Smoking / knocking after water pump failure
 

Help! What have I done.

My water pump bit the dust and threw the serpentine belt clean off. I replaced both and fired it up.

I was letting it warm up so I could add more fluid to the bottle when it started smoking. I chalked this up to water I spilled when blowing out my heater core.

Then the white smoke started billowing and it started making a horrible knocking sound. The smoke is coming from the right side near the exhaust manifold. The electric fan kicked on at 210 but I don't think the thermostat clicked over. It didnt drink any more coolant which struck me as odd. When I shut it off, the oil pressure is lower than I had ever seen it.

99 Jeep XJ 4.0
15*,***

Oil on the dipstick looks normal
Started up fine, oil pressure good.

Exhaust manifold is actually on the left, which is the driver's side. In America.

Sounds like you may have overheated it and burned it up.

When the water pump went did the engine overheat? or did you shut it off right away?

From the sounds of it you blew the head gasket, a compression test or leakdown test would tell you for sure. Most auto parts stores rent both of those testers if you don't own one or want to buy one (although harbor freight has cheap ones). That will tell you if your head gasket is shot without having to pull the head.

Your thrermostat is probably fried from the heat, or age, but I'm leaning towards the head gasket because of the knocking noise.

head gasket or damaged cylinder head

I overheated it after installing the new water pump... air bubble or gummed up thermostat prevented the new coolant from moving about.

I tried a chemical block tester and that came out fine.

It drove about 10 miles today and it seemed strong. No problems. No smoke. No knocking. (It was a top end sounding knock that lasted about 10 seconds before I shut it down)

I'm going to drain the coolant and oil tomorrow and make sure they are not mixing.

Might have dodged a bullet. The white smoke is whats got me nervous.

White smoke is burning coolant.

Please do that compression test!

This is very true something caused it.


Do this at the very least.

Oil is definitely in the coolant.

The exhaust is blowing water vapor

I have metal shavings and black particles on the dipstick.

Is it time for a new engine? Or is there a possibility that I could fix whatever got damaged?

It's done. Pull it and fix it top to bottom.

Or sell it with full disclosure. Might bring $1,000 to the right person.

Yep. Or a rebuild, if the block isn't cracked.



Yep. There are two methods. Replace or rebuild engine.



You probably didn't have the cooling system full, ran it that way, and kablooey.

There is really no way for oil (other than automatic transmission fluid) to get in the coolant. When it threw the belt was the idler pulley seized?

Cracked head, cracked block, blown head gasket.

Long story short $$$$$ in any case.

If it wasn't for the metal shavings I would say just replace the head gasket and see what happens, but metal in the oil means it's been in contact with all the bearing surfaces. No bueno.

You could still rebuild it with new bearings and everything or find a good used one. Or sell it as someone said