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Old 25th February 2010, 11:38   #1
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Question Water Pump Failure - Why and How?

A brand new water pump was installed in my Mahindra Classic just 3 months ago by Global Gallerie Service Center in Thane. This was when i had just bought my Jeep and went in for a complete diagnostic.

During last sunday's OTR, my jeep started developing a sound and minor vibrations were felt (while running and idle). On opening the hood, it seemed the pulley was loose.

However, there was no overheating and the temp needle stayed well below 80.

Showed it to my local mechanic and he said the water pump has failed. Now since i had just changed my water pump and i know that water pumps last for tens of thousands of kilometers, i didn't believe him.

So i went in for a second opinion to Milestone Mahindra workshop and they too just heard the sound and said water pump failure. On inspection they confirmed the bearings had gone for a toss.

How and why did a three month old water pump fail?

A quick google search gave me the following possible causes:

Quote:
Water pumps typically fail one of two ways: the shaft seal starts to leak, or the impeller inside breaks, comes loose or the blades erode and wear down (which is more of a problem with pumps that have plastic impellers).
There was definitely no leakage around the pump.

Another website says that over-tightening of the pulley and excessive strain of the belt can also cause failure. So then, how does one check for adequate tension of the belt?
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Old 25th February 2010, 11:57   #2
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Yup overtightening belt can put strain on the pump, usually a thumb check is good enough to check if its tightened properly
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Old 25th February 2010, 12:00   #3
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Default Water Pump

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Originally Posted by Tejas@perioimpl View Post

How and why did a three month old water pump fail?

A quick google search gave me the following possible causes:



There was definitely no leakage around the pump.

Another website says that over-tightening of the pulley and excessive strain of the belt can also cause failure. So then, how does one check for adequate tension of the belt?
Hi Tejas,

The Peugeot Water Pumps are Pre-Lubricated (Bearing).

The Pulley is attached to the impeller shaft with a Woodruff Key.

A few causes for failure.

1) Improper installation

2) Pulley fitted incorrectly

3) Too Much tension on the fan belt. A simple way of checking the fan belt tension is to push the belt down (WHEN THE ENGINE IS SWITCHED OFF), is to push the belt down with one finger, it should not depress more than 2cms. (Specifications are given of the fan belt packing)

or pinch the fan belt and shake it (Radiator to Engine Block), there should not be any play.

4) Use Good Quality spare parts
i) Fan Belt Fenner 1125 part No. for Peugeot
ii) Lucas-TVS water pump.
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Old 25th February 2010, 12:01   #4
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But will only over-tightening cause the pump to fail in three months?! If it is over-tightened way too much, shouldn't the belt have failed first?

EDIT:

Just saw your post Arka:

Will make sure the parts are correct. The previous pump was also Lucas and was fit by Mahindra Authorized Service Center.

Last edited by Tejas@perioimpl : 25th February 2010 at 12:04. Reason: see edit
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Old 25th February 2010, 12:06   #5
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Could the pump have been running dry. Chocked intake hose or something? Running a pump dry will surely ruin the pump.
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Old 25th February 2010, 12:14   #6
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Quote:
Originally Posted by Live To Jive View Post
Could the pump have been running dry. Chocked intake hose or something? Running a pump dry will surely ruin the pump.
Nope. Radiator was flushed and new pipes installed at the same time of installing the new pump. And no overheating at all.
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Old 26th February 2010, 08:35   #7
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Hey Doc, Looks like an installation issue. You gotta fight with the guy who fixed it.
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Old 26th February 2010, 09:32   #8
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Hey Doc, Looks like an installation issue. You gotta fight with the guy who fixed it.
Yep. Mahindra Milestone workshop is going to give me a report on why it failed and then i'm gonna take it up with Mahindra Global Gallerie.

But, fighting with a Mahindra Authorized Service Center is going to be an uphill task!!!
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Old 26th February 2010, 14:43   #9
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tightness/slackness of the accessory belts should always be checked at the midpoint of the longest belt, the procedure mentioned by Arka is correct, only thing to be noted is that the belt should be depressed between 1/2 to 1 inch (thumb rule), also if you have an option to measure the frequency gently tap the belt at the midposition and allow it to vibrate, the frequency of vibration can then be measured in Hertz. Also it needs to be mentioned that different manufacturers have different specifications, so it is better to stick to them.

Spike
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Old 26th February 2010, 15:27   #10
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Quote:
Originally Posted by SPIKE ARRESTOR View Post
tightness/slackness of the accessory belts should always be checked at the midpoint of the longest belt, the procedure mentioned by Arka is correct, only thing to be noted is that the belt should be depressed between 1/2 to 1 inch (thumb rule), also if you have an option to measure the frequency gently tap the belt at the midposition and allow it to vibrate, the frequency of vibration can then be measured in Hertz. Also it needs to be mentioned that different manufacturers have different specifications, so it is better to stick to them.

Spike
Spike, so will mahindra compensate me for a faulty job?

EDIT: Spike just kiddin... I know it's not your domain!

Last edited by Tejas@perioimpl : 26th February 2010 at 15:40. Reason: see edit
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Old 26th February 2010, 17:19   #11
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Quote:
Originally Posted by SPIKE ARRESTOR View Post
also if you have an option to measure the frequency gently tap the belt at the midposition and allow it to vibrate, the frequency of vibration can then be measured in Hertz.

Spike
.. is this humanly possible?
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Old 26th February 2010, 18:15   #12
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Originally Posted by siddartha View Post
.. is this humanly possible?
Humanly its called ESSSperience.

For laymen, you will need a tuning fork, for the preset frequency and when the Tuning Fork Resonates with the Vibration/Frequency of the fan belt .
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Old 27th February 2010, 13:16   #13
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Quote:
Originally Posted by Tejas@perioimpl View Post
Spike, so will mahindra compensate me for a faulty job?

EDIT: Spike just kiddin... I know it's not your domain!

@Tejas you are correct, its not my domain, but as a customer i would be on your side, i hope this answers your question

Spike
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Old 27th February 2010, 17:45   #14
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Post deleted by the Team-BHP Support : One-liners that add ZERO value to the thread are strictly prohibited on Team-BHP. In fact, they are considered as SPAM. Please do not hit the post submit button unless you have something of value to add to the thread.

We advise you to visit our board rules before proceeding any further.

Last edited by GTO : 28th February 2010 at 16:34.
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Old 27th February 2010, 18:20   #15
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Quote:
Originally Posted by ex670c View Post
Humanly its called ESSSperience.

For laymen, you will need a tuning fork, for the preset frequency and when the Tuning Fork Resonates with the Vibration/Frequency of the fan belt .
Specially trained dogs are now used for smaller car's fan belts. These vehicles emit frequencies higher than human ears can hear but the canny kanines have no trouble.
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