Question about 2004 Harley Davidson FXDWG - FXDWGI Dyna Wide Glide

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Noise on left side of motor , low idle knock or slapping sound

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  • indian_dan_1 Oct 22, 2010

    I found the problem myself the compensator nut had loosened off on the primary chain on the front . Cleaned it up put locktight on the threaded part of the nut , tightened to 165ft lbs . no more knock or vibration .

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Hi, My first guess would be that you lost the roller bearing on the end of a tappet. I've heard those things knock so loudly that it sounded like something on top of the piston. These rollers are a weak spot in the Harley engine design in my opinion. I've seen them go bad in as little as 13,000 miles. But, I've also seen original tappets running in an engine with 75,000 miles on it. Usually, if they are going to give trouble, it occurs at about 25-30 thousand miles. They are especially prone to failure if an aftermarket high performance camshaft has been installed in the engine.

The problem is that the damage is not limited to just the tappet. It always destroys the camshaft. The lobe that the roller runs on is always scarred up badly. I've seen it cause a valve to get bent as well. If this is the problem, count on pulling the rocker boxes, the tappet blocks, and the gear case cover (nosecone), and possibly the heads.

Posted on Oct 05, 2010

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My murray lawn mower has a knocking sound when it is on


Check oil level in engine, may be low
Use standard unleaded fuel, never ethanol blend.
Crankshaft big end bearing may be worn out.
Balance weights in motor may be loose.
Bore may be worn and noise is piston slap.

Aug 18, 2015 | Murray Garden

1 Answer

Makes knocking noise that sound like something is loos banging only when jeep warms up and only in gear


TROUBLESHOOTING ENGINE NOISES
A KNOCKING SOUND IN THE ENGINE IS MOST LIKELY CAUSED BY ONE OF THE FOLLOWING
1. PISTON SLAP: Makes a sharp metallic noise. Idle engine and short out each cylinder plug. The noise will disappear when plug with bad piston is shorted. Noise will also disappear at acceleration. This can be caused by worn or out of round cylinder, or broken piston ring. Correct problem by re-boring cylinder and/or replacing piston.
2. VALVE NOISE: Makes clicking or rattle noise. Caused by excessive wear on valve stem or lifter, out of adjustment, or stuck valve. Correct by adjusting valve clearance, replace worn valve or lifter, regrind cam, replace valve guide and /or valve. A stuck valve can sometimes be loosened by passing oil through the carburetor while engine is running.

3. ROD BEARING KNOCK: Makes sharp metallic noise similar to a piston slap. Detection is opposite of piston slap. Rod knock is not heard at idle. Knock becomes louder as engine speed is increased. Caused by excessive rod bearing clearance. Correct by adjusting rod bearing clearance to .0015 inches by removing shims. May require re-pouring rod bearing.
4. REAR MAIN BEARING KNOCK: Makes dull knocking or thud noise. Detected at speeds between 20 and 50 MPH. Knock will normally decrease or disappear while pulling or decelerating. Noise will be detected the loudest at normal driving speed, when not pulling or decelerating. Correct by adjusting bearing clearance to .001 to .0015 inches. If knock is excessive, crank should be checked for out of roundness. May need to re-pour all main bearings to correct.
5. TIMING GEAR KNOCK: usually the most difficult to diagnose. If gear is loose or badly worn it will knock in all ranges. Run engine slightly above idle speed. Slowly open and close throttle. Knock will continue to be present, but just as engine slows down knock will become a slight rattle. Remove timing pin and reinsert into timing hole on timing gear cover. Press timing pin tightly against timing gear and accelerate slightly above idle. Knock will significantly be reduced or disappear. Correct by replacing both timing gear and crank gear as a matched set. The two gears should have a backlash clearance of .003 to .004. If more than .009 inch backlash, an oversize (.005) timing gear should be installed.
6. WRIST PIN SLAP: This can not be detected by shorting out the cylinder plugs. Rapidly accelerate and decelerate the engine speed. The engine will pass through a certain speed range when the wrist pin will rattle at about the same pitch as a valve tappet noise. This can be corrected by installing a new wrist pin bushing in the rod or new wrist pin f badly worn. Wrist pin should fit the piston and connecting rod with a tight metal to metal fit. The pin can be pushed into the piston and rod with a slight pressure of the hand. Pin to rod clearance is .0003 to .0005 inches.

Dec 07, 2013 | Jeep Cars & Trucks

1 Answer

Making knocking sound


A KNOCKING SOUND IN THE ENGINE IS MOST LIKELY CAUSED BY ONE OF THE FOLLOWING
1. PISTON SLAP: Makes a sharp metallic noise. Idle engine and short out each cylinder plug. The noise will disappear when plug with bad piston is shorted. Noise will also disappear at acceleration. This can be caused by worn or out of round cylinder, or broken piston ring. Correct problem by re-boring cylinder and/or replacing piston.
2. VALVE NOISE: Makes clicking or rattle noise. Caused by excessive wear on valve stem or lifter, out of adjustment, or stuck valve. Correct by adjusting valve clearance, replace worn valve or lifter, regrind cam, replace valve guide and /or valve. A stuck valve can sometimes be loosened by passing oil through the carburetor while engine is running.

3. ROD BEARING KNOCK: Makes sharp metallic noise similar to a piston slap. Detection is opposite of piston slap. Rod knock is not heard at idle. Knock becomes louder as engine speed is increased. Caused by excessive rod bearing clearance. Correct by adjusting rod bearing clearance to .0015 inches by removing shims. May require re-pouring rod bearing.
4. REAR MAIN BEARING KNOCK: Makes dull knocking or thud noise. Detected at speeds between 20 and 50 MPH. Knock will normally decrease or disappear while pulling or decelerating. Noise will be detected the loudest at normal driving speed, when not pulling or decelerating. Correct by adjusting bearing clearance to .001 to .0015 inches. If knock is excessive, crank should be checked for out of roundness. May need to re-pour all main bearings to correct.
5. TIMING GEAR KNOCK: usually the most difficult to diagnose. If gear is loose or badly worn it will knock in all ranges. Run engine slightly above idle speed. Slowly open and close throttle. Knock will continue to be present, but just as engine slows down knock will become a slight rattle. Remove timing pin and reinsert into timing hole on timing gear cover. Press timing pin tightly against timing gear and accelerate slightly above idle. Knock will significantly be reduced or disappear. Correct by replacing both timing gear and crank gear as a matched set. The two gears should have a backlash clearance of .003 to .004. If more than .009 inch backlash, an oversize (.005) timing gear should be installed.
6. WRIST PIN SLAP: This can not be detected by shorting out the cylinder plugs. Rapidly accelerate and decelerate the engine speed. The engine will pass through a certain speed range when the wrist pin will rattle at about the same pitch as a valve tappet noise. This can be corrected by installing a new wrist pin bushing in the rod or new wrist pin f badly worn. Wrist pin should fit the piston and connecting rod with a tight metal to metal fit. The pin can be pushed into the piston and rod with a slight pressure of the hand. Pin to rod clearance is .0003 to .0005 inches.

Dec 06, 2013 | Nissan Cars & Trucks

2 Answers

Motor sounds like a bunch of Indians trying to get out.


sounds to me like you could have damaged the oil pump, running low on oil can cause numerous things to fail.. possibly spun the rod bearings and they are beating on the crank. I wouldn't start it, but if the noise is in the bottom I would drop the oil pan.

Apr 03, 2013 | 1993 Ford Crown Victoria

1 Answer

Knocking noise


Sounds like rod bearings, but may be piston slap. Add some motor honey to oil to thickn it up and see if that helps.

Oct 26, 2012 | Peugeot 306 Cars & Trucks

1 Answer

I have a 1997 2.5 jeep wrangler.when you first start the engine it runs and sounds fine, then after about 20 seconds it begins to have a knocking sound only at idle. when you press the gas you cant hear...


It may be piston slap. This is caused by either engine wear with the piston bores being too large for the pistons, or by poor manufacturing tolerances, or a combination of both.

To test for this, start the engine up first thing in the morning and run it for about thirty seconds while you listen carefully and memorise the sound and intensity. Turn the engine off quickly, remove the spark plugs and put two squirts of motor oil into each cylinder. Reinstall the plugs, start the engine up again and listen. If you have piston slap the noise will have been greatly reduced or even eliminated for about thirty seconds seconds and then returns.

The fix is to rebuild or replace the engine, but if it works just fine then don't worry. Many slappy engines keep going for tens of thousands more mile. The fact that your knocking is only at idle suggests your crankshaft is not to blame.

Sep 26, 2010 | 1997 Jeep Wrangler

2 Answers

AT IDLE MY 2005 HARLEY FATBOY HAS A INTERMITTENT KNOCK SOUND BUT WHEN OFF IDLE THE NOISE SEEMS TO GO AWAY


could be any thing doing this,,,piston slap! piston pin bearing worn! even big end or main bearings worn! or it could be just the way the motor sounds at low reves,,,(if its not broken,,,dont fix it!) just ride it and enjoy life

Jun 29, 2010 | 2005 Harley Davidson FLSTF - FLSTFI Fat...

1 Answer

There seems to be a knocking noise in the engine at low rpm and at idle. sounds almost like a piston slap or rod knock. Can you share any solution or is this a problem ?


I'm thinking this is a escort,correct me if i'm wrong. It has a 2.0 liter motor.They would get loose valve seats,and make noise,and cause motor damage.Take it to your local repair shop, that can diagnosis it properly.I might cost more than the vehicle is worth.Good luck!

Nov 12, 2009 | kawasaki ZX-14 Motorcycles

1 Answer

Knocking (Pinging) noise heard when car is in drive


check the vehicle knock sendor, are u using the right grade of gas, and oil for u temp zone

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Engine knocking.


Hi,my 92 prado started making a knocking sound recently,we couldn't pin it down to one spot in the engine.
The knocking was constant at low revs and then disapeared.
Turned out to be the tourque converter knob had bust of and eventually destroyed the fly wheel and the transmission pump.
Definatley check under top cover and also drop off the sump to check for loose nuts etc.
hope this helps.

Dec 27, 2008 | 1992 Toyota Land Cruiser

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