILES
The van constantly drips oil when not running from bottom of engine and transmission were they bolt up.
when I am driving it is leaking oil at a lot faster flow, and reason I say more is because under the van is soaked with oil from front to back of van. So I decided to put a little more torque on bolts holding transmission to motor. That did not work. Please tell me why it is doing that in first place. And hopefully I can fix it my self cheaper. Thank you
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Saturday, August 30th, 2014 AT 11:01 AM

3 Replies

Tiny
CARADIODOC
  • EXPERT
Those transmission-to-engine bolts do not seal in any oil. In fact, there are holes in the bottom specifically so any leaking engine oil or transmission fluid will run out and not back up inside there. The most common cause of an oil leak from there is the rear main seal, but they usually do not leak that fast. In this case it is more likely something up above that area is leaking and running down. Oil is not going to leak from the engine when it is not running, unless the oil pan is rusted through. If you are seeing drips long after the engine has been stopped. That is due to the oil pooling somewhere and slowly sneaking through a small opening to run out. Look for the highest place you see oil in that area. For oil to leak really quickly, common causes are the oil pressure sending unit and a threaded or pressed-in plug in the engine block or cylinder head.

Also, look at the valve cover gaskets. Oil can leak from them real fast too but slow leakage is more common. If regular maintenance schedules have not been followed, it is possible for the oil drain-back holes in a cylinder head to be partially blocked with sludge. That will cause the oil to accumulate up there. That will turn a small valve cover leak into a big mess.
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Saturday, August 30th, 2014 AT 11:00 PM
Tiny
CDFARRAR
  • MEMBER
I am experiencing the same problem as you right now but I think I have the solution. On the bottom of the transmission where it bolts to the engine there is a weep hole. The oil is coming out that hole. The oil is actually coming out through the oil pressure switch which is located between the are inlets at under the air intake manifold. The oil runs along the v of the engine and goes through a weep hole between the engine and transmission bell housing. It runs to the bottom of the housing and out the weep hole where it becomes visible. To get to the pressured switch you have to take off the plastic ducting at the top of the engine, the fuel delivery manifold, and then the air intake manifold. The sending unit is on the left of the engine at the bottom of the v between the cylinder heads. Replace it and you are golden. I proved that this is the issue with mine when I stuck a straw down a narrow passage that lets me see the unit and brought it back up covered in fresh oil.
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Sunday, November 15th, 2015 AT 3:49 PM
Tiny
CARADIODOC
  • EXPERT
Thanks for the information. We have not heard back in over a year so maybe they solved this already.
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Monday, November 16th, 2015 AT 9:45 AM

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