So I'm doing the engine teardown and I come across this. Does anyone know how this happened? I know is something with the oil, but is the oil injector bad? And how do I fix it so it won't happen again.
Thanks

 

If your talking about that brown crud, thats in the coolant, not oil. Looks like bars leak. Dont use bars leak to prevent that.

 

thank, now that you said that it make sense.

 

once you pull the block apart hot tank it and make sure the coolant seal walls are all within spec.

 

ROFL looks like someone pooped in your coolant passages. I typically have those plugs blocked with pineapples seals. But looks like there is some corrosion happening probably due to worn water seals or not changing out the coolant when you need to. If the coolants been sitting for a long time that enough to make the color of the anti-freeze brown but that build up looks like more neglect than just sitting. But a good cleaning will fix that when you do a rebuild.

 

that's "mud"

i've seen it in every engine i've torn down that's over 10 years old. pretty sure it's a biproduct from the engine using both aluminum and iron components.

that spot doesn't have a lot of coolant flow, so the deposits have a place to settle.

more frequent coolant changes can prevent it.

 

looks like someone tried to block it by filling it with silicone...? check the texture. that will help out...

people usually plugs those anyways. cheap and easy way is a quarter with some high temp silicone. i done it that way on every motor i have had. never had a leak or a problem.

 

wtf? I've had 4 different engines and have never once seen those holes open. They all have plugs in them. Whats the purpose of them?

 

the ports are only open on turbo motors. the rear rotor housing port provides coolant for the turbocharger itself through the lower intake manifold.

 

I thought it was to prevent the intake from freezing up in below freezing temp, and to feed the turbo.

 

uh.... what?

 

Well.... alot of cars have coolant flow through the throttle body or intake manifold to assist in cold weather and below freezing conditions.

 

Yeah, for the thermo wax, and fast idle on most cars.

 

On a non turbo you would have what looks like freeze plugs in those holes, but on a turbo (as mentioned above in another post) the one on the rear housing feeds water to the turbo and the front one just dead ends right there.

What has happened is the previous owners of that engine didn't use the right coolant and probably never drained and cleaned the water out of the engine periodically. So corrosion occured and ended up in the *dead end* passages of the engine. Not desireable. Think Rust.

The rear side housing has freeze plugs in it and are used for what you mentioned (keeping the engine from cracking if not enough antifreeze is used in freezing weather. The front side housing might have them also but..........I forget.

 

Has anyone ever seen what happens when you mix red and green coolant? Thats not what happened here but it has sent many new cars back to dealer