Rear main seal leak - Ford Powerstroke Diesel Forum
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Old 02-23-2008, 04:38 PM
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Rear main seal leak

I have the usual wet bell housing and rear block. Is this usually the rear main seal? Do they have to pull the motor?
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Old 02-23-2008, 05:03 PM
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It is likely the bed plate seal. I had the same problem and a friend at work is having it now.
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Old 02-23-2008, 05:24 PM
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Usually NOT the rear main...
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Old 02-23-2008, 05:34 PM
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It may be the ICP sensor or the IPR.
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Old 02-23-2008, 05:51 PM
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on an 06 model, its not likely none of the previous suggestions, alot of oil leaks on 6.0 are diagnosed incorrectly, on a 06 model, i would think more along the lines of two things , cam sensor o-rings , or rear engine cover leaking , if it is the rear engine cover , the trans has to come out and rear main replaced either way , there is one thing that is gauranteed , the 6.0 will always have a slight film of oil on the bottom of the bellhousing , thats a given , the bedplate, rear main and icp sensor leak were for the most part on 03 and early production 04 in my opinion like said before , alot of leaks are misdiagnosed on these engines
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Old 02-23-2008, 06:13 PM
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It has always had a drop on the bellhousing. Never any on the ground until recently. It is now dripping from the bellhousing as well as both sides of the engine block.
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Old 02-23-2008, 11:48 PM
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I have read that the most common leaks on the 6.0 are as follows in descending order of occurrence: (Notice the First four items comprise 65% of all reported leaks and are a simple fix.):

Oil leak - Ford Truck Enthusiasts Forums

See post #5

CAC Tubes = 21%
ICP Sensor = 16%
Glow Plug Harness = 14%
Cam/Crank Position Sensor =14%
Front Crankshaft Seal = 8%
Upper to lower block seal (skirt) = 5%
HPOP cover = 4%
Oil Cooler (this leaks into engine coolant) = 4%
Front or Rear Engine Cover = 3%
Rear Crank Seal = 3%
Turbo Charger & VGT actuator = 2%
Covers (oil pan, valve covers, breather) = 2%
Cracked or Porous Block or Head = 1%
IPR valve/Engine Lube oil pump = 1%


http://www.forddoctorsdts.com/photographs/index3.php
Great information site as well.
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Old 02-23-2008, 11:50 PM
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Other Info (possible sources):

Weeping return hose from the intercooler that was putting a little oil up on top of the engine that found it's way down the back and to the bell housing.

CAC tubes: The CAC tube oil leak is caused because the crankcase ventilation is routed into the inlet side of the turbo, and oil build up in the tubes is normal, and then it seeps out around the hoses and onto the top of the engine then runs down the rear of the engine onto the bell housing.

Check to see if you have an icp sensor in your right valve cover ( 03 and early 04). if you donít, then it is under your turbo. The icp sensors have caused many oilleak concerns, especially on the 03 Ė early 04.

Oil Leaks from Lower Engine Area:
Some 6.0 engine may exhibit an oil leak that appears to be coming from the lower crankcase (bedplate), upper or lower oil pan, rear main seal, or front or rear covers. First inspect the cam and crank position sensors to ensure the leak is not the o-ring on one of these sensors. If the sensor(s) is wet, remove it and replace the o-rings. Cam sensor (driver side): 3C3Z-9N693-HA and -JA; crank sensor (passenger side): 3C3Z-9C064-DA.
An oil leak may occur at front or rear covers if they were removed without cutting the sealing joints behind them. Broadcast Message 1268.

Oil Leaks from Front and/or Rear Crank Seals:
If an oil leak has been verified as coming from either the front or rear crankshaft seals, the crankshaft end play must be checked to ensure it is 0.020" or less. If within specs, replace the seal using the correct tools and procedures. Broadcast Message 1240.


2003-2004 Oil Leak from Head Gasket:
Some engine may exhibit what appears to be an oil leak from the head gasket. Since there is no pressurized oil at the head gasket, a leak at this location is unlikely. Inspect the following area instead: turbo oil feed and return, oil cooler, HP oil pump cover, ICP sensor, IPR valve, valve cover gasket, rocket carrier gasket, Injector and glow plug ports and crankcase breather port. Use florescent dye and an UV lamp to pinpoint the source of the leak. If the leak is from the head gasket, the head should be removed and it and the block checked for flatness. Broadcast Message 0873.

Rear Main Seal Leak:
Some trucks with the 6.0 may exhibit what looks like an oil leak from the bellhousing, presumably for the rear main seal. This actually may be excessive grease from the torque converter pilot melting and running out of the bellhousing. It is recommended that 3 ounces of florescent dye be added to the oil, the truck driven, then the leak inspected with an UV lamp. If dye is detected, the engine should be inspected for leaks on top that may be running down the back of the engine. If no upper leaks are detected, replace the rear main seal. Broadcast Message 1017.

Oil supply line to the turbo

Bedplate gasket - sealing surface for the bed plate on the cylinder block assembly.

Oil Pan/Bed Plate:

∑ The 6.0L Power Stroke uses a two piece oil pan. The lower half is wider than the bottom of the engine to increase its capacity. Due to this wider oil pan, an upper oil pan is used to adapt the lower pan to the bed plate. The upper pan also acts as an oil baffle.

∑ The upper pan is bolted to the bed plate. The bed plate replaces the individual main bearing caps. This one piece design results in a more rigid bearing retaining system.

The pick-up tube is bolted to the upper pan and oil is routed through the upper pan and the bed plate to the front cover.
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Old 02-24-2008, 03:57 PM
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My o3 is the same with the oil on the belhousing.now if you are really givin onit you can smell burt oil.any ideas?
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Old 03-06-2008, 10:56 AM
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Got my truck back today. After dying the oil they found a boost hose leaking. It never occured to me but there was a groaning noise that is now gone. I guess it was leaking oil and air. Now that it's clean I'd like to keep it that way. Can someone point me to the CCV mod?
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