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5th July 2012
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Biker
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Join Date: Aug 2006
Posts: 4 Sportster/Buell Model: 1200 Sportster/Buell Year: 1991 Other Motorcycle Model: sportster Other Motorcycle Year: 1977
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oil pressure problem
my friend has an 82 mdl ironhead sportster. lost oil pressure on guage off oil pump. oil light came on, looked in tank and oil is flowing into tank. leaking oil from under pushrod tappit guide blocks. could it have sheared the pins on pump shaft inside cam case cover. if so would it still somehow still be able to flow oil back into the tank?
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5th July 2012
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Land Speed Record
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Join Date: Mar 2009
Posts: 756
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There is two pins inside the pump, one on the pressure side and one on the return side, you can take the pump out of engine without having to take engine out of the frame.
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Heres at it and to it and to it again, if you don't do it when you get to it, heres by God hopen you never get to it to do it again.
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5th July 2012
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Senior Master Custom Bike Builder
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Join Date: May 2010
Location: Pottstown PA.
Posts: 5,142 Sportster/Buell Model: xlch Sportster/Buell Year: 1960
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78 ironhead is correct. you basically have 2,oil pumps in,one.feed,and,scavenge. [supply,and,return]. and you are fortunate with,82.you don't have to pull motor from frame to remove,oil pump.
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72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
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5th July 2012
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Senior Chief Master Mechanic 1st Class
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Join Date: Dec 2009
Location: Neither here nor there
Posts: 1,285 Sportster/Buell Model: XLCH (mongrel) Sportster/Buell Year: 1972
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If it's losing oil pressure at idle, you may just have the idle speed set too low. Is it losing oil pressure at 2000 rpm, then you probably have a pump problem.
But first - is you oil pressure gage bad? IH's tend to tear up gages on a regular basis. Don't start tearing things apart till you try another gage.
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BBRRAPPPP-snick-BRRAAAPPPP-snick-BBRRAAAPPPPP-snick-BBRAAAPPPPPP...
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6th July 2012
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Biker
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Join Date: Aug 2006
Posts: 4 Sportster/Buell Model: 1200 Sportster/Buell Year: 1991 Other Motorcycle Model: sportster Other Motorcycle Year: 1977
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thank you for the help. yes i told the owner to get a harley pressure switch and new guage. next is to make sure suction side that goes under starter is not mashed. then i will drop the pump and , am almost sure that a pin is sheared. gotta love these ironheads. mine is a 77.
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7th July 2012
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Senior Master Custom Bike Builder
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Join Date: Dec 2007
Location: Australia
Posts: 7,865 Sportster/Buell Model: XLCH 1000 Sportster/Buell Year: 1977 Sportster/Buell Model #2: 75 motor in Norton frame. Other Motorcycle Model: 42WLA 45, Harton, Narley Other Motorcycle Year: 1942
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If the pin is sheared you need to look for WHY it sheared. Some debris from something coming apart in the engine is the usual cause. Cam shims are prime suspects.
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