Cracked block or water pump?

[Aiden DeBoo]

Mechanic said block cracked. 4.0 remafactured from gearhead engine. Is this the block or water pump? And I would like suggestions to prove I didn’t overheat it. I am 100% certain I didn’t. (Mirror showing crank in photo)

 

[Link]

I can’t tell from your pics. My first suspicion is the water pump.

 

[Chris]

Can't tell from those photos to be honest. I don't think you're going to be able to prove or disprove that you didn't overheat it.

 

[Link]

Can you post some more pics?

 

[jeepguy03]

I'll be honest it is hard to see from that pic where the crack is, but my first thought about a crack in that area would be someone getting too aggressive during a water pump install.

If it is a reman'd engine, they likely put a heat tab somewhere on the block, which would melt in the event of an overheat.

 

[hear]

If it is a reman'd engine, they likely put a heat tab somewhere on the block, which would melt in the event of an overheat.

That's a thing?! TIL!

 

[BlueC]

I don't think you're going to be able to prove or disprove that you didn't overheat it.

If it's a reman, there's a chance they slapped one of those overheat tabs on it.

Edit; I just seen that jeepguy beat me to it.

 

[Chris]

If it's a reman, there's a chance they slapped one of those overheat tabs on it.

View attachment 653633

Oh damn, I didn’t even know such a thing existed!

 

[jeepguy03]

Oh damn, I didn’t even know such a thing existed!

A lot of reman companies and salvage yards with used engines will install them to cover their butts over warranty claims.

 

[Woodrow]

A lot of reman companies and salvage yards with used engines will install them to cover their butts over warranty claims.

pretty smart, really.

 

[Chris]

A lot of reman companies and salvage yards with used engines will install them to cover their butts over warranty claims.

Couldn’t one just easily swap the bad one out for a new one?

 

[Woodrow]

Couldn’t one just easily swap the bad one out for a new one?

Sure, now that we all know about it

 

[John Cooper]

Couldn’t one just easily swap the bad one out for a new one?

It would be possible, but most places put multiple tabs on the engine and head, and they like to hide them out of sight too.

 

[Chris]

It would be possible, but most places put multiple tabs on the engine and head, and they like to hide them out of sight too.

Well it looks like their secret is out now

 

[hear]

It would be possible, but most places put multiple tabs on the engine and head, and they like to hide them out of sight too.

There aint that many places to hide them.

 

[jeepguy03]

In theory you could swap them out, but the average person these days doesn't even know where the oil fill cap is.

 

[JKP]

Mechanic said block cracked. 4.0 remafactured from gearhead engine. Is this the block or water pump? And I would like suggestions to prove I didn’t overheat it. I am 100% certain I didn’t. (Mirror showing crank in photo)

The block is iron, the water pump is aluminum. So if a magnet sticks to it and it's cracked, it's the blk. If it doesn't it's the water pump.

 

[TJ Jim]

Isn’t the bolt pictured the one that enters the water jacket, that needs sealant to keep it from leaking?

 

[JKP]

Isn’t the bolt pictured the one that enters the water jacket, that needs sealant to keep it from leaking?

The head bolt requires sealant, but that appears to be the manifold bolt that intersects it.

 

[TJ Jim]

The head bolt requires sealant, but that appears to be the manifold bolt that intersects it.

Yeah I think you are right about that. But, isn’t that head bolt right there in that corner? I couldn’t remember if it was a head, water pump, or manifold bolt. But it is right about there.