Crankcase Pressure

[LR Pat]

Does the 02 6.6 Durmax have an alarm for high crankcase pressure, that
will be indicated in the service engine soon ?

 

[IOWA LLY]

No.

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[LR Pat]

Can the crankcase pressure go high enough to blow the rear main seal ?

 

[WVRigrat05]

Could if the crankcase vent is plugged up.

Pull your oil cap and see how much blow by you have.

 

[LR Pat]

I replaced the PCV, but the RMS leaks sometimes, and then go a week or so and does not leak ??? Wondering how much pressure the RMS is rated for ???

 

[JoshH]

I know a guy who broke his nose and orbital socket when his oil fill cap was blown off during an incident while welding a fitting into the lower oil pan. The rear main seal did not leak after being subjected to that much pressure.

 

[RPM Motorsports]

Cracked/torched piston will blow the rear main out with enough boost:thumb: , even with two 1 1/8" breathers on the valve covers.

 

[Burn Down]

Cracked/torched piston will blow the rear main out with enough boost:thumb: , even with two 1 1/8" breathers on the valve covers.

The bowed 1/8 steel oil pan was impressive and the fact that the driver kept from totaling the whole car was probably the most impressive of all:thumb:

 

[moparkxracer]

I blew a rear main seal with cracked pistons.

 

[56taskforce]

Cracked/torched piston will blow the rear main out with enough boost:thumb: , even with two 1 1/8" breathers on the valve covers.

I was thinking of you and that day at Woodburn when I read the first post here:rofl:

 

[x MadMAX DIESEL]

When you get a new one get a gm brand, they live longer than the victor reintz


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[LR Pat]

What are some other symptoms of a cracked piston, ( beside a RMS leak ) ?

 

[Yellow Jacket]

What are some other symptoms of a cracked piston, ( beside a RMS leak ) ?

With oil cap removed and idling, you will get puffs of air/mist from crankcase...and usually a slight miss or weak cylinder, injector balance rates will show a +7 or other significant # because it sees the poor contribution to engine idle rpm...

 

[LBZ]

Often the dipstick will get pushed out as well.

 

[melms23]

What's the info on the truck? Wouldn't it be fairly uncommon for an lb7 to crack pistons.

The only one I've seen with a cracked piston was an lbz. Fwiw it had only 1 cracked, but 4 had quarter sized chunks of skirt laying in the pan.

 

[malibu795]

Both my crack pistons were almost complete dead/hard miss with blueish/white smoke out the exhaust and a strong single puff out the oil fill tube both while towing..

 

[WVRigrat05]

Mine covered my truck and the car behind me with oil, I'd think he would know if it was a cracked piston.

 

[ikeG]

Our LLY puller had a cracked piston at 213k. Extreme miss and blown front seal from the crankcase pressure.

 

[LR Pat]

My 02 has a reman 6.6, with 60k miles on it now, ( 279k when I change it ) runs great, only thing is leaking RMS. Changed the PCV, to make sure the crankcase was vented... But it is intermittent leak, so I don't want to change the RMS, until I know why ??? I drove the same rout, same miles,temperature,speed, same RPM. Sometimes it will leak, sometimes it don't ( I even mad sure the weep hole was clear when it was not leaking )....

 

[WVRigrat05]

Could have been installed incorrectly or just a cheap seal. My explorer started leaking sometimes at 80k and now at 140k it leaks all the time