Cadillac Seville / Cadillac Eldorado Forum Discussion, 92 Eldorado water pump replacement in Past Cadillac Vehicle Discussion; Hi Guys, I've read every posting I could find about the water pump. This is the first time I've yanked ...
Hi Guys, I've read every posting I could find about the water pump. This is the first time I've yanked this type engine apart. Obviously the new pump comes with a perimeter gasket. The micheal mouse part of this assembly seems to be that the pump is a three piece affair. It seems that there is sub plate, and another plate behind that. Is there a gasket that goes between the second and third plate? And without yanking the harmonic balancer and taking that plate off, how is it effectively replaces to assure a leak free installation? This seems poorly engineered.
I've owned the car 6 years or so and have encountered the low coolant/overheatin issue. The leak seemed to be coming between the second and third plate. Let's hope it isn't the head gasket fiasco !
Thanks for the encouraging info. Fortunately the pump came off with no bolt issues. Twice ! Tomorrow they are going to put it back together. I am having them put the pump in, hook up the hoses fill with water then pressure test and listen and look for leaks. If we have a leak in that goofy back plate, at least we don't have to rip everything else out. If it leaks, it's off with the harmonic balancer and removing that plate for cleaning and new gasket. I was under the impression that the 4.9 was as bad as the N*. I'm glad that although not impossible, the head gasket issue may not be an issue here. I'll report back when it's done.
The "plates' behind the wp are the timing cover and water inlet. The water pump seals to the timing cover with a paper gasket, and the inlet seals to the back of the timing cover with the same paper type gasket. That said, at 20+ years old, I recommend that you replace all of the gaskets in this assembly whether they are all leaking or not... if the wp gasket has leaked, why would the inlet gasket be in any better shape???
A few years ago I owned an '88 eldo with the 4.5 engine. Couple years after replacing the water pump a leak developed at the timing cover plate. The chain also had a lot of slack after 95k miles, so I had that replaced too.
I would recommend that you replaxe the timing chain and the timing gear cover gasket while you're in there. At a minimum check the timing chain over and replace the cover gasket.