Oil Leak Update

Volucris · February 27, 2009

I have an oil pan gasket leak, but I also have a leaky rear axle seal.

They have to remove the front differential to get to the oil pan gasket. What a pain for them.

Apparently I have a groove worn in the axle where the seal sets. This is only after 24,000 miles.

Pretty odd I think. A leaky oil pan is odd enough, the axle groove is really strange. I had a leaky seal on a transmission output shaft where a groove had been worn by the seal, but that was after 230,000 miles. Has anyone else heard of a problem like this? The service manager said they had a 2009 with the same problem.

Volucris

BuckFeverZ · February 27, 2009

I know early on, there were complaints of oil leaks on the NNBS pickups. At least it's under warranty.

VMax2007 · February 27, 2009

I have an oil pan gasket leak, but I also have a leaky rear axle seal.

They have to remove the front differential to get to the oil pan gasket. What a pain for them.

Apparently I have a groove worn in the axle where the seal sets. This is only after 24,000 miles.

Pretty odd I think. A leaky oil pan is odd enough, the axle groove is really strange. I had a leaky seal on a transmission output shaft where a groove had been worn by the seal, but that was after 230,000 miles. Has anyone else heard of a problem like this? The service manager said they had a 2009 with the same problem.

Volucris

Oil pan gasket huh? Wanna bet?

They told me the same thing, as well as several others on this board. Bzzzzt Wrong, try again!

I will bet your engine oil leak is either the Rear Main and/or the CPS O-ring.

Stevens03 · February 27, 2009

No issues with mine...

LAGA · February 27, 2009

After 4 trips to 2 different dealers and being told twice that there was no oil leak, I finally had my rear seal fixed last week. Odds are your leak is at the rear seal. Not a lot of oil pan leaks being posted for NBS trucks.

Darthmalo · February 27, 2009

Volucris,

Which engine does your truck have?

My truck has the 4.8 and today I noticed oil spots in my garage. I will call the dealer tomorrow.

I have an oil pan gasket leak, but I also have a leaky rear axle seal.

They have to remove the front differential to get to the oil pan gasket. What a pain for them.

Apparently I have a groove worn in the axle where the seal sets. This is only after 24,000 miles.

Pretty odd I think. A leaky oil pan is odd enough, the axle groove is really strange. I had a leaky seal on a transmission output shaft where a groove had been worn by the seal, but that was after 230,000 miles. Has anyone else heard of a problem like this? The service manager said they had a 2009 with the same problem.

Volucris

f

pm26 · February 27, 2009

The axle seals have rubber lips riding on a hardened metal surface. How can they wear a groove into the axle? Even if there was no oil lubricating the seal and the rubber hardened by overheating, I still do not see how it would wear a groove into a steel axle. You would wear out the seal and get a nasty oil leak instead.

Unless the seal rubber lip wears down to the point where the seal steel spring contacts the axle moving surface and wears a groove in it. That would be a plausible scenario, but the oil level inside the axle housing would have to be really low.

Volucris · February 27, 2009

I have the 4.8L, and the truck is a GMT 800 (2007 'Classic'). I figured getting a GMT 800 would be a good idea because by this time all the kinks would be worked out. Plus it was a lot less expensive.

I doubt it's the oilpan gasket myself. We'll see. It seems that they would know if it was the Crank Position Sensor or Main Seal since that seems to occur occasionally. Hopefull when they did into it they will know for sure. That's a lot of work to be wrong though.

As for how a groove was worn in the axle, I haven't the slightest idea. Maybe this axle missed being hardened. They are putting in a new axle. This is the second time that seal has been replaced (right rear). The first time it only had a few thousand miles on it. I've seen grooves before, but that was after 200,000 miles, not 20,000

Volucris

alaska511 · February 27, 2009

The axle seals have rubber lips riding on a hardened metal surface. How can they wear a groove into the axle? Even if there was no oil lubricating the seal and the rubber hardened by overheating, I still do not see how it would wear a groove into a steel axle. You would wear out the seal and get a nasty oil leak instead.

Unless the seal rubber lip wears down to the point where the seal steel spring contacts the axle moving surface and wears a groove in it. That would be a plausible scenario, but the oil level inside the axle housing would have to be really low.

Your're kidding, right?

That's why God invented speedi sleeves...

http://www.alliedbearings.com/mfg_prod/sea...eedi/index.html