Jeepdan's tornado teardown

[jeepdan]

First observations from the engine teardown so far.

I could not believe how clean it was inside with no sludge, and the cylinder bores look and mic out good.

The crank pins mic out just in spec. haven't checked the main crank bearing journals yet.

The bad is, I found all connecting rod bearings badly flaking babbit.
See picture.

The two center main bearings were flaking as well, but not as bad.

I think that I caught things just in time to avoid a bad bearing failure.

Note the engine ran quiet, with great oil pressure before I removed it.

[David Zelinski]

YIKES!!! Looks like you found it in time!!!! Looking forward to your rebuild.

[fng]

Good catch. I saw a set of bearings on ebay under Jeep 230 search. They were reasonably price (70.00) and had all the sets. Not just the 1,3,5 sets you see a lot.

When I did mine I had to order them from a Turkey in Istanbul. .....haha,....... get it?!?

Anyway, keep the pics coming, love seeing what someone else does or has to do. I still have all the parts to do two more longblocks/heads. May do them as projects after I finish completing the truck.

[jeepdan]

Just got a call from the machine shop, they found the crank shaft bent .006 He was surprised as I was considering the condition of the journals.

Lesson learned, Next time, I will check for run out while the crank is resting in the block.
Don't assume anything, even from a 17,000 mile engine.

[md1970]

looks like the engine has had antifreeze in the oil at some time in its life. antifreeze will do that to bearings. jmo
morgan

[jeepdan]

Can the tuftrided steel crank be ground undersize for .010 under bearings,
without needing rehardening?

[fng]

There is a blurb in the manual that says any reconditioning of the crank requires re-tuftriding treatment.

I know that may be a vendor requirement but I wonder if it would REALLY be necessary?

[md1970]

if crank is bent its junk & i bet the align bore in the block is off by alot from the bent crank putting odd stress in it. the m715 engine is superb and made with nothing but the best of everything. they get a bad rap because everybody drives them too fast. i hated to pull mine out.
morgan

[jeepdan]

Got the engine components from the machine shop.

1-Complete overhaul on the head. Old valve guide bores were worn from spec. (that might help with oil consumption).

2- Crank ground .010 under. He assures me that it will be fine.

3- Block only needed a light hone of the cylinders, to mate with a new set of standard size rings, on the original pistons. Money saved there.

Beside a horrific price of the gasket/seal kit $270, the biggest sticker shock so far has been the price of crank bearings.
$240 a set for mains, and $24.00 each for rod bearing

More pictures to come

[md1970]

THATS purdy.................. I always wanted to O/H a m715 engine. I have most of the stuff to do it except rod & main bearings. my pistons are civy pistons though.