Question about 2009 Harley Davidson FLHTCU Ultra Classic Electra Glide
Large variation on oil pressure between hot and cold engine. I realize pressure will drop as engine warms but how much is too much?
Posted by Anonymous on
Hi Anonymous, start by checking oil level in tank and make sure it is between the add and full mark. With engine at normal operating temperature 180-230 degrees and the use of a 10 micron synthetic media oil filter, oil pressure will be 30-38 psi at 2,000 RPM and 3-5 psi. at idle. The oil pressure light is designed to come on at 2 psi. or less. To accurately test oil pressure remove oil pressure sending unit and install known good oil pressure gauge that reads 0-50, there might possibly be some plumbing required for hard to access points. If you are out in the middle of nowhere and there is no cell phone service and your oil pressure gauge isn't working and your oil pressure light is burned out, despair not, you still have one last line of defense left HYDRAULIC LIFTERS, as long as those tireless workers are quiet, you have oil pressure, maybe not much, but enough to get you down the road at a slow to moderate speed using the least amount of RPMS as necessary. Good luck
Posted on Jun 10, 2015
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Posted on Jan 02, 2017
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
Drain the fuel either by siphening or removing the cross over tube at the front of the tank and letting it drain that way or just block off those cross over lines and leave the fule in the tank for removal.
0) remove seat
1) drain fuel
2) undo cross over line (bottom front of gas tank.
3) shut off pet **** and remove fuel line from pet ****.
4)there should only be 2 bolts holding the tank on, one at the top front of the tank and one at the back of the tank.
All in all a pretty easy (but possibloy messy) job.
Posted on Jun 06, 2009
camplate check valve sticking,good time for an upgrade SEcamplate,hydraulic camchain tensioners,high volume oil pump,comes as complete kit for about $420. add another $150 for adjustable pushrods and never worry about it again,or replace the existing component youd save maybe $180 bucks but youll be back
thats why they changed the camplate and tensioners in 07, I just did the complete conversion on an 02 heritage it costed with labor about 1100 in your case your looking at 7 to 800 dollars just to get you going for another 30 or 40,000 miles or less and then do it again Im for a 1 time fix myself
Posted on Apr 26, 2010
I'm going to address this post but I have to tell you that I have no experience with the oil pump on the Twin Cams but I've got plenty of experience on the earlier type pumps.
Most early Harley's exhibit the same thing your bike is doing. A Harley Davidson engine has a high volume low pressure oiling system. It will not hold oil pressure like a Japanese bike. The reason is the roller bearing construction in the bottom end. The shell bearings in the Japanese bikes will hold oil pressure but the roller bearing bottom end with the gaps between the rollers will not hold oil pressure. Additionally, the oil pressure switch for the oil pressure light turns the light off at 4 pounds of pressure. Most oil pressure gauges are not accurate enough to measure such a low pressure.
However, make sure you're using the correct oil. Harley recommends 20W50 oil. Their Syn3 oil is probably what came in your bike. It's is recommended for using in climates with maximum ambient temps of 100°F. If you have temps higher than that, you can go to straight 60 weight. Make sure the oil you use is rated for use in diesel engines. Look for the API code. It should say something like "SJ/CG". What you're looking for is the "C" rating. This is the diesel rating. Most standard motor oils today do NOT have the diesel rating unless you specificly look for diesel engine oil. The oil companies leave the additives for diesel use out of most engine oil now so you get better fuel mileage.
Your engine is equipped with hydraulic tappets. If your oil pressure gets too low, the tappets will collapse and the engine will start to rattle badly. You will know without a doubt that your oil pressure is too low. However, go talk to your local Harley dealer about your concern. Most dealers don't charge for answering questions.
Posted on Jul 04, 2010
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