Cylinder wall corrosion

[Racer X]

So, I took apart the 3.2L to check up on an oil burning issue. I found 12 of 12 leaking exhaust valve stem seals, and while the rings looked ok, I found a problem with the #1 cylinder:



If I run my finger up and down, I can feel a profile. Is this fixable, or am I completely [screwed] and going to need a new 3.2L block?

 

[St Louis SHO]

I'd hit it with a hone and see if it removes the profile. Then (if you can) measure the bore to see if its still in spec. I'd have to lean towards a stuck ring by lookin at that spot on the wall

Edit: I see you already tore it apart Doh!

 

[93rev2sev]

a hone will not remove the profile. You need a new block.

 

[hawkeye18]

Bore that shit out to 3.3L! lol

 

[Racer X]

Haha yeah it's already in pieces, the block is strapped down in the back of the Cherokee.

I've been running it for almost the past 3 years now and only recently took it off the road. Before that, it sat for a while in a storage shed before I bought it, however during my initial inspection, there was no hesitation when I cranked it by hand.

 

[Racer X]

Just heard back from the machine shop. He said the honing cleaned up 99% of it. Looks like this engine will live out the rest of it's days as a 3.2L.

I'll have pics when I get it back from the machine shop later today.

 

[yamahaSHO]

You've got more faith than me... I don't think I'd reuse the block without boring it.

 

[St Louis SHO]

You've got more faith than me... I don't think I'd reuse the block without boring it.

If it's still in spec, why not? Loose motors run better

 

[yamahaSHO]

Like I said, more faith than me. With how cheap and easy you can get a block, it's not something I would do without completely boring it out.

 

[hawkeye18]

If it's still in spec, why not? Loose motors run better

And you don't have to buy them as many drinks.

 

[AREA 91]

So, I took apart the 3.2L to check up on an oil burning issue. I found 12 of 12 leaking exhaust valve stem seals, and while the rings looked ok, I found a problem with the #1 cylinder:



If I run my finger up and down, I can feel a profile. Is this fixable, or am I completely [screwed] and going to need a new 3.2L block?

I know of at least 2 SHO engines that looked like that. Both are still running to this day.

 

[93rev2sev]

I still find it hard to believe that a hone (and a hone only) is aggressive enough to remove visible ridges. I would have thought you'd need to cut at least 20 thou...

Guess there's hope for more heavily damaged blocks than I thoght.

I'd love to see before and after compression ring end gap numbers.

 

[AREA 91]

I know of at least 2 SHO engines that looked like that. Both are still running to this day.

I still find it hard to believe that a hone (and a hone only) is aggressive enough to remove visible ridges. I would have thought you'd need to cut at least 20 thou...

Guess there's hope for more heavily damaged blocks than I thoght.

I'd love to see before and after compression ring end gap numbers.

The last one I measured was just in spec, as far as ring end gap.

 

[Devin]

Those coolant passages look terrible.

 

[93rev2sev]

The last one I measured was just in spec, as far as ring end gap.

I'm talkin about after the hone removes those ridges....measured at several ring depths.

 

[Racer X]

Yeah, so, uh... I didn't take before measurements.

Shucks.

 

[St Louis SHO]

Yeah, so, uh... I didn't take before measurements.

Shucks.

Meh, the machine shop measured it for sure. Main reason = they make more boring it than honing it

 

[hawkeye18]

Those coolant passages look terrible.

T-R-B-L. Trbl!

 

[Racer X]

Those coolant passages look terrible.

Ha. You should have seen the coolant that came out when I first flushed it during the swap.