Question about 1998 Jeep Grand Cherokee

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Valve/tappets?? heard a horrible tapping noise comming from engine earleir..driving through poland, germany and france back to uk..so pluued into hotel for night down the road from a jeep dealer/service in W Poland. we'll see in the morning...could it be a valve gone..tapping sounds metallic and runs with revs so obvio is fater with higher revs, onlt had to drive about 30k to get off motorway and into town so i hope it will live in the morning. any ideas what it could be/to do...?? many thanks

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  • 475 Answers

Sometimes valve springs can break for no reason.
You have to hear which side of the engine it is coming from.
Is coming from top, middle of engine?
The dealer will diagnose for a fee.

Posted on Oct 08, 2008

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Slight tapping noise from engine when accelerating when engine is warm.Started about 3 days ago but hasnt got any worse.Doesnt do it when cold.


tap usually associated with lifters when vehicle warms up oil thins out and a bad or worn lifter will make a tapping noise --other oil level low --oil needs changing --low level will starve rockers/push rods/and lifters which will also cause tap ---damaged /dirty{sludge oil can cause same problems

May 24, 2016 | Cars & Trucks

2 Answers

Valve tap cause


Most engines now use hydraulic lifters and they can leak a little, this causes space between then lifter and the push rod. This results in a tapping noise that goes away when they get warm or fill back up.

Mar 13, 2016 | 2004 Lincoln Town Car

1 Answer

How do I fix the tapping sound from the engine when i accelerate after it has reached running temperature


Adjust the valve tappets (yes, they 'tap') AKA Rockers or find out why the hydraulic self adjusting tappets don't work?

They transfer the downward motion of the cams on the camshaft to depress the valves. There is a thin clearance of about 8 thousandths of an inch with the engine cold. As the engine heats the clearance reduces. Over tightening causes the valve edges to burn, too much clearance causes tapping.

Manual tappets get quieter usually as the engine heats. Hydraulic tappets gets worse as the engine heats as the oil thins.

Oct 03, 2015 | Cars & Trucks

1 Answer

My 2004 v6 3.5 litre rodeo has been regularly serviced and maintained and now has 140000 kms on the clock but it has now developed a ticking sound which i thought would be the tappets and or valves but all...


look for obvious signs that the holden dealer did take off rocker covers and check/replaced shims for tappet adjustment you should have shims booked out on receipt if any were done. Alot of them dont do it because its very time consuming and a pain in the **** to do this job. This should have been done at 100,000km service. If the tapping noise is there constantly at idle and approx 1200-1500rpm and gets louder if you stab the throttle at this engine speed its a tappet or other engine noise(big end bearing), if the noise comes in and out at a constant engine speed idle and 1200-1500rpm your valve guides are worn. both of these were common for this engine.

Jan 07, 2011 | 2004 Isuzu Rodeo

1 Answer

I think a valve is sticky, a tappet noice is heard when the vehicle is started, it last only a few seconds. It also from time to time while driving make the same sound, it is a tappet making the noise,...


Hi Christo.
If you hear a tappet noise when the engine is started, and it goes away after a few seconds, if is not a very serious problem. What is happening is that you have Hydraulic lifters that maintain they're adjustment when the motor is not running. One of the lifters is collapsing. When you start the engine it pumps back up and works. Since lifters are at the top of the engine, you should that you use. It is called "Sea Foam". It is an excellent product to ad to the oil. It helps keep the engine cleaner and removes any moisture from the oil. It is great with hydraulic lifters.
Just so you know the difference. If you have a sticking lifter, you will have a constant tapping sound. I have used Sea Foam to un-stick lifters successfully.

IMPORTANT NOTE: A WORD ABOUT THE REPLACMENT OF THE KIA RIO TIMING BELT
.

It is recommend that the belt be changed at 60,000 miles.
I also recommend that the dealer do it.
If the car is under warranty you must tell the dealer to replace it. If you do not tell them to replace it, THEY WILL NOT.
If the belt breaks, it will DESTROY the engine.
Hope this is helpful to you. Happy New Year
Greetings, Mark

Jan 03, 2011 | 2002 Kia Rio

1 Answer

Hi, i have a toyota fielder 1.8cc with a some problem which has now come up. when i switch on esp in the morning after staying overnight, it produces some really annoying sound from the engine. when the...


If it is a 'squealing' noise it's probably the alternator/power steering drive belt. Before you turn on the engine in the morning, lightlt smear or spray some oil on the inside of the drive belt to lubricate it. If the squealing stops/disappears, then that's the fault ..

That squealing noise can be caused by an incorrectly tensioned belt, or a worn belt. Replacement is the only option.

The other frightening sounds can best be described as 'rattles' or 'tapping'. When a car stands overnight all the oil drains back into the sump (oil/pan).

There are two things (usually) that can be cause the rattle/tap:
1. Because the oil hasn't been pumped around the system, at start up worn big end bearings can rattle and tap on the crankshaft until the oil 'fills the gaps'. The tapping/rattling goes away as the engine warms and oil is pumped around the lubricating system.

A 'bottom end tapping' is a symptom of worn big ends (they are bearings at the bottom of the piston and fit around the crankshaft).

2. A rattle/tapping from the top of the engine can either be a worn camshaft or 'lazy tappets'. Again, when the engine warms and oil gets to the camshaft and tappets (also called 'hydraulic lifters) the noise will disappear.

If your car has this rattling/tapping noise - identify whether it is coming from just under the rocker box (ie the camshaft/tappets..) or the bottom end of the engine (big end bearings).

If the noise is coming from the top of the engine, try an oil change with a can of thick 'additive' included. A lazy tappet (lifter) isn't too much to worry about. A worn camshaft will affect the performance of the engine, though continue to do its job. An oil change with an additive included may help in quitening things down.

A bottom end tap/rattle (or 'knock') - the sooner that is sorted out the better.

Aug 16, 2010 | Toyota Corolla Cars & Trucks

1 Answer

I have a 94' Isuzu rodeo with a fast tap


alot of the 4clys had ajustable tappets that might need adjusting
V6 have tappets adjusted also but are shims on top of bucket over valve spring, this is hard to do as you may need to change shims to get correct valve clearances suggest dealer to do.
if the noise comes in and out while maintaining 1500-2000rpm when stationary it is possibly worn valve guides which is common on high km vehicle.(head repairs)

Feb 16, 2010 | 1998 Isuzu Rodeo

1 Answer

Fast tapping sound from top drivers side of engine when excellerating fast any ideas?


Tapping on the top of an engine is caused by excess valve tappet clearance.

You can have a worn rocker arm also.

Loose valve tappets usually are the loudest at a constant engine speed. when there is little torgue being produced.

A worn rocker arm with a bearing problem will make more noise during acclleration.

Feb 11, 2010 | 2005 Peugeot 405

1 Answer

Tappet ajustments for a 350 chev small block intake and exhaust


to properly adjust the valves on this engine, it requires you to run the engine (now be ready to make a mess), and the nut that holds the rocker needs to be loosened until there is a tapping noise heard. once you hear that tightened it back down until there is no noise and then 1/4 turn. do this for each valve and enjoy.

Nov 08, 2009 | Chevrolet Chevy Cars & Trucks

2 Answers

Engine tapping.......


Tapping and oil burning when both are together are tappet trouble. Get another mecanic to check. Any other part of the engine tapping would get a lot louder after a lot less miles. Sounds like tappets and valve stem seals are worn hence tapping and oil burning.

Aug 04, 2009 | Isuzu Cars & Trucks

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