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Water pump bolt problem

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HughB

09-20-2007 15:19:18




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The water pump on my 2404 with the C135 engine has been dripping water for some time. When I went to remove the water pump two of the bolts came out easily. The third bolt also holds the generator bracket. That bolt was already rounded off by someone else. I tried a number of ways to get it off short of heating it with a torch. I will load it up on a trailer tomorrow and take it to a friend who has the equipment to take it out.
Two things have been apparent from this. Number one, I should have changed the pump out when I was rebuilding the engine, but it wasn’t leaking at that time. Dad always said “don’t fix it if it isn’t broke”. Wrong, I should have done it then.
Second, the bolt appears to have been corroded with electrolysis. Could this have been caused by the fact that the generator bracket attached to that bolt? Has anyone else had trouble getting that bolt out?

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HughB

09-21-2007 11:04:02




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 Re: Water pump bolt problem in reply to HughB, 09-20-2007 15:19:18  
Took it to my friends shop this AM. I had already cut the head off the bolt and tried to slip the pump off that way. The pump was frozen to the bolt and would not move. We heated the casting around the bolt with his acetylene torch. That loosened it enough to be able to twist it out. the bolt was not frozen to the block only to the pump casting.



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Janicholson

09-21-2007 12:40:15




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 Re: Water pump bolt problem in reply to HughB, 09-21-2007 11:04:02  
Good procedure, JimN



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K.B.-826

09-20-2007 19:54:06




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 Re: Water pump bolt problem in reply to HughB, 09-20-2007 15:19:18  
Hugh, I think I'd go ahead and cut the head of the bolt off, slide the pump off, cut bolt again so that you have about 3/4" of it sticking out past the mounting surface, then go to work with the torch and welder. Try heating bolt cherry red and then allow it to cool on it's own. Then weld a nut to the end, allow to cool, and hopefully it'll spin right out. If it turns but turns hard, work it out and back in 1/8 of a turn at a time while spraying with penetrating oil. This may sound like a lot of work but you'll be kicking yourself if you break it off below the surface. Apply never-seeze to the new hardware.

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Janicholson

09-20-2007 17:37:35




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 Re: Water pump bolt problem in reply to HughB, 09-20-2007 15:19:18  
The generator could find a ground through that bolt, but the fixed mount is usually the primary path, and the bolt would likely only hold the bracket to the WP grounding at the casting. The bolt is corroded (probably) by leaking coolant/water that got into the bolt hole at the pump block interface, and filled the hole around the bolt with dried out components of antifreeze. Still a tough removal. Good luck, JimN

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