Chevy and GMC Duramax Diesel Forum banner
  • Hey Everyone! Vote for the Site Favourite ROTM winner for the year of 2021 HERE!
1 - 20 of 20 Posts

·
Registered
Joined
·
212 Posts
Discussion Starter · #1 ·
Ive always taken pride in how clean and oil free my motor and trans are. Not a bit of seapage anywhere and it looks like a 10,000 mile motor. Although its got 190k on it.

Well I was changing the trans filters and fluid today and noticed a pretty good oil leak from the front of the engine. There are oil droplets all over the front suspention and front of the oil pan. Just a few days ago everything under there was spotless, so this has happened in the last 100 miles. My first thought being an oil leak from the lower front of the engine would be the crank seal. Its wet on both the left and right of the ballancer, but not dripping right below the the ballancer, which is throwing me off. Could there be something else leaking oil from that area of the motor? Or is it just the front main leaking?

I find it odd to have a leak like this just pop up within the last 100 miles. I use my truck for work and cant afford downtime so PLEASE help me figure this out ASAP......
 

·
Registered
Joined
·
212 Posts
Discussion Starter · #3 ·
Its nice black engine oil. Its wet from the front around the crank back. What I find odd is its not dripping straight down, mostly out to the sides?

I'll go take pics right quick.
 

·
Registered
Joined
·
212 Posts
Discussion Starter · #4 ·
pics of the leak.
 

Attachments

·
Registered
Joined
·
839 Posts
Water pump maybe?
 

·
Registered
Joined
·
212 Posts
Discussion Starter · #7 ·

·
Registered
Joined
·
212 Posts
Discussion Starter · #8 ·
Bump,

I really need some insight on this issue. I am supposed to drive nearly 600 miles tomorrow, but am sketchy with this leak....
 

·
Registered
Joined
·
712 Posts
Why not clean the oil off and also check the oil level. (Many times, when I am cleaning the oil off a potential leak, I find the source.) Then, go on the trip. Check the oil level frequently. If the leak is bad, you should see the oil level go down. If the oil level does not go down, then maybe something else is leaking (e.g. anti-freeze on top a slight oil film can look a lot like just oil, when it first happens.) Anti-freeze would suggest a water pump seal seeping.
 

·
Registered
Joined
·
212 Posts
Discussion Starter · #10 ·
Why not clean the oil off and also check the oil level. (Many times, when I am cleaning the oil off a potential leak, I find the source.) Then, go on the trip. Check the oil level frequently. If the leak is bad, you should see the oil level go down. If the oil level does not go down, then maybe something else is leaking (e.g. anti-freeze on top a slight oil film can look a lot like just oil, when it first happens.) Anti-freeze would suggest a water pump seal seeping.
Those pics are after I used a can of engine brite and cleaned it all spotless and went on a 4 mile drive. All the oil in the pics is after only 4 miles. I'm possitive its not coolant bacause I just have water and purple ice in there. No dexcool. Plus there seems to be more wetness to the passenger side of the crank, my power steering still shows full, and the power steering isnt leaking.

Did I just somehow tear the front main seal? I've never seen one start leaking from nothing to that much oil in 4 miles????
 

·
Registered
Joined
·
1,984 Posts
Looks like oil pan gasket is leaking, hitting the dampner and getting thrown up, could be my eyes though
 

·
Registered
Joined
·
839 Posts
Water pump can leak a lot of oil when the seal goes bad its worth a look
 

·
Registered
Joined
·
212 Posts
Discussion Starter · #13 ·
Water pump can leak a lot of oil when the seal goes bad its worth a look
How does the water pump have anything to do with oil? Its belt driven and just pumps water right? Or is it gear driven? I really dont know too much about the Dmax internaly.
 

·
Registered
Joined
·
6 Posts
Oil leak

I have a similar leak on the front of my 2002 Chevy Durmax. Sorry newbie here just joined. Could it be the water pump?
 

·
Administrator
Joined
·
8,815 Posts
water pump is gear driven. I would think if it was the pump you would have coolant in your oil, but I don't know for sure. It could be coming out your blowby tube on the passenger's side. I have a similar issue. Dealer needs to replace my balancer. They will change the crank seal if it is leaking once they get the balancer off.
 

·
Registered
Joined
·
2,051 Posts
The water pump is gear driven, no timing chain or belt in the Duramax. I would say it looks like the main seal or pan gasket. Also, make sure your crank vent isn't blocked. That could be causing the crank to get pressurized and that will force oil out anywhere it can go. Saw that once on a Mitsu Evo X.
 

·
Administrator
Joined
·
8,815 Posts
so where exactly is the sending unit located?


Nevermind....its close to the oil filter I think. I don't see how a sender would cause a leak by the balancer.
 

·
Registered
Joined
·
212 Posts
Discussion Starter · #19 ·
It ended up being a bad o-ring on the filler tube that was leaking out. I guess those gears really sling oil.

I replaced the o-ring when I pulled the centrifuge off and its clean since.
 

·
Registered
Joined
·
16 Posts
Where is the "CENTRIFUGE"? never heard of such an animal on a Duramax, but I am having the same type oil leak. I hope mine is just the oil filler tube seal, "O-Ring".
 
1 - 20 of 20 Posts
Top