Question about Harley Davidson FLHR - FLHRI Road King Motorcycles

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I would simply like to see a diagram of the oil feed system on a 2000 twin cam harley motor. I have replaced the lifters but I am still experiencing excessive noise. I would like to check for blocked/clogged oil passages. Oil pressure is excellent at the gauage.

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I'm sorry but I don't have an oilling diagram of a Twin Cam. The way I check for blocked passages to the tappets is while I've got the tappet blocks out, I turn the engine over using the transmission in high gear and turn the rear wheel with the plugs out of the engine. I watch for the oil to pump up and out of the engine. Now, since I don't work on the Twin Cam engines I'm going to say something here that I'm not sure about. See if the engine has a tappet oil screen like an Evolution engine does. It a plug with a very fine mesh screen thingy that all the tappet oil flows through. Keeps trash out of the tappets.

Have you ridden the bike since you replaced the tappets? Sometimes you have to ride them a ways to get all the air out of the tappets. I've had to ride them for ten miles to get them to quieten down before. Now, if you only have one tappet causing a problem, shut the engine down and pop the pushrod tubes immediately. Try to turn the pushrods with your fingers. If can turn one or two, there is your problem

Good luck
Steve

Posted on Aug 28, 2010

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1 Answer

Changed oil pump still low oil pressure 2004 twin cam


First off, if you are going by the idiot light, it COULD be a bad sending unit.
Either replace with a new one and check again, or hook up an oil pressure gauge (At 2000 RPM you should have 30-38lbs) to get a more accurate reading:

http://www.harborfreight.com/160-psi-dry-gauge-68249.html



IF is is still ACTUALLY low, pull the relief valve spring and make sure its clean and nothing it blocking it from seating correctly.

A cracked cam plate could also cause a loss of oil pressure.

Finally, make sure that the oil line fron the oil tank to the pump (feed line) isn't plugged.

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Why, why, why do people expect a decent answer if they do not give complete information, in this case MODEL YEAR?

In 1999, there was a change over from the Evolution engine to the Twin Cam engine.
This resulted in a total change of the oil pump.
Up through the Evo, the oil pump was mounted to the outside back end of the motor case, and could be remove - reinstalled/replaced fairly easy.
Starting with the Twin Cam, the oil pump was completely redesigned and move to inside the engine, so you have to go inside to change,

Either way, beings as the oil pump could be considered the "Heart" of the Harley's circulation system, you should know what you're doing if you plan on tackling this yourself.

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2 Answers

How to quiet lifter noise


It depends on how noisy the lifters are. Your engine is a pushrod engine and there will be some noise. Generally is just a small ticking noise due to running clearance in the rocker arm bushings and such. The tappets (lifters) in your engine are hydraulic just like the tappets in a pushrod automobile engine. If your tappets are really making a noise, like a can of rocks, you might not have enough oil pressure or the roller on the end of the tappet that runs on the cam may be bad. If the tappet is the reason for the noise, the only thing you can do is replace them. If the roller on the end locks up, it will damage the cam lobe that it runs on as well meaning the cam will have to be replaced as well.

Good Luck
Steve

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1 Answer

I have a 1996 1340cc harley davidson with a stuck lifter. Is there any easy tricks to get it unstuck.


By "stuck", I assume that you're talking about a collapsed lifter that will not pump up and is rattling. The only thing to do about a lifter doing this is to replace it. While you've got the tappet blocks out, check the rollers on the other tappets as well. This is the weak spot on most Big Twins, the tappets. This is why Harley designed the Twin Cam engine, to improve the valve train geometry and prevent premature failure of the valve train components. When you take the tappet blocks out, you need a set of "alignment pins" to make sure the tappet roller is running perfectly with the camshaft. They're made by Jim's tools and they aren't expensive. Be sure and clean out the tappet oil screen also. This needs to be done every other oil change.

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1 Answer

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Ok, I'm not exactly sure what the problem is on your Twin Cam but I can assure you that it is oil pump related. One the earlier models with the external pump, you had two pumps in one body. One pump was a "feed" pump that pumped oil into the engine. The other pump was a "scavenger" pump that pumped oil out of the engine back to the tank.

When Harley designed the Twin Cam engine, they employed a better design of pump inside the engine. It's located in the gear case along with the cams. I do not know too much about the Twin Cam engine as I specialize on the older Evolution, Shovelhead, and Panhead engnes. The older engines had a breather gear that used the crankcase pressure built up inside the engne to blow the oil from the crankcase into the gear case. I don't know if the Twin Cam still uses that method of getting the oil out of the crankcase and into the gear case.

So, with my limited knowledge of the oil pump on the Twin Cam, I'd say that this is the problem. You need to find someone that is familiar with the construction of the pump. It may be that the entire pump is bad or something as simple as a sheared pin.

Good Luck
Steve

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For valve train noise try these:
1. Low oil pressure caused by oil feed pump not functioning
properly or oil passages obstructed.
2. Faulty hydraulic lifter(s).
3. Bent push rod(s).
4. Incorrect push rod length.
5. Rocker arm binding on shaft.
6. Valve sticking in guide.
7. Chain tensioning spring or shoe worn.
8. Cam(s), cam gear(s) or cam bushing(s) worn.
9. Cam timing incorrect.

If it is a bottom end knock, an engine tear down may be in order.

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3 Answers

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Try these for valve train noise:

1. Low oil pressure caused by oil feed pump not functioning
properly or oil passages obstructed.
2. Faulty hydraulic lifter(s).
3. Bent push rod(s).
4. Incorrect push rod length.
5. Rocker arm binding on shaft.
6. Valve sticking in guide.
7. Chain tensioning spring or shoe worn.
8. Cam(s), cam gear(s) or cam bushing(s) worn.
9. Cam timing incorrect.

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1 Answer

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