rebuild problem

When I bought my Discovery, it was already somewhat in pieces. So I was unable to answer the question that the machine shop man just asked me.

He has skimmed the heads, he said they were very warped. He has re-bored and honed the cylinders. But he said the block was warped, also. He was going to skim the block, but there is a loop of metal which rises up above the flat level of the block on one edge and he can't work his machine around it. He wanted to know what it was for, I guess He's thinking of grinding it off if it is not important.

His second question was if I could find the manufacturers tolerance for how flat the block has to be because we might be able to leave it like it is.

Edit: I found this on the interweb: "The block can also be checked for flatness on the cylinder head mating surface. As with the head, the surface must be flat within .002 inch."

From: http://www.robisonservice.com/articles/RonR_march2006.asp

So I guess I just need to know what that loop of metal is for, I'm assuming for mounting something?

Thanks,
Roger

95 discovery I, 160k, 3.9l v8, automatic, AC.

If you mean the lug on the driver's side at the front, I think that's just a locating lug for machining of the block, but I'll check on our (later) block and see if there is a thread in there, or anything sitting against it.

In the pictures below, you can see the lug on the right hand side at the front outer edge of the block. The last picture is a THOR engine, post 1998 which does not appear have the lug at all.

Peter

listerdiesel said:

If you mean the lug on the driver's side at the front, I think that's just a locating lug for machining of the block, but I'll check on our (later) block and see if there is a thread in there, or anything sitting against it.
Peter

Click to expand...

I finally made it to the machine shop today to have a look at it, and that is exactly the lug I was talking about. It doesn't appear to be threaded.

Did you manage to check if anything bolts to it? Or can anyone else confirm?

If it's not for anything I'll just have him grind it off. He said he knew someone that could cut it off and weld it back on after they machine the deck. But if it's not for anything we could save a lot of hassle and just cut it off.

Thanks,
Roger

Well since there were no more takers to this thread and I couldn't find out what it was for, I told them to just cut it off.

My guess is that the lug was used in the factory for grabbing ahold of the engine block during assembly.

Thanks for your input Listerdiesel.

I'll post back here if it turns out to be a bad thing.

Thanks,
Roger