Engine M13A noises diagnostics - Revision history

Bosanek: Category adjustment

2019-02-21T13:53:47Z

Category adjustment

Bosanek: Removed the "Embryo" note

2018-05-16T05:10:28Z

Removed the "Embryo" note

Bosanek: General improvements

2018-05-07T05:59:36Z

General improvements

Bosanek: General improvements

2018-05-07T05:46:31Z

General improvements

Bosanek: Created a brand new article on M13A engine nosies diagnostics

2018-04-27T09:14:06Z

Created a brand new article on M13A engine nosies diagnostics

New page

{{intro-notes}}

{{embryo-note}}

== Introduction ==

If your M13A engine develops strange operating noises (like whirring, higher picthed buzzing, squealing, etc.), this article might help in the diagnosis.

The cause is usually one of these (from the most common to least common):
* One of two drive belts (lost tension or jut worn out);
* Some belt pulleys or tensioners;
* Alternator bearings;
* Radiator fan;
* Water pump;

== Diagnosis ==

There are several method of diagnosis. They are listed from the quickest / simplest to the most labor intensive or complicated ones.

"Stethoscope method":
* Take a long wooden or metal rod (for example a long screwdriver or a long wrench) and put it against various engine parts and accessory devices.
** Be careful not to "slide" the rod around!
* Then put your ear up to the rod and try to locate on which part the strange sound is pronounced the most.

Temporary belt softening method:
* Put a little chalk dust onto a belt.
** If the noise vanishes, the belt is probably worn out.
* You could also try this with WD40, but this is recommended only if you intend to replace the belt afterwards anyway.
** Reason: WD40 might spoil belt's friction properties for a long time.

Temporary bearing lubrication method:
* Spray wd40 into each pulley's or other bearings whilst the noise is being generated.
** Use the straw on the WD40 can to avoid WD40 getting on the belts.
*** If the noise changes when some bearing gets sprayed with WD40, you have found your main suspect.

Coarse elimination method:
* Take off the belt for the power steering, by slackening the bolts through the adjuster.
* Then turn on the engine and see if it is still noisy.
** If the noise is gone, it's either that belt or the power steering tensioner.
** If the noise is still present, then it's most likely something of the remaining parts from the above list.

Total elimination method:
* Take both driving belts off.
** Note: You should not turn the engine on while both belts are off, at least not for more than a couple of seconds.
* Then spin the alternator and water pump by hand and wiggle the pulleys to feel for play or any noise or coarse turning.
** If one is tight or has too much movement in the bearing, it becomes the main suspect.
*** The power steering pump pulley will be hard to turn, so you'll only be able to feel for excessive movement.

{{Edited}}
[[Category:Engine]]

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@@ Line 23: / Line 23: @@
-There are several method of diagnosis. They are listed from the quickest / simplest to the most labor intensive or complicated ones.
+There are several method of diagnosis.
 * Take a long wooden or metal rod (for example a long screwdriver or a long wrench) and put it against various engine parts and accessory devices.
 ** You should of course do this while the engine is running.
@@ Line 33: / Line 36: @@
-Temporary belt softening method:
+=== Temporary belt softening method ===
 * Put a little chalk dust onto a belt.
 ** If the noise vanishes, the belt is probably worn out.
@@ Line 40: / Line 45: @@
-Temporary bearing lubrication method:
+=== Temporary bearing lubrication method ===
 * Spray wd40 into each pulley's or other bearings whilst the noise is being generated.
 ** Use the straw on the WD40 can to avoid WD40 getting on the belts.
@@ Line 46: / Line 53: @@
-Coarse elimination method:
+=== Coarse elimination method ===
 * Take off the belt for the power steering, by slackening the bolts in the belt tensioner.
 * Then turn on the engine and see if it is still noisy.
-** It's okay to run the engine with this belt off as long as you like, because the engine will not be affected.
+** It's okay to run the engine with the power steering belt off as long as you like, because the engine will not be affected.
 *** You just won't have power steering and possibly air conditioning (if you used to have it).
-Total elimination method:
+If the running engine noise without the power steering belt is gone, it's one of these things:
-* Take both driving belts off.
+# Тhe belt itself;
-** Note: You should '''not''' turn the engine on while both belts are off, at least not for more than a couple of seconds.
+# The power steering belt tensioner pulley;
-* Then spin the alternator and water pump by hand and wiggle the pulleys to feel for play or any noise or coarse turning.
+# The power steering pump pulley (or even something inside the pump);
-** If one is tight or has too much movement in the bearing, it becomes the main suspect.
+# The air conditioning compressor pulley (if you have A/C);
-*** The water pump pulley will be hard to turn, so you'll only be able to feel for excessive movement (wiggling method).
 {{Edited}}
 [[Category:Engine]]