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How to replace rod bearing on chevy 3.8 in 99 camaro

Rod knocking

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Find another engine to put in

Posted on Mar 19, 2014

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2004 chevy impala 3.4 replaced rod bearings still

I hope you realize now that slapping a set of rod bearings into an engine fixes nothing. Nothing short of a complete rebuild will resolve your issues. Everything has to be measured and refitted. The block, crank and heads will have wear that needs to be dealt with.

Sep 15, 2014 | 2004 Chevrolet Impala

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2004 chevy impala 3.4 replaced rod bearings still rod Knock

Any machinist will tell you this will not work. You would have to remove crankshaft and have it machined, or just rebuild or replace the engine. You can ask any machinist. You did a lot of work for very little results. GOOD LUCK FRIEND.

Sep 16, 2014 | Cars & Trucks

2 Answers

I have a 2001 cadilac deville that has a wicked knock in the engine. it is a rod knock (from the sound) so i figure my options are to change the engine, or change the rod ect. I wanna know if the engine...

Thats going to be a tricky pull. you can actually do BOTH methods fro pulling that motor. Which ever is easier for you would be better.

As far as the rod knock. Rod knock simply means that the rod bearing has spun and is no longer a smooth surface. potentially, you could pull the motor and replace just that rod and bearing if the crankshaft was unaffected. the majority of the time, more work needs to be done. I think in this case, it may be cheaper to remove the motor and replace the crank and bearings. A replacement used motor will probably run about 1k if you can find one at a yard.

Apr 07, 2014 | 2001 Cadillac DeVille

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Making knocking sound

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

1 Answer

Maxima got a knocking noise by the power steering pump just replace the rod bearings and still knocks down by the power steering pum

You replaced the rod bearings, were they knocking?
Also, you have wrist pins that connect the piston to the rod, if one is bad it will knock and sound like a bearing.

Nov 25, 2013 | 2002 Nissan Maxima

1 Answer

Why is my camaro knocking when i hit the gas but when i let off it stops? is it because it needs a oil change, or the valves are loose or threw a barring?

Knocking under load is usually a failed rod bearing.
If it sounds more like a ticking noise it could be ignition timing or low octane fuel.

Sep 02, 2013 | 1993 Chevrolet Camaro

1 Answer

Motor knocking it knocks harder when accellerating

It could also be your piston rod bearings causing "(Rod Knock)". That happened to me on my 77 Firebird. I cannot remember if that had come on suddenly though.

Nov 18, 2012 | 2000 Chevrolet Chevrolet Monte Carlo SS

1 Answer

Sounds like a rod is knocking in the motor when idling and when accelerating.

most of the time when a rod starts knocking i cause of a bad rod bearing usually caused by either low oil pressure that lead to a failure or high rpm's in witch flatend out the tangs and spun the bearing you might get lucky and just replace the bearings and you might have to rebuild or replace the motor.

Dec 26, 2010 | Chrysler Town & Country Cars & Trucks

2 Answers

How do i stop my rods from knocking

There is no cure for that other than taking out the engine and tearing it down and replacing the rod bearings. There is probably too much clearance between the bearings and the crank journals do to worn bearings.

Dec 21, 2009 | 1997 Buick LeSabre

1 Answer


if you want to replace just one rod you should go ahead and rebuild the say the motor is still running fine?if you can pull the oil pan off you might be able to identify which rod is knocking,if so you may be able to replace just the bearings on that particular rod.that is if the crank isnt scarred.the only way to know if the crank is scarred is to pull the pan far as i know,the only way to get the pan off is to pull the motor, other al ternative is to buy a junk yard motor.which isnt a bad idea,if you have to pull the motor out anyway.

Jul 31, 2008 | 1999 Chevrolet Camaro

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