D6T engine removal

You mean two of the six cores shown below.?
If so you probably need to think about dumping at least a bottle of Conditioner, maybe two, in the system when you refill it. See attached.
I think you could possibly have a couple of aftermarket cores. The OEM Part Number for the Core is not aluminium. However with the conditioner it shouldn't matter either way.
Another suggestion. When you reinstall the cores with new seals at the bottom DO NOT use anything petroleum-based such as Vaseline as a lubricant. It will rot the new seals. Better to use something like liquid dish soap.

Yes I am talking about the six cores and two of them are aluminum. I will plan on using conditioner. Thanks.

I am getting further along on the project. What should I use to seal the flywheel housing to the block? Cat dealer says to use locktite 38657 which I believe is anaerobic and won’t work on the aluminum oil pan from what I’ve read, and the fly wheel housing joins it as well as the engine block. What are your thoughts?

Steve4440 said:

What should I use to seal the flywheel housing to the block?

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Cat 1U-8846 Liquid Gasket, aka "Cat Red".

That cross references to Loctite 38657



A handy link, Loctite for Cat applications with a crossrefrence in the index for the Cat part numbers you find in the service manuals. SOME of these products will be available at a Cat dealer especially the more common ones.

https://www.proloctite.com/caterpillar/downloads/cat-global-catalog-na.pdf

Should I use blue loctite on the flywheel bolts

Steve4440 said:

Should I use blue loctite on the flywheel bolts

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If you are reusing the bolts the Service Manual calls for Loctite 243 and torque the bolts to 220+/-30 ft.lbs. There is no Loctite called out for new bolts and the torque specification remains the same.

Nige said:

If you are reusing the bolts the Service Manual calls for Loctite 243 and torque the bolts to 220+/-30 ft.lbs. There is no Loctite called out for new bolts and the torque specification remains the same.

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i personally would still use loctite on the new bolts myself. Belt and suspenders approach never hurts.

A properly torqued bolt in a properly engineered connection will not come loose on its own. You can observe this when you are taking them loose without impact tools. The installation torque might be 250 foot pounds but the removal torque may somewhere over 300 foot pounds.

Problems happen when impact tools are used or torque wrenches are not used and the bolts are stretched into a yield state and they can no longer hold the proper torque. The other problem is vibration loosening bolts. The real issue with that is the connection is not properly engineered.

To put it simply, I only put components together following the manufacturer's specifications and never used a synthetic agent on the threads except when it was called for by the manufacturer. If I had problems with a threaded fastener coming loose in normal operations, I looked first at the fastener itself, the threaded hole that it engaged with and the application that it was being used on. If nothing was obvious I then started looking for solutions that might involve some sort of synthetic thread locking compound.

If it wasn't loose when you took it apart and Loctite wasn't used then, why complicate it for the next guy.

Thanks for the input. I am going to use loctite.

Hi, if you are going to use loctite run a tap down the holes and clean.
Make sure the crank face and flywheel mating area have no nicks, dirt or bruised areas that could cause flywheel run out
install flywheel with all the bolts snugged up tight,remove one bolt at a time and install loctite and reinstall and torque bolts
This insures that no loctite is trapped between the mating faces causing problems

So I have an extra seal I can’t find where it goes. The number is 298-6387. The only thing I can find on sis is that it comes in a torque converter gasket kit. Does anyone know where it goes. I didn’t remove any this size but my cat dealer ordered it for me.

#24. 298-6387 replaces 6V-7681 which was the orignal Part Number used.

Thanks so much. I appreciate you sir.