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

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  #1  
Old 4 Days Ago
jlv jlv is offline
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Join Date: Jul 2009
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Sportster/Buell Model: XL1000
Sportster/Buell Year: 1977
Other Motorcycle Model: Dyna 1991, Honda CBX 1000
Other Motorcycle Year: 1981
Reputation: 77
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Default Oil pump Iron 1000 1979 bizarre.....

After complete rebuild of my engine, I blocked an admission valve after a few miles. The valve was easily rput back into its place with a little screw driver through the spark hole. Since I hate this type of behaviour of a brand new engine, I opened the top to realize that apparently oil never reached valves and cams, oil lines are perfectly clean' oil pump looks new, but after long inpection, I cannot understand how the oil could go to the engine if the place marked with a X on the below picture was not drilled. Before I drill it myself, i would like your advise re this blind element of pump. A factory mistake ? A model from later/earlier model (1979 had no oil filter).
Note that I never saw this engine in function before as I inherited the bike in cartons....



Thanks for your help.
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Default

That appears to be an 86-90 oil pump.
At least the bottom cover is.
Here's an 86-90 cover:


77-E83 cover:



77-85 pump body has only 1 fitting on the body:


86-90 has 2 fittings on the body:


The feed lines are configured differently on 86-90 than 77-85 oil pumps.
Here's the oil pump sections with pics and info for:
Evo pumps:
http://sportsterpedia.com/doku.php/techtalk:evoil03

IH pumps:
http://sportsterpedia.com/doku.php/techtalk:ihil03

What does the front of the pump body look like?
It's either L83-85 or 86-90.

edit:
If you have the L83 body and drill the hole in the cover, it won't work properly and it'll wet sump from the jump.
The feed gerotors got bigger in 86.
The depth of the cover got bigger to accommodate this change.
That'll leave the clearances too loose inside using it on a L83 pump body.
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Last edited by Hippysmack; 4 Days Ago at 12:28..
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jlv jlv is offline
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Other Motorcycle Year: 1981
Reputation: 77
jlv is an unknown quantity at this point
Default

Thanks alot for your help. By body pump has one hole only, withbthe brass connector where oil returns back to the tank. Without drilling, the only hole where the oil could go is the one tapped by the oil pressure sensor in the pumb bottom cover. With the hole drilled, the oil now can go to the side hole in the bottom of the case cover, and then go up to the upper hole in the sa8me case cover that feeds the cams pipe.
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If you use the 86 cover, your gerotors will be loose inside the pump.
They will probably deliver less oil to / from the engine.
Oil may also run straight from the feed side to the scavenge side starving your engine.
Just trying to help but you need the correct cover for your pump.
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I just tried to put the 86 cover on the E83 pump.
It just about doubles the tension on the gear to turn it.
The depth of the cover shows up on the top of the feed gerotors when buttoned up.
This squishes the (edit: scavenge) gears harder against the plates and will result in wearing down of the plates / gerotors.
This could warp the outer seal and oil can transfer between the pump sides..

Last edited by Hippysmack; 4 Days Ago at 20:18..
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You should also determine which feed gerotors you have.
The scavenge gerotors are the same size 77-90.

77-85 gerotor app. dims:
http://sportsterpedia.com/doku.php/t...b#gerotor_dims
86-90 gerotor app. dims:
http://sportsterpedia.com/doku.php/t...j#gerotor_dims

This is how the feed gerotors should sit in the the proper cover.
Spec: .001"-.011" above the lip.


This is how the 77-85 feed gerotors fit in an 86-90 cover.
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