6.7L Cummins Crank Seal

[outofbounds]

Noticed a few drops under the truck this morning, after crawling underneath it appears to be coming from the front of the engine, so after some reading most likely narrowed down to the crank seal or timing cover.
2017, around 300k on the truck. No rush to get it repaired as I typically only use this truck for hauling and towing. I do have plenty of heavy trips planned once spring break hits as we will be building a new cabin so have plenty of sawlogs to haul.
For those that do repair on their own, any tips? This will be my first time doing the seal if it is in fact the seal.
As an alternative what would any dealership or mechanic shop look to bill for the repair outside of parts and diagnostic for those that may have had it done by a repair facility?

Thanks in advance.

[ClutchCanadian4]

PS pump will have to come off. Make sure you get a seal with the install sleeve, and pack the spring on the seal with grease to keep it in place. Careful to not bend the timing cover or mar the block when prying off. Using a die grinder with a scotch-brite disc will make gasket cleaning easier. Get a good solvent. Black rtv on corners and such. May need a puller for the crank pulley, but also might get lucky and not. Expect the fan to be a bugger, an air hammer attachment for fans will make it easier if you have the means, try to pop it off prior to the belt.

I would guess a shop would be in the $900 range for labour, maybe more. However if you're in Northern AB I know a guy who might be able to do it... Haha I am a mechanic with lots of Cummins experience.

[outofbounds]

Thanks for the pointers Clutch, I do have some time to gather tools that I may be short on. How far north is Northern Alberta for reference?

[leeelmer]

There might be a underlining issue causing crank seal to leak.
Thrust bearing wear?
Main bearing wear?
Thought these seals sometimes do let go, there are a host of other issues that cause it.
Crankcase vent filter been changed lately?
Not saying that it is not just a faulty seal, but in 20 plus years of mechanicing on diesel engines, there are often other issues.
If the front crank seal is leaking, then is the rear main leaking as well?
Make sure it is not the timing cover seal, or front structure seal leaking and the crank seal is fine.
Though to do either of these, you need to do the front crank seal as well.
You can watch some videos on how to do this, but from the amount of these I have changed after a customer has changed it first, and wrecked the front cover, front structure, even had one damage the crank sealing surface on the crankshaft.
So be careful and try your best not to damage anything.

[Peace Meal Farm]

Second the speedy-sleeve type seal.

The job pays 2.7 book time. Nothing crazy.

[outofbounds]

Originally Posted by leeelmer

There might be a underlining issue causing crank seal to leak.
Thrust bearing wear?
Main bearing wear?
Thought these seals sometimes do let go, there are a host of other issues that cause it.
Crankcase vent filter been changed lately?
Not saying that it is not just a faulty seal, but in 20 plus years of mechanicing on diesel engines, there are often other issues.
If the front crank seal is leaking, then is the rear main leaking as well?
Make sure it is not the timing cover seal, or front structure seal leaking and the crank seal is fine.
Though to do either of these, you need to do the front crank seal as well.
You can watch some videos on how to do this, but from the amount of these I have changed after a customer has changed it first, and wrecked the front cover, front structure, even had one damage the crank sealing surface on the crankshaft.
So be careful and try your best not to damage anything.

Yikes!!
Thank you for the input, assumption on no other issues, until I get into it and see firsthand the source of the leak. Certainly do not want to cause any self-inflicted damage in the process. The crankcase vent filter has always been changed prior to the noted intervals

[ClutchCanadian4]

Originally Posted by outofbounds

Thanks for the pointers Clutch, I do have some time to gather tools that I may be short on. How far north is Northern Alberta for reference?

Westlock County haha. And as mentioned in that other post, I would also check the crank case filter. Almost always it is plugged, sometimes will throw a plug. Most people don't even know it exists. If you've changed oil regularly I wouldn't panic too much about premature engine wear.

Sent from my Pixel 6 using Tapatalk

[outofbounds]

The engine and drive line have been serviced regularly, much more frequent oil and filter changes than the indicator on the EVIC, rarely roll over 10,000km intervals on synthetic, never has the truck been hot rodded, it has never seen extreme cold start temps.
See how she goes once we get into it.

[ClutchCanadian4]

Originally Posted by outofbounds

The engine and drive line have been serviced regularly, much more frequent oil and filter changes than the indicator on the EVIC, rarely roll over 10,000km intervals on synthetic, never has the truck been hot rodded, it has never seen extreme cold start temps.
See how she goes once we get into it.

Sorry I meant throw a code in my previous post haha. Crank seal is a very common failure point on these engines even with religious maintenance. Good thing is that the job takes care of the crank seal and timing cover both in the same go.