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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 24th December 2009
1976 XL's Avatar
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Default Oil pump body not milled correctly?

The last mechanic that worked on my 76' Xlh replaced the oil pump body. After about 170 miles on the new top end, the pump blew out the sending unit(oil everywhere). I bought a new unit from J&P and noticed a key way not milled into it(I compared it to an old one I had on hand). My questions are, "has anyone used one of these pump body's from J&P?" Did I get an unfinished product? I haven't yet pulled my engine, or the current bad pump. I wanted to get all of my parts and gaskets first. Any feedback is appreciated
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  #2  
Old 24th December 2009
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If you're talking about the mark in the hole where the seal is, that ain't supposed to be there. It's not a keyway.
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Old 24th December 2009
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That is correct. There is a slot under the seal, but not on the new pump body. Thanks MeanMechanic for the response. Unless I get some different opinions, I will start the tear-down soon. It seems like it goes back together quicker if I tear it down and put it right back together. And Merry Christmas to all of you on the Ironhead Forum
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Speaking of that mark...I happen to have one just like it that I was going to install and was wondering the same thing. The pump shaft goes through that hole and the seal is there obviously to allow a pressure differential to build up across it. Will that indentation cause trouble?

Thanks, and Merry Christmas to all you old iron head mofos.

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Old 24th December 2009
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That mark comes from either the snap ring coming off the bottom of the gear on the pump shaft (not likely) or someone trying to hit the shaft through the housing without taking the key out first.
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what if your body has that indentation and your pump has never been apart? mine has the same thing, it has never taken apart till i did, i didnt push the keyway through and my snapring was in place.
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I guess prying the pump from the case with the snapring off maybe. Maybe if it's the original pump someone had a bad day at the factory. No matter, the mark shouldn't be there. If it don't go all the way through it'll work fine.
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The slot on my old pump body doesn't go all the way through, it appears to be machined into it, half-moon shape, straight edges, etc. That is why I thought the new body was lacking the necessary milling.
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Old 24th December 2009
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That mark is from somone trying to remove the pump body without removing the key from the pump shaft?
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the slot in mine also appears to be machined. i remember trying to figger out what is was for when i had it apart. i thought it might to let oil that got past the seal somewhere to go.
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