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I had a leaking water-pump gasket. I removed the old pump and gasket. The pump didn't have a 996 number and the gasket was made of typical soft gasket material, so I think neither was Porsche OEM.
Got the new Porsche pump and Porsche metal gasket in. Due to the really tight space, none of my three torque wrenches fit, so I snugged down the bolts, probably tighter than 7 ft-lb.
Upon removing the jack stands and dropping down the rear of the car, coolant started leaking our what appears to be the joint between the top of the water pump and the engine block.
Maybe I tightened down the bolts too much. Has anyone reused the metal gasket, or is a new one needed?
I would recommend a new gasket because there are ridges around the gasket that are meant to be compressed so to me it's one time use.
You may want to chase all the bolt holes carefully as there could be corrosion, gunk, sealant, etc that could prevent the correct torque to be applied to the bolts. 7.5ftlb is so little force that any foriegn objects could stop the bolts from clamping down the water pump
I would recommend a new gasket because there are ridges around the gasket that are meant to be compressed so to me it's one time use.
You may want to chase all the bolt holes carefully as there could be corrosion, gunk, sealant, etc that could prevent the correct torque to be applied to the bolts. 7.5ftlb is so little force that any foriegn objects could stop the bolts from clamping down the water pump
The gasket is a one-time use only part, it will compress and deform once force is applied.
It it is remarkably easy to get the gasket out of position when reinstalling the pump. I struggled through that for a while when I replaced mine.
I just removed the new water pump and the leaking gasket. I removed eight bolts with three different length. I didn't notice the length differences when I first removed them. The lengths are:
I just removed the new water pump and the leaking gasket. I removed eight bolts with three different length. I didn't notice the length differences when I first removed them. The lengths are:
One 20-mm
Four 25-mm
Two 30-mm
Any suggestions on which ones go where?
Check out post #18 here. I thought there are only two sizes and not three.
Thanks for the tips. I managed to reinstall the water pump with a new gasket, with all bolts tightened to 7 ft-lb. I tightened them in a crossing pattern like you would with lug nuts for a uniform tension. No leaks so far after 25 miles of driving.
I suspect that I had a leak at the top of the pump after my first installation because I used a long bolt at the top. It probably bottomed out in its hole so it felt tight, but it wasn't tightly clamping on the pump.
The shot below shows the 8 bolts that I removed. If you look closely, you can see that I removed one bolt that didn't belong to the water pump. I couldn't tell this when I was removing it because there is no way to clearly see the pump's bolts when the engine is in the car.
The small 3/8-inch-drive CDI brand torque wrench that Ahsai recommended is really nice. It is short and has a smaller-diameter handle than my Craftsman 3/8-inch torque wrench, so I was able to fit in in to torque all of the bolts. I could torque all seven with with a short 10-mm socket and a very short extension. A photo is below.
05-06-2019, 03:03 AM
