Pitted cylinder walls- should I send it?

PDHSB · Mar 26, 2021

Hey all, doing my first rebuild on my 4.6. I had the block deglazed, but there seems to be pitting in the bottom of cylinder #5. Can I run it this way or will this cause major issues?

It's at the bottom of the cylinder, so I don't think it will affect compression much, but will it cause my rings to seat poorly? I'd honestly be happy to get 20-30k out of this engine, I don't plan on running it for long, just as long as it preforms OK is my concern.

This is a shot for scale, and here's another zoomed in:

7991LXnSHO · Mar 26, 2021

That’s an ugly second picture. What happened to the block. Was it sitting with water in it?
It looks like time for an overbore. I would not trust a new state of rings in a mower to run long like this.

PDHSB · Mar 26, 2021

7991LXnSHO said:
That’s an ugly second picture. What happened to the block. Was it sitting with water in it?
It looks like time for an overbore. I would not trust a new state of rings in a mower to run long like this.

I honestly have no clue, but the whole reason I'm doing the rebuild is because of low compression in this cylinder.

7991LXnSHO · Mar 26, 2021

PDHSB said:
I honestly have no clue, but the whole reason I'm doing the rebuild is because of low compression in this cylinder.

There’s your problem. Can it last 20-30k? How much time and hassle is it worth to find out when we know it is not good? I do not see new rings setting right from the start. If nothing else, you should have extra oil consumption from the start.

PDHSB · Mar 27, 2021

MustangIIMatt said:
4.6 blocks, including the Teksid and WAP blocks are so cheap and plentiful at junkyards that it's just not worth taking the chance.

Either get it machined and get new pistons and rings to match, or get a different block.

Alright, guess I'm going to head to the junkyard soon. Can I run a WAP block with my current rotating assembly or should I just be looking for another Romeo?

7991LXnSHO · Mar 27, 2021

How about a takeout engine? It sounds like budget is the main concern.

PDHSB · Mar 27, 2021

7991LXnSHO said:
How about a takeout engine? It sounds like budget is the main concern.

Wear do you mean by takeout? Does the yard provide these?

PDHSB · Mar 27, 2021

7991LXnSHO said:
How about a takeout engine? It sounds like budget is the main concern.

After looking into it, this actually might be my best option tbh. The warranty is enough for me to consider it.

7991LXnSHO · Mar 27, 2021

If a little old lady/man lost their license after an accident that totaled the car, or a lower mile pickup wiped out on ice, you could be in the road for many miles. Whoever gets the engine and transmission out of our recently bent van should be set for at least 100k.

Deleted member 38176 · Mar 27, 2021

How can you even question this? That is some major damage! Your head is most likely cracked, causing coolant to enter and cavitation. You could try to machine the cylinder and get yourself a new head

PDHSB · Apr 5, 2021

Nightfire said:
How can you even question this? That is some major damage! Your head is most likely cracked, causing coolant to enter and cavitation. You could try to machine the cylinder and get yourself a new head

I thought this originally, but the machine shop themselves told me it would run, as long as I didn't have low tension rings. Either way I've got a set of ported head I've bought so old heads are getting thrown out.

Dubsport · Apr 5, 2021

I have been certified tech for 23+ years and I would either have it bored or toss it in the garbage... I don't think that would ever seal properly!

Pitted cylinder walls- should I send it?

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