I about to park my truck for awhile to do some preventative maintenance. Im going to replace the timing chain and gears and oil pump, also a new head gasket with refreshed heads. Should i do anything with the bottom end other than the oil pan gasket or let it be. ive read about slipped cylinder sleeves and wondering if i should do anything about them. This will be done on a 2004 with 120k miles

 

If you open the bottom end, it's probably a good idea to do the rod bearings while you're in there. Pretty straightforward job.

 

120k no need to do the rod bearings. I would do the crucifix seals though. Make sure to check all your cam bearings, although you would probably already know if they had slipped

 

 

If you don't have any leaks or knocks, don't touch anything. Honestly I wouldn't even touch the head gaskets if they're not leaking. I'd to the timing chain and oil pump, leave it at that. Inspect what you can see, but otherwise just let her run until you have an issue beginning.

 

 

My 04 has 122k miles
ran excellent, didn't heat, ticked loudly.
I ended up doing a full rebuild (just have to assemble engine now), because of bad crank, main, and rod bearings, and every gasket leaking.
If you have no ticking, heating, or any other problems...I would drive it until it does...or be prepared to put on some bandaids, or rebuild it while it's in decent shape.
It's very easy to work on.

 

Lol, have you read my post on crucifix seals??

 

Thanks for all the responses, I have a small coolant leak on the front drivers side of the engine either from the front cover or the head gasket, so i figured while im in there to do some other maintenance also. But i guess that makes sense to just leave the head gasket alone if that isnt the issue. But either way i will be replacing the rest of the top end gaskets. My goal is to just make it as reliable as possible. As for the rod bearings that someone mentioned, is that a major pita to do with the engine still in the truck or should i not even bother with them

 

As I mentioned, apparently they're pretty simple to do if you have the bottom pan off. From what I've read, getting the pan off is the hardest part. But if you don't mess with that and you've got no reason to suspect your bearings, I would leave it all alone. I was only throwing the bearings out as something to do while you had the opportunity, just so you wouldn't feel like you had wasted your time removing the pan.