Question about 1998 Jaguar XJ8L

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XJ8 I have a 98 XJ8 real nice,but it's makeing engine noise, and I believe it's because of...(A) push rod (B) rocker arm ... are there both adjustable,so with that I thank you for your time

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  • rkkrup Oct 09, 2008

    I dont have a problem, but would liike to know when should change teh timing belt on my xj8 2004 jaguar, ie. in how many miles?

  • rlanderson May 07, 2009

    1998 JAGUAR XK8 ENGINE NOISE ON TOP SIDE OF ENGINE

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I think is time to replace your timing chain and tensioners this is really common on jags here it will show how to do the job.

http://jeg.serverhouse.com/Jag_docs/Timingchain.pdf

dssossg@aol.com

Posted on May 12, 2009

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A conservative cost for this timing repair is $1250 in Columbus Indiana, Eldon's Eurotech.

Posted on Oct 01, 2008

I thank you very much... for looking in to this issue for me. I guess I have to decide if I still want the car, or just get it fix. Once again I thank you.

Posted on Sep 28, 2008

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The Jaguar v8 does not have a rocker arm or push rods, this is an overhead cam type engine.
4 cams on top of the heads which are driven by the timing chains, which are driven off the crank.
If your noise appears from the lower end, the most common issue is a main bearing in which case the car will need an engine. (the bearings go bad due to lack of oil circulation, the oil pick up tube in the oil pan gets clogged)
If the noise is upper and the car seems to run rough then the upper timing chain tensioner has broken and the chain has jumped causing the timing to be off.
If you start the car and you have a bad upper noise then the chain could be broken and by running the car you definitely will have valve damage.
JPTCAT

Posted on Sep 27, 2008

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1 Answer

Rebuilt engine 3800 and getting a tapping/ticking sound at cold start. Brand new lifters rocker arms are not new.


Here are 3 causes for lifter tick!
Bad Lifter, Dirty Oil Deposits, Bent Push Rod, The rocker arms will make a noise if push rod clearance is not adjusted right. God-Bless! and hope this helps you!or the rocker arms may be worn.

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Were does a the push rods go on a 2003 pontiac astec


If you do not know where the push rods go. You should stop now and get a mechanic. The push rods are between the lifters and the rocker arms. They are internal parts of the engine.

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Why is there a ticking sound with engine idling?


push rods /lifters not getting oiled properly

Mar 28, 2015 | Cars & Trucks

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What causes engine knocking and stronger engine knocking at higher speeds?


Some details here:
COLLAPSED LIFTER NOISE
Worn, leaky or dirty lifters can also cause valvetrain noise. If oil delivery is restricted to the lifters (plugged oil galley or low oil pressure), the lifters won't "pump up" to take up the normal slack in the valvetrain. A "collapsed" lifter will then allow excessive valve lash and noise.

VALVE LASH NOISE
If you can rule out lubrication-related problems as a cause, the next step would be to remove the valve cover(s) and check valve lash. On older import engines, mechanical lifters require periodic valve lash adjustments (typically every 30,000 miles). Too much space between the tips of the rocker arms and valve stems can make the valvetrain noisy -- and possibly cause accelerated wear of both parts.

To measure (and adjust) valve lash, you need a feeler gauge. The gauge is slid between the tip of the valve stem and rocker arm (or the cam follower or the cam itself on overhead cam engines) when the piston is at top dead center (valve fully closed). Refer to a manual for the specified lash and adjustment procedure. Also, note whether the lash spec is for a hot or cold engine (this makes a big difference!).

On engines with hydraulic lifters, oil pressure pumps up the lifters when the engine is running to maintain zero lash in the valvetrain. This results in quiet operation. So if the rocker arms are clattering, it tells you something is amiss (bad lifter or worn or damaged parts) or the rocker arms need adjusting.

DAMAGED ENGINE PARTS NOISE
Inspect the valvetrain components. Excessive wear on the ends of the rocker arms, cam followers (overhead cam engines) and/or valve stems can open up the valve lash and cause noise. So too can a bent pushrod or a broken valve spring.

RAPPING OR DEEP KNOCKING ENGINE SOUND
Usually bad news. A deep rapping noise from the engine is usually "rod knock," a condition brought on by extreme bearing wear or damage. If the rod bearings are worn or loose enough to make a dull, hammering noise, you're driving on borrowed time. Sooner or later one of the bearings will fail, and when it does one of two things will happen: the bearing will seize and lock up the engine, or it will attempt to seize and break a rod. Either way your engine will suffer major damage and have to be rebuilt or replaced.

Bearing noise is not unusual in high mileage engines as well as those that have been neglected and have not had the oil and filter changed regularly. It can also be caused by low oil pressure, using too light a viscosity oil, oil breakdown, dirty oil or dirt in the crankcase, excessive blowby from worn rings and/or cylinders (gasoline dilutes and thins the oil), incorrect engine assembly (bearings too loose), loose or broken connecting rod bolts, or abusive driving.

Bearing wear can be checked by dropping the oil pan and inspecting the rod and main bearings. If the bearings are badly worn, damaged or loose, replacing the bearings may buy you some time. But if the bearings are badly worn or damaged, the crankshaft will probably have to be resurfaced - which means a complete engine overhaul or replacing the engine is the vehicle is worth the expense.

ENGINE PINGS OR KNOCKS WHEN ACCELERATING
The cause here may be Spark Knock (Detonation) caused by an inoperative EGR valve, overadvanced ignition timing, engine overheating, carbon buildup in the combustion chambers, or low octane fuel.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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2 Answers

Tikking noise coming from engine


Yes, you're right, those could be the cause. Also, possible it's a collapsed hydraulic valve lifter, if your car has hydraulic operated (from engine oil) valve lifters. At any rate, it sounds like something loose in the valve train-valve lifter with push rod engines; or cam followers {rocker arms) with overhead cam engines that push on the top of valve stems .
Check a repair manual to see if your engine has valves that can be and need adjusting. Engines with valve lifters do not require periodic adjustment for proper valve clearance. Engines with rocker arms do require checking the valve clearance every couple of years or so.

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1 Answer

Why rocker arms wont pick up oil in 1969 357 chevrolet


I'm not aware of a 357 engine in a '69 Chevy. I'll assume it's a 327. The rocker arms in that engine get their oil from the lifter through a hollow push rod. Make sure you can see through the push rod and the hole in rocker arm is clear. If everything looks OK you probably have a problem with the lifters.

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1 Answer

2001 grand cherokee 4.0l valve rocker torque specs


5 million made.
it's in the fsm book
posted here over 300 times.
are you asking , how to set rockers ?

chapter 9 page 27
------------------text fsm---------------------
INSPECTION
Inspect the pivot surface area of each rocker arm.
Replace any that are scuffed, pitted, cracked or
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Inspect the valve stem tip contact surface of each
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pitted.
Inspect each push rod end for excessive wear and
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Inspect the push rods for straightness by rolling
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A wear pattern along the length of the push rod is
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INSTALLATION
NOTE: This procedure can be done with the engine
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(2) Using Mopart Engine Oil Supplement, or
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bridge above each cylinder in their originally position
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(3) Loosely install the capscrews through each
bridge.
(4) At each bridge, tighten the capscrews alternately,
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torque.
(5) Install the engine cylinder head cover (Refer to
9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).

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1 Answer

What goes between the rocker arm and cylinder head on an early 350 chevy.Am re assembling an engine that someone else pulled down and they dont know.Is there some sort of saddle?


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Go to a local library and check out a Clinton Manual or similar for GM small blocks. Good Luck

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1 Answer

Need to know how to install headers on a 2003 impala. And how to set the rocker arms


Header install varies with brand and vehicle options. Best to get directions from the manufacturer. Some are easy, some need the motor lifted and accessory removal. On v8 Chevy engines there are two ways of adjusting lifters The "hot rod" method is to first adjust the push rods so you can turn them with your fingers before starting the engine. Move any that are on a lobe or ramp to the closed position when you do that.. Then with the engine running, loosen each 'till it gets noisy, then slowly turn it down till the noise stops. Non performance method is exactly the same but instead of stopping there, turn the adjustment 1/2 turn more after noise stops. Flat tappet or roller cams require using a feeler gauge and specifications of cam manufacturer. Rockers that are shaft or bridge mounted are not adjustable.

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Rocker arm come out on jeep chrysler 3.7 eng


A rocker arm is the arm that sits on top of the valve stem and connects to the push rods 'the push rods sit on the cam so when engine is running, the push rods go up and down in a timed sequence and with the rocker arms, open and close the inlet and exhaust valves. the rocker arm is located inside the valve(rocker)cover .If the rocker arm gets loose or comes out.
Check the nuts on the shaft which holds the rocker arms.either the shaft or nuts are got loose.They need to be tightened.Don't make it too tight or too loose.  Too tight,and they don't flutter right. Too loose,and they allow the rocker arms to wiggle out of whack. Other possibility can be  something is broken, bent, collapsed, or out of adjustment. 
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