3800 cooling system from HELL

[Matthew Jeschke]

@bigdog9191999 thanks! I'll run through that list.

@B-train LOOKS EXACTLY like where the big puddle is under. I wouldn't be surprised if that is it!

 

[TollKeeper]

@OR VietVet - Hopefully you can help my memory here...

If memory serves correctly, the water pump bolts to the timing cover, and there 2 water pump gaskets, one on each leg, or a single large one, depending on year.

Then a timing cover, and gasket, that the coolant also passes thru, that mounts to the front of the engine block.

On my last 3800, the timing cover gasket is what had failed. It took me forever to figure out too, as I wasnt there to fix a coolant leak, but a power steering leak, that I had to dismantle all that to get too. Only found the issue after reassembly.

It can fail and leak internally, or externally. So if you are not getting a chocolate milk oil, consider yourself lucky! When it fails externally, it can be hard to trace, as the belts, pulleys, accessories, and harmonic balancer throw the coolant everywhere.

When mine failed, it would not leak when cold, but only when the engine was up to temp. Metals expanding/contracting. I mention this because if you try to find the leak by putting pressure in it, it might not leak.. But it also might.

 

[OR VietVet]

@TollKeeper, sounds like your memory is spot on.

I wonder one thing though. Has the cooling system been pressurized with a coolant pressure tester? If has and was said it has, I missed it.

 

[Matthew Jeschke]

@OR VietVet - Hopefully you can help my memory here...

If memory serves correctly, the water pump bolts to the timing cover, and there 2 water pump gaskets, one on each leg, or a single large one, depending on year.

Then a timing cover, and gasket, that the coolant also passes thru, that mounts to the front of the engine block.

On my last 3800, the timing cover gasket is what had failed. It took me forever to figure out too, as I wasnt there to fix a coolant leak, but a power steering leak, that I had to dismantle all that to get too. Only found the issue after reassembly.

It can fail and leak internally, or externally. So if you are not getting a chocolate milk oil, consider yourself lucky! When it fails externally, it can be hard to trace, as the belts, pulleys, accessories, and harmonic balancer throw the coolant everywhere.

When mine failed, it would not leak when cold, but only when the engine was up to temp. Metals expanding/contracting. I mention this because if you try to find the leak by putting pressure in it, it might not leak.. But it also might.

Strong possibility this is source of splatter along subframe in that area. I can see a small amount of coolant towards bottom of engine if I look closely in that area. The water pump was easy enough but not like anything I'd seen before. It was dirt cheap as it's not much of anything but a cover and turbine / blades. I keep however, wondering if I did the gasket wrong as there is some coolant in that area but not a drop around pump. Thanks for the tip!

@TollKeeper, sounds like your memory is spot on.

I wonder one thing though. Has the cooling system been pressurized with a coolant pressure tester? If has and was said it has, I missed it.

I hadn't mentioned that. It has, and it holds pressure long enough to lead one to believe there maybe no issue. However, there's always a pool of coolant under the rear driver side corner of the oil pan... Near where it was mentioned there's a coolant seal in the bell housing. I suspect that seal is shot.

 

[OR VietVet]

 

[OR VietVet]

More Information for FEL-PRO BS40708

At RA, it is listed as a crankshaft seal and at the bottom of all the choices, it shows 2 choices for the REAR seal kit.

 

[Matthew Jeschke]

Thanks for sharing that... but OMFG. No way can that be done without pulling the engine???

Have to take the balancer off for which I'm not sure if there's enough space in the engine bay to do that?? Maybe I could drop the subframe down a bit to get access?

Long story short, thanks for sharing that 100% on my way to get leak stop now. Probably not even worth fixing / trash the car before I go that far. Sad they made such a leaky motor as is good otherwise.