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Engine valves rattling can they be adjusted? - 1997 Toyota RAV4

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Posted on Mar 16, 2011

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How do you adjust the values on my jeep wrangler 4.0 6cyl


as they are hydulic you should not have to adjust them,if they are rattling,it's usually due to poor oil change history,try engine flush and you may have to remove sump afterwoods if the gunk blocks up the oil pickup,filters block and unfiltered oil then circulates throughout engine and makes lifters noisy,to check hyd lifters you need a "bleed down bar"to compress lifter and measure gap between rocker and valve,if it does have adjustable rockers then it's done with engine idleing with rocker cover off ,back off nut till it rattles,thentighen it down till it stops and then 1/4 more turn

Jun 22, 2014 | 2000 Jeep Wrangler

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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

1 Answer

1987 toyota truck rattle between 1000 and 1500 rpms


Hi Lucas, What engine is fitted? If the engine is petrol, the rattling sound you have heard could well be an effect named 'pinking.' Its usually caused by the ignition timing being out of adjustment and related to the octane rating of the fuel. The ignition timing is set with a stroboscopic timing light. the ignition timing is set at 10 degrees before top dead center. Regards John

Feb 26, 2013 | 1987 Toyota Pickup

1 Answer

I have a 2004 civic making loud rattling noise when i start it or step on gas


that would be your connecting rods or valves rattling if its your valves they just need more oil or adjusting and if its your connecting rods its a spun crank bearing and need for the crank to be replaced along with that one rod and all bearings in the lower part of your engine

Jun 22, 2012 | Honda Civic Cars & Trucks

1 Answer

My dodge ram 2500 cummins is making a rattling noise when its idling


Depends what the rattling is really... If it's the engine , could need a valve adjustment... I've also heard of torque converters make a rattle when going bad, but only when in drive or reverse

Apr 08, 2012 | 2004 Dodge Ram 2500

1 Answer

Valve settings on a 1992 dodge dakota v6 engine


You should have hydraulic lifters, unless someone changed them along the way. Normally nobody puts solid lifters in a vehicle that is a driven on the street daily. That being said, the normal adjustment for hydraulic lifters is normally take all clearance out of rocker arm to lifter plus an extra 1/2 to 3/4 turn. I used to do this with the motor running, I would adjust it tighter till it quits rattling and then tighten an extra 1/2 turn. If the lifters are bad, however, the rattling will never go away. I hope this helps.

Dec 27, 2011 | Cars & Trucks

2 Answers

Is valve adjustment a part of normal maitenance on Suzuki Esteem


When you hear some tapping, that's why you need -valve adjustments. At 137,000miles you probably need more than that to continue your trouble-free drives.

Nov 12, 2009 | 2000 Suzuki Esteem

1 Answer

Rattle noise on cold startup from timing cover


That noise comes from the valves.
Your engine has hydraulic valve play adjusters. There is too much play when there is no or low oil pressure ( when starting thus. )
You can clean out the circuitry adding a quarter to a half liter of ATF-oil in your engine oil ( please change your engine oil ). Should solve the problem in a few times.

Oct 31, 2009 | 2005 Suzuki Forenza

1 Answer

Do 1991 L series subaru legacy wagons have adjustable valves?


This model does not and uses a hydrallic lash adjuster that works something like the old lifters did. Generally when these collapse or lose hydrallic pressure,a rattling occurs in the valve train. Most generally this is a sign of an oil pressure deficit and may require a new oil pump then hopefully all lash adjusters will pump back up and close the rocker to valve clearance stopping the rattle.

Sep 12, 2009 | 1991 Subaru Legacy

1 Answer

Lifter valve trouble (maybe) on 1983 malibu


Hi there,Sounds like the valves are over tightened.You'll have to pull the valve covers off to adjust while its running to adjust them right.Another way you can test it is to give it a compression test to see if the valves are either staying open to long or closed to long.While its running and covers off you will get some oil spray so have some clothes ready.Now to eack valve you will have to loosen it until it starts rattling and then slowly tighten until rattle is gone and then another 1/4 turn..Do that to all of them then your valves all will be adjusted.Also double check firing order to insure correct timing..Hope this helps you and have a great day

Apr 01, 2009 | 1983 Chevrolet Malibu

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