It was an improvment from the D1, all d2 4.0 should have the lip.

 

I thought it was an improvement over the 3.9. I thought all of the cross bolted blocks had the lip.... I could be wrong.

 

Im really not sure on that, everything I have found indicates it was a d2 improvment.

 

I am confused how so many people have had slipped liners if it's impossible to slip.

 

Because certain folks on the forums keep repeating dire warning about overheating and dropping a liner. It was true for the D1. What can happen with the D2 overheat situation is the liner can become loose and tap up and down a few thousands which usually shows up as a rattle or tap at operating temperature. Also, the big danger is the thin and inconsistent made water jacket look at the variation in the cut away on a factory block. When over heated this wall can crack. Coolant can then seep out and pressure from combustion can go up and behind the liner into coolant system. This is even more of a danger with a loose tapping liner as there is more space and stress between the liner and the cylinder wall.

 

I just talked to my mechanic, says he's seen more than three in person, and heard about more. I'm not sure how it happened but he's physically seen it.

 

They probably slipped UP. I've seen pictures of that, where the liner is sticking up above the top of the block.

 

He said they had slipped down, and that they were unable to slip up.

 

The lip was an improvement and probably could have prevented many failures, the problem is that the sleeves weren't pressed all the way in to the lip when the blocks were manufactured. Buzz, your photo in a previous post shows a liner below the deck height. To me, that's a dropped liner. Not dropped in the pan, but dropped just the same. I think "only in horse shoes and hand grenades" applies here.

 

The liner not being able to drop down is a plus, when it fails down calamity awaits. Slipping up is annoying, and may contribute to other problems, but a lot of Discos driving around that way, ticking time bombs. There have been posts about pinning or bolting the liner. Maybe if you used really bad gas it would leave enough deposits to stick it in place, but then the rings are dealt a death blow. Perhaps a chemical engineer will get a tube of ultra temp goop #40987a and put a dab at the bottom of the liner, something to keep in in place just a little. Of course engines with cast in place liners have a rough surface on the back side, don't slide, and can be bored out, etc. A machine shop can install top hat liners, but you get to a point where love of the vehicle can't trump love of money. That point is of course different from one shade tree to another. With a great number of Discos available under $5000,,, well you get the point.

Note on the cutaway pix of the block, the water passages are slim. Now let us fill them with sludge, Dexmud, calcium, and stopz leakz. Not a lot of space to work with.