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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Stewart G Griffin on October 08, 2013, 04:47:44 pm
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Do you know what size/length and thread the water pump bolts are. And, do i need to put any sealant on any of them?
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I always use never seize on anything that goes in a water jacket. I know they are 3/8" 18 thread, but exact length escapes me.
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Jegs says 3/8"-16 x 2"
http://www.jegs.com/i/JEGS-Performance-Products/555/83901/10002/-1?parentProductId=2088417
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i guess what i was trying to ask was, do any of the bolts go into a water jacket? Especially, the top driver's side?
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i guess what i was trying to ask was, do any of the bolts go into a water jacket? Especially, the top driver's side?
All four W/P bolts penetrate the water jacket on a small block. Use non-hardening Permatex #2 or Teflon paste sealer on the bolt threads.
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Oh great. Oh well, this engine is getting ready to come out anyways.
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They're not difficult to reseal in the interim - just wire wheel the threads one at a time and reinstall them with some sealer. It helps to chase the threads in the block, but isn't absolutely necessary. The slightly more involved repair would be if the W/P gaskets were deteriorated to the point of needing replacement.
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The other thing i wanted to ask was what thread size is the water pump pulley flange? It seems like they are machined just a little "off" so that the studs don't vibrate loose?
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The flange should be threaded 5/16"-24. Typically, four ~1" studs are used that are 5/16"-24 (NF) on one end and 5/16"-18 (NC) on the other. Grade 5 nuts with split washers retain the fan or clutch to the W/P flange.