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Loss of opl pressure

This is a just rebuilt 1974 850 cc motor. at start up and at speeds below 30 mph oil pressure is 45 to 60 psi but ten minutes at freeway speeds it drops drastically to less than 15 to 5 psi temp rises to about 20 to 30 degrees above normal

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Might be the weight of oil you are using or brand. I've heard that Harley sportsters cant run amsoil because it thins to much once its warm and the oil pump can't make decent pressure on it. just a thought.

Posted on Jul 12, 2013

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Posted on Jan 02, 2017

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SOURCE: valve noise when the motor is hot from running at high way speeds

Go to 10w40 in the gearbox. The hydraulic lifters are balking at the 10w50. The oil needs to be liquid enough to 'inflate' the lifters properly. 50 weight oil is a bit to thick. It might take two oil changes to clear the 10w50 out of the lifters.

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Posted on Mar 28, 2009

  • 16 Answers

SOURCE: low oil pressure at rocker box

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

  • 653 Answers

SOURCE: oil leaking

The fact that the air filled upper portion of the shock is still holding air doesn't change the fact that the o-ring seals in the oil filled portion at the bottom of the shocks are going bad. You are better off replacing both of them soon before it affects ride comfort and handling.

Posted on Jul 15, 2009

  • 523 Answers

SOURCE: triumph bonneville t120 1968 low oil pressure

Several things could be at play: Type or weight of oil, confirm this first. Not to question the rebuild but if not done properly (improper bearing clearances, too large) the oil pressure can be low and perhaps a worn pump too. While I am unfamiliar with the engine and oil pump loaction I'd check it if your able too. You'll probably need a good set of feeler gauges to check this if these clearances are outside of the pumps limits the pump will be less able to create pressure; this is of course more evident when the oil heats up.
Another cheap fix is to use a heavier weight oil.
Hope this might help,

Posted on Aug 21, 2009

  • 1508 Answers

SOURCE: Oil light comes on and

try a new oil pressure sender,
you could also fit a gauge into the oil sender hole and see if it has oil pressure.
There could be other reasons like a faulty oil filter, problem with bypass in oil pump, or a shorted or broken wire causing the shut down and light on.
If it is actually losing oil pressure and shutting down it would probably be making strange noises

Posted on Jun 10, 2011

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