Water pump job from hell
So i began my dreaded water pump on a duramax journey almost 2 weeks ago. Coolant coming out of the weep hole, my buddies convinced me not to take it to a shop so here i am. Got everything apart, fan gave me a slight hiccup of trouble at first but got it off with a pry bar and hammer. Then came the harmonic balancer bolt, shoved a punch in the flywheel to hold the crankshaft from spinning. Wouldn’t recommend it, if you have the heads up and can wait for shipping i strongly suggest ordering the specific tool for it.
Anyways broke it loose, was tough but got it. Took the 2 water pump bolts out and 1 nut, nothing crazy. Then came the 2 nuts holding the outlet pipe to the water pump housing on the side of the motor. These are straight up not fun to get to. One you have to get at from under the motor and the other from the wheel well. Which means you also have to move the intercooler pipe on the side of the motor. So get those off, pump comes out. I notice the gasket they gave me for this hard to reach pipe is paper...i put it on very skeptically but hey maybe people know more than me.
Weld the new pump both sides of the shaft, good to go. Throw it in, everything goes back together fairly well.
Start it up, leaking horribly out of the o ring at the t-stat housing. My fault i guess, should have checked it stupid me.
Take the s*** apart again put new o rings on it(which by the way were very tough to find the right size at any parts store). Everything goes back together normal, start it up, idles for 15 minutes while i put tools away without a leak.
Sweet i got my truck back im gonna go around the country block. I almost get back home and: LOW COOLANT. Temps at 220. Pull it back in the garage and that paper gasket is leaking horribly from the outlet pipe on the side of the engine. After cursing a lot of cursing i take the s*** apart again and this time have to take the pump out again in order to get the gasket on the studs. The dealership gave me a METAL gasket now im sure this is gonna work. Just for good measure i got buy the black gasket maker/sealant to put on it! Cant lose now right?
I put a light coating on the gasket, stick it on the pump housing and get it mated up to the pipe. Torqued to “18 ft lbs” going by ugga tuggas because it is impossible to get a torque wrench in there. So everything goes back together again. Start the thing up, and theres a slow drip coming from that gasket still. Not nearly as bad, but still there. What gives? I cleaned the surface off good before i put the metal gasket on. Im out of ideas
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