I've had a KJ Cherokee with the 2.8 CRD for a couple of years now.
The major issue I had was the clutch fan, I used a fix from LOST Jeeps in the US, others have used clutch fans off 5.8 lt Fairlanes.
Not a big cost either way, the turbo hoses can also blow and $300 will get a set of Samco silicone hoses that will last forever.
It really is an awesome little motor that just keeps on giving.
I'm sure everyone on any Jeep forum will agree that once a Jeep owner.....
Good luck and happy days ahead in which ever Jeep you buy!