Question about 1979 Harley Davidson XLS 1000
My 79 xls has low? pressure at the rocker box when hot. cold with 50w hd oil has 40 psi then when warm(after 5 min running) drops to 0. at 3500 rpm hot has approximatley 1 psi. is this normal or should i look for worn rocker bushings or weak pump? anyone please help cause i haven't had a clear answer from anyone!! thanx
The Ironhead Sportys have a tendency to do this when the Gerotor Gear Set is worn. These are the thin set of drive gears in the oil pump. HD Part # 26492-75. Do you have a problem WET SUMPING? This is when the oil drains from the reservoir into the crank case if the bike sits for a period of time and when you attempt to start it pukes oil from the breather tube. If so you need to check these gears. Gerotor Gear Sets inner/outer clearance should be .000 the shaft should have a clearance of .0005 and the feed gear height in the pump should be .011. Normal operating pressure when hot should be 4 psi at idle and 10-20 psi at 3500 rpm. The pumps generally have issues before the rocker bushings.
Posted on May 01, 2009
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Posted on Jan 02, 2017
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