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Sportster Motorcycle - Bottom End Cams, Cases, Gears, Flywheel, Piston Conecting Rods, Oil Pump, etc...

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  #1  
Old 22nd June 2018
Peteroo Peteroo is offline
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Default Oil Pump Hard to Spin

Just rebuilt my oil pump on 79 iron, and when i press the two housing halves together and spin the gear it is pretty stiff, not light feed back like i have seen it should be. should i be concerned or is this relatively typical?
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  #2  
Old 22nd June 2018
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When I rebuilt the ‘06”R” at 99,000 miles the new pump from the MoCo felt stiff to me and my Indy, 3,000 miles later failure. F.W.I.W.
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Old 23rd June 2018
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Make sure you have the correct parts for your oil pump.

From the Sportsterpedia:

The late 83 oil pump assembly (26197-83) gerotor gears are fabricated without the chamfered top and bottom on the outer diameters as was in the 77-E1983 gerotors. This new assembly will retrofit to 77-E83


## Late 1983 pump bodies and covers were also under-cut or relieved to accommodate for clearances with the new gerotors.


## The 77-E83 chamfered gerotors have a (.020“ x 45° chamfer or .020”) radius and the same radius is designed into their respective oil pump body / cover.


## The Late 83 pump body and cover has a (.010“ Max.) undercut for clearance designed into them.


## These modifications limit interchangeability and affect the installation of repair parts:

## Either early style or late style gerotor gears may be used with late style (under-cut) oil pump bodies and covers.


## Only early style chamfered gerotor gears may be used with early style oil pump bodies and covers (Use of late style gerotor gears in early style oil pump bodies and covers could cause the oil pump to bind up and possible pump failure).


http://sportsterpedia.com/doku.php/t...n_modification
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  #4  
Old 25th June 2018
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Default

looks like i have the chamfered gerotors so thats not it. Also,FWIW, the pump is chrome doesn't look stock to me and I noticed what looks like a laser engraving on one of the gerotors. Engraving looks like one of those square scanable barcodes.

Last edited by Peteroo; 26th June 2018 at 01:27..
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Old 26th June 2018
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Default

[IMG][IMG][/IMG][/IMG]
[IMG][/IMG]
[IMG][/IMG]

Looks like theres some rubbing on the top and bottom housing, not sur if thats regular or not but it would explain why its tough to turn
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Old 27th June 2018
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Does it bind up off the motor? Or is it only when installed? There should be specs in the book for clearances to check and make sure everything is kosher and you have enough clearance.

In particular, the amount of stickout of the feed gerotors above the lower case. If you have too much it could be binding up. I know some aftermarket oil pumps often need "massaged" to work properly out of the box.
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Old 27th June 2018
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without the top of the pump on it spins with some resistance, once i put both halves together and compress them tight it binds up pretty bad
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Old 27th June 2018
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I would NOT use that set up, go to plan "B".
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Old 27th June 2018
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any thoughts on wet sanding the flats on the gerotors? orrrr should i get a used pump and get some combo of the two to work?
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Old 27th June 2018
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What is the amount the feed gerotors stick out over the bottom cover? Is it within spec? When you put it together are all the parts there in the proper spot?

I would avoid sanding the gerotors at all unless you can be 100% sure they're the incorrect height.
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