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1989 560 SEL, 1993 400 SEL, 1986 420 SEL, 1977 450 SL, 1984 300D, 1981 380 SL, 1983 500 SL
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606 Posts
Discussion Starter #1
What is the purpose of the "Seep Hole" on the water pump? Does anybody here know why it is even designed into the water pump in the first place?
 

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1995 S500 coupe, 1990 Mazda Miata
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694 Posts
I've wondered the same thing. Best reason I can figure is that coolant leaking past the internal seal could wash lubricant off of the water pump shaft bearings, possibly causing the pump to seize and cause catastrophic damage involving fans going through radiators etc. Also, leaking coolant would be flung by the pump shaft onto the belt and pulleys. However, on most auto applications, the seep hole drips down on the harmonic balancer, cancelling the second advantage.
 

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2007 E350 4Matic P2; 2008 GL320 CDI P2
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20,153 Posts
It is to prevent the damage to the bearing.

As for the second reason, the engine compartment is very rarely considered to be a dry area, so the belts are already designed to accommodate being wet.
 
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