Question about Mazda B3000

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A clicking sound is coming from my mazda b3000 engine when it is running

When the engine is running a clicking sound can be heard

Posted by radrof on

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ZJ Limited

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  • Mazda Master
  • 17,970 Answers

Check this information about "engine noses"...

ENGINE CLICKING NOISES
A 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 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.

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Posted on Aug 17, 2012

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5 Related Answers

mcgyver468

Mark L. Roberts Jr.

  • 710 Answers

SOURCE: engine like is on ,monday i heard i clicking noise in the fuse box under dash

That clicking sound could be a bad relay clicking on and off. Find it by putting a screwdriver handle to you ear and touching each relay until you find the one making all that clicking. Replace it.Good luck and be safe

Posted on Apr 23, 2009

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Anonymous

  • 49 Answers

SOURCE: I need a fuse diagram for a 1999 mazda b3000 truck

Here ya go!
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Posted on Feb 11, 2009

emissionwiz

Marvin

  • 85239 Answers

SOURCE: fuse box for 1998 mazda b3000

There are really 2 boxes
Passenger compartment fuse panel
The fuse panel is located on the left
hand side of the instrument panel
facing the driver’s side door. Pull the
panel cover outward to access the
fuses

Power distribution box
The power distribution box is
located in the engine compartment
near the battery. The power
distribution box contains
high-current fuses that protect your
vehicle’s main electrical systems
from overloads.

Posted on Jun 01, 2009

Anonymous

  • 29 Answers

SOURCE: Mazda mx3 clicking when cold

This is because the oil hasn't circulated in the HLA (hydrolic lash adjusters) that is ontop of the valves/springs under the cam. Once they are full with oil, the clicking stops and they opperate properly! Try running a thicker oil, other than that it's not a big problem unless the ticking is very loud or doesn't stop after it's warm.

Posted on Aug 09, 2009

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inspectmycar

Chris Biddle

  • 233 Answers

SOURCE: 94 mazda B3000 3.0L cylinder head torque specs

Step 1 torque to 59 ft pounds
2. Loosen one full turn
3. 37 ft pounds
4. 68 ft pounds

Use torque sequence below
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Posted on Sep 17, 2009

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