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11-19-2011, 02:46 PM
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#1 (permalink)
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Junior Member
Join Date: Nov 2011
Location: Montevideo, UY
Posts: 4
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oil return lines that run vertically inside cylinder 74 HD Ironhead Sportster 1000cc
After boring the 2 new cylinders, for a 1974 Ironhead Sportster 1000cc, we discovered that we must make the oil return lines that run vertically inside the cylinder wall.
How could i know the correct way to do them (long and deep)? and if anybody have some pictures of a correct oil return lines in each cylinder.
Thanks.
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11-19-2011, 05:54 PM
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#2 (permalink)
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Banned
Join Date: Oct 2011
Location: deep south
Posts: 579
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Check your personal messages for
Link to tech guide
Last edited by nortster; 11-20-2011 at 09:51 AM.
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11-20-2011, 08:46 AM
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#3 (permalink)
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Retired citizen
Join Date: Jun 2009
Location: Pt. Wash.,WI
Posts: 10,690
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If your cylinders got over-bored to the point that the oil return holes got exposed I suspect your cylinders are now junk . The early 1000s were actually over-bored 900s and could only be bored an extra .020" more ! Check your cylinder bores against the service manual spec for your year and model bike .
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11-20-2011, 12:22 PM
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#4 (permalink)
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Junior Member
Join Date: Nov 2011
Location: Montevideo, UY
Posts: 4
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They are not over bored, they are new
We instal new cylinders but we dont know how to make the oil return lines, that run vertically inside the cylinder wall.
That our problem now. We dont want to make them wrong.
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11-20-2011, 12:26 PM
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#5 (permalink)
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Retired citizen
Join Date: Jun 2009
Location: Pt. Wash.,WI
Posts: 10,690
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Quote:
Originally Posted by imorixe
After boring the 2 new cylinders, for a 1974 Ironhead Sportster 1000cc, we discovered that we must make the oil return lines that run vertically inside the cylinder wall.
How could i know the correct way to do them (long and deep)? and if anybody have some pictures of a correct oil return lines in each cylinder.
Thanks.
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????
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Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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11-20-2011, 05:10 PM
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#6 (permalink)
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Senior Member
Join Date: May 2011
Location: Saskatchewan Canada
Posts: 542
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Quote:
Originally Posted by SCHMIDTYS
????
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Yeah... Heh... I'm with you.
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THIS IS MY HARLEY, THERE ARE MANY LIKE IT BUT THIS ONE IS MINE.
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11-20-2011, 06:12 PM
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#7 (permalink)
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Banned
Join Date: Oct 2011
Location: deep south
Posts: 579
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Quote:
Originally Posted by SCHMIDTYS
If your cylinders got over-bored to the point that the oil return holes got exposed I suspect your cylinders are now junk ....
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Am out of date probably, but;
We used to send deeply gouged or otherwise "ruined" cylinders out to be bored still larger and a sleeve pressed in.
(wonder if LA sleeve co. is still in business)
Welding the old factory oil returns and relocating/drilling new may also be better left to a shop.
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11-21-2011, 06:07 AM
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#8 (permalink)
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Junior Member
Join Date: Nov 2011
Location: Montevideo, UY
Posts: 4
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So you recomend me buying somthing new?
Nobody have the measures were i must do the holes, inside the cylinder? Im not going to do them. i going to send them to make the holes, to the same company that bored the new cylinders. Please notice that i am in Uruguay. Thanks.
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11-21-2011, 06:25 AM
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#9 (permalink)
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Senior Member
Join Date: Sep 2008
Location: Munnsville, N.Y.
Posts: 947
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I'm at a loss here.
We've returned the oil from the head to the crankcase via external lines in larger bore applications, but for an OE bore, the internal lines as they come from the manufacturer are absolutely fine. 
Scott
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"Clyde played electric bass, he played it with finesse and grace."
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11-21-2011, 06:42 AM
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#10 (permalink)
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Retired citizen
Join Date: Jun 2009
Location: Pt. Wash.,WI
Posts: 10,690
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Racers have been installing outside oil lines and removing fins forever .
I'm wondering why new cylinders would have to be bored out in the first place .
We used to have a place In Plymouth , WI that resleeved cylinders for us untill it got cheaper to just buy new cylinders !
I'm wondering if the PO means sizing the new cylinders to the new pistons ?
Now I'm wondering which company the PO bought the new cylinders from ? OEM ???
Lottsa questions remain on this one ????
Again the early ironhead 1000s were overbored 900s from the factory , that didn't leave much meat for the rebuild overbore , .020" max if I remember correctly . That equates to .010" total metal removal .
__________________
Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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