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Water pump woes!


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I had the water pump go on me at the weekend after a cruise, ordered a new one yesterday stripped off the old one tonight and managed to shear off ALL the small bolts holding it on! Some major corrosion to the stems had caused this - before I drill out and tap these holes, does any one know the correct size and length of the bolts?

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I just went through this myself - except that I only lost one of them not all of them.<P>I did not have to drill the broken one out.<BR>I sprayed the stub that was stil there with PB Blaster every day for a week. Also kept tapping the stub with the end of a heavy ratchet. After a week or so I was able to turn it out with a vise-grip. Good Luck.<P>The bolt itself is 7/8" Coarse. Good luck trying to find that length. I could only find 1" or 3/4" (you could cut them down as they are threaded all the way up - I did not) so I went with 1" and placed a couple of locking washers at the top to eat up that extra 1/8". I also selected grade 5 hardened as replacements (in case I ever have to remove the pump again).<P>If you do have to drill be careful - that timing cover is aluminum.<P>Ira

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Hi<BR> Thread size is 1/4"-20. Also happened to me on my 430. Problem is you have a galvanic cell with steel and aluminum. so good to coat new bolts with some grease to insulate them. <BR> You may have luck too by heating the area (if stub is left) with small propane torch, heat until grease starts to smoke and gently work back and forth at first then back out.

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Guest John Chapman

To reduce galvanic corrosion try using stainless steel bolts and liberally apply anti-seize compound before reassembly. <P>Bolts of the proper tread, length and grade can be found at a good fastener vendor. In general, NAPA/AutoZone/HomeDepot/Lowes, etc. will not qualify as a good vendor for these items.<P>Links:<BR> <A HREF="http://totallystainless.net/totally.html" TARGET=_blank>http://totallystainless.net/totally.html</A> <BR> <A HREF="http://www.permatex.com/news/99/pr91099b.asp" TARGET=_blank>http://www.permatex.com/news/99/pr91099b.asp</A> <BR> <A HREF="http://www.newmantools.com/felpro.htm" TARGET=_blank>http://www.newmantools.com/felpro.htm</A><BR> <A HREF="http://www.northerntool.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=377343&prmenbr=6970&cm_catid=000094&cm_partner=tl&cm_pid=377343&cm_ref=http://hotbot.lycos.com/?query=tap+and+" TARGET=_blank>http://www.northerntool.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=377343&prmenbr=6970&cm_catid=000094&cm_partner=tl&cm_pid=377343&cm_ref=http://hotbot.lycos.com/?query=tap+and+</A> chase&cobrand=&matchmode=all&datedelta=0&language=any&recordcount=10&descriptiontype=2&modsign1=MC&dateoption=within&placeselection=georegion <P>Before putting it all back together, don't forget to chase out the bolt holes in the block with a tap to clean up the threads and flush well to remove debris.<P>Cheers,<BR>John<p>[ 05-08-2002: Message edited by: John Chapman ]

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Don't drill unless you don't mind buying a new cover. Once the drill hits the bolt it will tend to glance off of it into the softer metal surrounding it. I ruined a carburater like that once. You may end up having to take the whole cover off in order to get to the broken bolts mad.gif" border="0<P>I'm going to upgrade my bolts the first chance I get.<p>[ 05-08-2002: Message edited by: Tomsriv ]

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