I have owned two Discoverys. A 4.0 1999 and a 2004 4.6. 100k miles between them. Bought the 99 with 109k on clock, 2004 at 69k. Neither died, both made noises. I chased thermostats and oil viscocities based on forum warnings and advice.

I traded my 04 in on a 2013 5.7 hemi Ram pickup. Not a fan of Chrysler products (except Jeeps) but they were dillusional about the value of the Disco so I traded in before they changed their mind.

Ram has 22k miles and makes many of the same noises the Land Rovers make. My point here? Aluminum block, pushrod engines make noises. Done with Land Rovers and Rams (lease is up). When yours dies, get something that doesn't universally make noises because they are maddening. Ride a horse or buffalo.

 

is your 99 a d1 r d2?

 

I did think about it. You are right. The temp inside the sleeve is much hotter. Obviously. There is a raging fire in there. The block surrounding the sleeve is relatively much cooler.

During an over heat the surrounding block increases in temp while the sleeve doesn't increase in temp. The metals behave differently than a non over heating engine.

That's all. I agree that sleeves obviously arnt the cause of all ticks. I'm explaining how sleeves 'might' move, which I originally replied to.

Edit. Link which explains my reasoning. http://physics.stackexchange.com/questions/12599/will-a-hole-cut-into-a-metal-disk-expand-or-shrink-when-the-disc-is-heated
It's a classic physics question. Thermodynamics. Innit. The block is acting like a hole cut in a sheet. The hole gets bigger. The the sleeve is reletively more loose.

 

Why do you have to bring Thermodynamics into the debate? Everytime I read a thread about ticking and slipped liners, somebody goes off and plays the science card! Inconceivable(add lispy accent)...

 

what I want to know is why is it that every post that ends in SOLVED.

is always over 100 post and never ends

 

That one is easy: Thermodynamics!

 

Yes Dad.....

 

Except the sleeve does increase in temp.

If the cooling is reduced thus higher temps then the other parts also get hotter.

Think about it...

The coolants job is to keep the hot parts cool even the sleeves. Cool being 200 degrees in this case. If things happened like you said no one would ever have melted pistons.

Also, my rover has over heated more than once...why aren't my sleeves slipped and people that have no over heating, ever, have slipped?

Why do people that work on rovers day in and day out say it most likely something else?

Why doesn't my rover tick?
Hell, up until a couple weeks ago my rover didn't even have any leaks....

If you remove the head gasket and there's a visible ring on the underside...I would agree that the liner could be slipping. Again, not saying it never happens...but not every single person that owns a rover had a slipped liner at 65k.

 

Agreed, I generalized. You are right. I was talking about the two items in relation to each other.

Point being that the sleeve and the block are expanding and contracting at different rates because they are different items. Different grades of different metal. Like the old bi-metallic strip in school science. It bends because they expand different amounts.

If you accept that the sleeve and the block are acting differently, then you accept that one "might" be loosening in relation to the other. You might say, it's only a few degrees, in practice. It can't make a difference.

I say it probably does. As pinning it seems to stop it. As does cooling (thus, contracting) the block with a cool hose pipe. All I have to go on is impirical evidence.

As for some engines doing it others not. We have no idea of the tolerances at production (or I don't). We also don't know the ambient conditions of the trucks and the level of overheating, other factors they have been through in their 10+ years of life. It isn't all down to mileage.

Seems we might be in an unfortunate sweet-spot. Another 1/1000" somewhere, might have made this all a non issue.

As you accept that some sleeves start to move, as you've seen ring marks on Hg's. How do you think they start moving?

 

I second the thermostat. Brought my temperature down from ~217 to 183-90, almost 30 degrees. As noted earlier, this is what inevitably eliminated my ticking.