Question about 2000 Harley Davidson FXD Dyna Super Glide

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I have a 99 FXD twin cam88 that has excessive valve train noise at idle only. seems to loose compression and stalls after a sraping noise comes from the top of the front cylinder. I took off the rocker cover and cranked it but didn't notice any bend in pushrods or seizure of valves or rockers. any ideas? thanks

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The excessive valve train noise at idle could be caused by worn out cam chain tensioners. How many miles are on this machine?
The other issue may or may not be related. I would do a compression test first to be sure there isn't a problem in the cylinder itself. Providing the compression comes up good, I think I would be looking at the cam chain tensioners next. I am assuming that this is a stock engine and has not had the chain tensioners serviced or changed yet. The Factory recommends changing the chin tensioners every 35,000 miles or so or when they start making too much racket.

Posted on Nov 04, 2010

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2006 cts 2.8 making loud ticking noise ,running rough and has misfire codes po300,301,303,305


codes p 300 is a random/ multiple misfire===causes spark plugs---HT leads ---injectors/s--ignition coil/s--low compression---wiring
codes p 301,303,305 are misfires detected for no 1,3 5 cylinders === causes listed are engine mechanical fault---wiring---ignition/fuel systems ---injectors---ECT/MAF sensors---ECM
You do not mention if this is a v6 engine in which case no 1,3 5 will be all in the one bank head
With the loud ticking noise that amounts to a mechanical fault associated with that bank
could be loose valve seat inserts , cam lobes failure or cam follower failure or hydraulic lifters problem even loose cam shaft bearings / caps
I would be inclined to remove the rocker cover and check for metal , loose bolts , excessive valve clearance before I went plugs etc
the main indicator for the answer is the loud ticking noise which indicates a valve train problem which will cause the rough running

Jan 15, 2016 | Cars & Trucks

1 Answer

Loud valve train


That or very worn cam bearings. Or both.
Usually if the oil pump is failing you will loose oil pressure as the engine warms up. Noise at first is excessive wear in the engine parts.
The noise goes away as soon as oil reaches the worn parts.

Jan 30, 2014 | 2006 Subaru B9 Tribeca

1 Answer

My 1999 Harley FXD makes a scraping noise and seems to loose compression and stalls at idle only. Noise seems to be coming from the top of the front cylinder. Runs fine under load. I removed rocker cover...


The "scraping noise" is the crankcase vent venting the pressure out of your engine as it runs. In 1994, Harley moved the crankcase vent to the heads with is why most mechanics referred to bikes of this year model and later as "head breathers". The two large bolts that hold your air filter onto the engine's heads are hollow and that's what the vented air comes through. If you've replaced your stock air filter with a SE or aftermarket unit, you may be able to hear the vented air better due to the reduced restriction of the air filter.

Now, excessive crankcase pressure will increase the noise that you're hearing. This is caused by ring blowby is the rings are worn. My suggestion would be to have a compression or better yet, a leak down test done on the engine to determine the condition of the rigns. It may be time to replace the rings.

As for the stalling, I doubt that it's loosing compression. It's probably the idle speed is adjusted too low or the carb needs going through and a bit of tuning done to it.

If it''s fuel injectied, you'll need to take it to a shop that can reset the idle speed and such as it's all done electronically.

Good Luck
Steve

Oct 15, 2010 | Harley Davidson FXD Dyna Super Glide...

1 Answer

Have a B&S, Vanguard, 23HP motor, model 386777 with 300hrs on it. Motor starts and runs fairly well, but a fair amount of smoke is being emitted from air intake. Very evident with air cleaner removed....


sounds like you have a bad set of rings on one cylinder,or a bad valve set.
the stronger compression cylinder will burn richer due to the fact that the lower compression cylinder isnt pulling a hard enough vacumme to draw in all the fuel that is dumped into the intake.when the good cylinder makes it intake stroke it pulls in the excess fuel and a fresh amount from the carb.

im leaning more towards the valve train on the bad cylinder due to the white smoke comming from the carb,if the intake valve isnt seating properly,you will have compression escaping,back feeding through the intake.but yoy should hear a popping along with the smoke,everytime the engine fires that cylinder.
hope this info helps you.

4 stroke
#1 intake stroke
exhaust valve closed,intake valve open.as the piston is on its way to the bottom of the bore,it creates a vacumme.drawing in the air/fuel mixture from the carb.when the piston hits the bottom of its downward travel,the intake valve closes,then the next stroke comes into play.

#2 compression stroke
after drawing in the air fuel mixture,the intake and exhaust valve are both closed.the rotating momentium pushes the piston back up the cylinder,compressing the air/fuel into the cylinder.

#3 power stroke
(depending on the timing)when the cylinder reaches top dead center (tdc)in the bore.the spark plug ignites the fuel,which causes the air/fuel mix explode.that explosion forces the piston back down into the bore.when the piston travels down,this stroke is completed.

#4 exhaust stroke
after the power stroke,the piston then travels back up the bore,while opening the exhaust valve.the moving pistion then pushes the exhausted air through the exhaust chamber and out the muffler.

then the cycle starts over again.
so if you have a valve thats not seating properly,on compression stroke you will have loss of compression,on the power stroke,loss of power....forcing that ignited fuel back through the valve that isnt seated corectly(if intake) you will get white smoke and a poping sound from the carb.on the exhaust stroke it will sent exhausted air back through the intake aswell.

once again i hope this helps,id dig into the valve train on that cylinder.

nick

Sep 07, 2010 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

Have a knocking that is happening in the rear cylinder...was wondering what would cause that... and also how much it would roughly cost to fix the problem.


Depends on what the problem is as to how much it will cost to fix it.
There are any number of things that could cause this problem. Since I'm not there to hear the noise, I'll just tell you what they are.

You could have a bad roller on a tappet. These seem to be a weak point on Harley Big Twins. However, the Twin Cam engine was designed to help minimize this problem by partially correcting the problem with poor valve train geometry that the Big Twins always suffered from. Look at the pushrod tubes on an Evo engine and Sportster engine. The Sportster has perfect valve train geometry where the Evo is all messed up. But, still the roller tappets on even the Twin Cams give problems. When this happens, they get an excessive amount of valve lash and the result is a very loud tapping in the head of the effected cylinder. Usually this takes out the cam/cams as well.

You could have lost a piston pin. This is highly unusual since Harley went to the standard piston pin locks instead of the spiral lock of years ago. Still it could have happened.

There are also a few other things that could have happened. A valve spring could have broken, or a valve keeper may have jumped out. It's difficult to tell without actually going into the engine.

Whatever it is, I hope it's not too bad.

Good luck
Steve

Jul 11, 2010 | 2003 Harley Davidson FXSTD Softail Deuce

1 Answer

Have a 20hp vanguard on a go-devil long tail motor. engin runs at idle speed then when i put the propeller into the water it stalls. if i pull the choke and give full throttle it will run some and backfire


These engines seem to have problems maintaining the correct valve lash settings. try taking the valve covers off and checking the valve/pushrod clearance.on tdc compression stroke it should be .001-.003 clearance. then check exhaust stroke tdc on exhaust stroke. clearance should be same on the other valve then. hope this cures your problem.

Dec 22, 2009 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Engine noise at idle speed


Sounds like it's time to adjust the valves. The noise you are likely hearing is due to valve train noise. I suspect you have loose valves. Also I would recommend making sure the carburetors are synchronized. If one side is off you will actually feel a roughness in the motor especially at idle.
When you remove the valve covers be sure to look for any dryness in the valve train. You want to make sure you're not having an oiling problem.
You'd be well off to just do a major tune up. Be sure to replace the spark plugs too.

Dec 18, 2008 | 2007 BMW R 1200 RT

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