2005 chrysler 300-can hear the engine noises when the ride used to be more quiet?
Hi there:Check this information about "engine noses"...ENGINE CLICKING NOISESA
clicking or tapping noise that gets louder when you rev the engine is
probably "tappet" or upper valvetrain noise caused by one of several
things: low oil pressure, excessive valve lash, or worn or damaged
parts.First, check the engine dipstick to see if
the oil level is low. If low, add oil to bring it back up to the full
mark. Is the engine still noisy? Check your oil pressure. A low gauge
reading (or oil warning light) would indicate a serious internal engine
problem that is preventing normal oil pressure from reaching the upper
valvetrain components. The cause might be a worn or damaged oil pump, a
clogged oil pump pickup screen or a plugged up oil filter. Using too
thick a viscosity of motor oil during cold weather can also slow down
the flow of oil to the upper valvetrain, causing noise and wear.COLLAPSED LIFTER NOISEWorn,
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 NOISEIf 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 NOISEInspect
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 SOUNDUsually
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 ACCELERATINGThe
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
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