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Gear knocking when changing gear - 220 Mercedes-Benz Cars & Trucks

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steve

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You have'nt mentioned age or mileage , could just be wear and tear , clutch could need replacing , would need a bit more info to be able to comment further

Posted on Jul 17, 2014

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I just changed the knock sensor on my lexus rx 300 now the second and third gear dont have a smooth change also gear all of a sudden is not going into the 4th gear


Knock sensor controls ignition timing. It should have no control on transmission shifting. Did you disconnect/remove anything else to access the knock sensor? Was the battery disconnected? If so, a relearn procedure may be required for trans module etc relearn shift points while you drive the vehicle

Jul 01, 2015 | 2000 Lexus RX 300

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V6 knocking noise


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 | Cars & Trucks

1 Answer

Noise from engine after changing from 5th to 2nd gear


It sounds like you have what is called pre ignition knock. Have a technician drive the car and see what they think.

Sep 13, 2012 | Cars & Trucks

1 Answer

I have a 99 mustang gt & I know it needs either a pilot bearing or throwout bearing, but it started making a knocking noise when the car reaches @ 2200 rpm & stops after I shift gears! Does not...


your description is not clear. the throwout and pilot bearing only work when the pedal is depressed. and dont make knocking noises, so rule that out. If the noise is when the car is moving and in gear, the trans maybe bad. makes noise in all gears at 2200 rpm? trans needs to come apart.

Sep 14, 2011 | 1999 Ford Mustang Cobra

2 Answers

I replaced the 2.73 gears with 3.42's and it makes a whining sound, and a knocking noise. I've checked the backlash and tried putting shims in, but it still makes the sounds.


why not go to the local salvage yard and buy a whole rearend with same gears as original or new gears but remember to change the drive gear on the end of the speedo cable or you will have the wrong speed

Jan 03, 2010 | 1989 Chevrolet Camaro

1 Answer

1992 Camaro RS 305 V8, Auto


A knock is not good. Does it change when you put the car in gear? Is it loud enough to hear at idle? If it changes in gear then it is a possible cracked flywheel. If not you can idle the car pull the plug wires 1 at a time to see which one changes the sound. This will tell you which cyl has the problem. If it changes pulling the wires then it is an internal engine problem, get ready to spend some money, sorry. Good Luck.

May 07, 2009 | 1992 Chevrolet Camaro

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