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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

90wt smell

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Old 04-17-2014, 03:02 PM
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90wt smell

Im getting an occasional wiff of 90 wt inside the cab. Usually when stopping. I dont see any leaks on the diffs and ghe rims are oil free.

Any ideas?
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Old 04-17-2014, 06:17 PM
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Just to clarify, you say it smells like gear oil?
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Old 04-17-2014, 07:15 PM
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Yes gear oil. I don't know what it could be.
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Old 04-17-2014, 08:21 PM
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Quote:
Originally Posted by sv250 View Post
Yes gear oil. I don't know what it could be.
Could be burning brakes, it's an acrid smell that isn't that dissimilar from gear oil. Have you checked for a sticking caliper?
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Old 04-17-2014, 08:48 PM
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I just rotated the tires and checked the brakes. Pads and rotors look good. If it was sticking shouldn't I see some chattering othe rotor?
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Old 04-17-2014, 09:08 PM
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I've had a similar issue with my 06. It was the rear axles seals leaking. They leak ever so slightly and it seeps into the park brake assembly on the inside of the rear rotors. The heavier load you pull, the stronger the smell. There were no drops onto the ground, just a very small streak on the rear hub.
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Old 04-18-2014, 07:12 PM
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Ill have to pull the rotors and check that out. I only get this smell once in a while then only for a few seconds.

I have been running in 4 hi in the rain since my "limited slip" sucks ***. I dont go over 65 in 4wd. I hope that hasnt caused a leak.

Im also runni g an h and s tuner. Ive only made 3 passes in the truck so i wouldnt think the pinoon seals would be slowly leaking. That and i dont see any fliid.

This started about 1k miles ago after my last oil change and rotate.
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Old 04-18-2014, 08:34 PM
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I have been running in 4 hi in the rain since my "limited slip" sucks ***. I dont go over 65 in 4wd. I hope that hasnt caused a leak.
That would not cause a leak. Some folks up north spend half the year in 4WD and they don't leak. Not sure why you'd need 4WD in the rain though.
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Old 04-18-2014, 09:44 PM
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One bald tire spins if i just tap the gas. I go no where. Bigger meats coming soon
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Old 04-19-2014, 04:28 AM
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Do you have the CCV reroute ?
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Old 04-19-2014, 04:52 AM
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Yes i do. Its def a gear oil smell though.
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Old 04-19-2014, 12:46 PM
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Quote:
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Yes i do. Its def a gear oil smell though.
Thats what it is, mine smells the same way.
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Old 04-19-2014, 04:40 PM
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Ok well thats a relief. I guess ill need to route it further out or add some sort of filter.
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Old 04-21-2014, 07:05 PM
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Check the left frame rail roughly under the driver's seat, the front axle breather is located up there (follow the hose to the diff), and if you've been running in 4WD on moderate traction roads you may well have overheated the front diff and caused some oil to puke out of the breather.

These trucks are 4WD, not AWD and do not have a center differential so unless the road is *really* slippery things will bind up and overheat. I cooked my front diff driving an extended distance in 4HI in *6" of slush* on the highway, and slush is far lower traction than rain.
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Old 04-23-2014, 06:15 PM
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Quote:
Originally Posted by Canelo Elizondo View Post
I agree here. You should not experience a leak.

Regards
Rod
DPF Delete
It is not a leak, it is overheating the front axle which cause some of the gear lube to puke out of the axle vent tube which is routed up into the left frame rail as I noted. I'd put 95% odds that this is what is happening to the OP, and it will ultimately result in a rebuild of the front axle if he continues using 4WD on high traction surfaces at speed.
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