Noise Diagnosis - * Please *

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Noise Diagnosis - * Please *

Postby grim_b » 16 Jan 2006, 14:19

Problem Description

Noise from engine bay, not heard during load / reving.

Sound Decsription

Turning sqeeky noise, not unlike the sound (i guess) of a bearing grinding crossed with a Semi-mute squeal beginning. As in, like a full on squeal lasting a few seconds, but this one is probably 2 a second lasting a moment before a pause then another squeal(k)? (It makes sense in my head)

:cry:

I have noticed that at speed there is a noticeable clicking like a stone in the tyre. Whilst this is probably it, I thought I would mention it. :oops:

My opinions

I think it is either the alternator going (as I have had light dimming on idle for a while) or it could just be the belt is slipping.

Your Points below
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Postby mint » 16 Jan 2006, 15:32

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Postby Neilyman » 16 Jan 2006, 15:35

Alternator, Belt slippage, Waterpump, Viscous fan coupling.

I changed my fan coupling `cos it squeeked/grinded, & it drove me mad when sat in traffic!
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Postby Neilyman » 16 Jan 2006, 15:37

Erm, Yes Mint, it`s a set of points.........You saying that they could be squeeking????

Or have you hit the wrong thread ;)
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Postby grim_b » 16 Jan 2006, 15:52

Neilyman wrote:Erm, Yes Mint, it`s a set of points.........You saying that they could be squeeking????

Or have you hit the wrong thread ;)


The question is "What are you pointing to Mint?" :lol:

**Oh I see, very funny Mint**
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Postby Neilyman » 16 Jan 2006, 17:03

grim_b wrote:
Neilyman wrote:Erm, Yes Mint, it`s a set of points.........You saying that they could be squeeking????

Or have you hit the wrong thread ;)


The question is "What are you pointing to Mint?" :lol:

**Oh I see, very funny Mint**


Doh!, I see it now ;) :)
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Postby Harry Flatters » 16 Jan 2006, 18:00

Grim, is it 'squeak.....squeak....squeak.....squeak....' and so on?

Is it at about engine speed or related to engine speed?
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Postby Doive » 16 Jan 2006, 18:26

To see if it is the alternator, or at least related to the fan belt, try removing the belt and running the engine for a few seconds - not for too long though as the water pump will not be circulating. If the squeak disappears then you can narrow the suspects down to water pump, alternator and fan coupling.
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Postby grim_b » 17 Jan 2006, 09:59

Well, I ran the car for approx 10 miles last night and it seems that after warming up it stopped when on idle? it is a squeak, squeak engine rev matching frequency.

I did notice to my dispear that the fan belt squealed for the first time since last year when the engine bay was damp enough?

The Plan

Friday:
Buy new oil (erm, what type please:?::oops:), Fan belt (Sizes:?:) Alternator quote and buy new colortune.

Drain oil, remove fan belt. Leave to drip all night.

Saturday:
New oil in (Erm, how much:?:), Fan belt fitted, colortune mixture.

Grim_b Reasoning

The fan belt is slipping when wet - replace it.
The oil has not been changed for over a year now - replace it.
The mixture has not been right (I am sure) since the fitting of the K&N replacement filter. If you have one of these fitted to your standard 1256, can you remember it affecting the mixture in the following way? Good top end, but fluffy idle and low rev driving?

Thanks :wink:
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Postby shuvit-tim » 17 Jan 2006, 10:07

dont forget a new oil filter when you change the oil. alternators arent cheap, particularly if you dont want ot give away your existing unit to get rid of a surcharge. IF the alternator is squeaking it isnt necessarily knackered? spray a little bit of WD40 behind the alternator/fan belt wheels see if it stops. not too much else you'll end up with a lubricated fan belt :?
when all else fails, rivets, cable ties and bodge tape will see you through

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Postby Neilyman » 17 Jan 2006, 10:21

Tip I picked up whilst working at a local Merc dealers........

For squeaky fan/whatever belts, hold a peice of tyre crayon, the yellow stuff for marking punctures, against the inside of the belt while it`s running.....watch ya fingers! :shock:
The wax heats up & gets sticky, the belt grips the pullies & don`t squeak anymore, also works with a candle, I`ve done it.

Don`t over tighten the belt, it just shags the waterpump & alternator bearings!!
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Postby Doive » 17 Jan 2006, 14:18

Oil, I use a good quality 20W50, any lighter and it would escape through every seal on my engine! Empty to full, including a filter change, is about 3.5 litres give or take.

Run a good degreaser over the belt pulleys, something like spray gunk did the trick for me. Loosening the belt completely and then retightening it also made the world of difference, I found when the car is cold and with dipped beam on plus other electrics the belt squeals like a stuck pig, even with correct tension. Disappears as starting discharge drops away.
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Postby grim_b » 17 Jan 2006, 16:26

Going to the part shop after work today!
Any ideas of the fan belt size? I will need to know this before I go.... pushing it. 8)
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Postby Doive » 17 Jan 2006, 19:12

It should be listed in manuals at any half decent parts shop. If in doubt, go to Halfords who do the correct part off the shelf.
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Postby Harry Flatters » 17 Jan 2006, 21:16

For squeaky fan/whatever belts, hold a piece of tyre crayon, the yellow stuff for marking punctures, against the inside of the belt while it`s running


Ye gods, Neil, you sure?! Sounds like it's guaranteed to end in tears........

:shock: Ouch!
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Postby Neilyman » 17 Jan 2006, 22:56

Harry Flatters wrote:
For squeaky fan/whatever belts, hold a piece of tyre crayon, the yellow stuff for marking punctures, against the inside of the belt while it`s running


Ye gods, Neil, you sure?! Sounds like it's guaranteed to end in tears........

:shock: Ouch!



Neilyman wrote:.....watch ya fingers! :shock:


:P :P
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Postby Herbie_Flowers » 17 Jan 2006, 23:37

Neilyman wrote:Tip I picked up whilst working at a local Merc dealers........

For squeaky fan/whatever belts, hold a peice of tyre crayon, the yellow stuff for marking punctures, against the inside of the belt while it`s running.....watch ya fingers! :shock:
The wax heats up & gets sticky, the belt grips the pullies & don`t squeak anymore, also works with a candle, I`ve done it.

bet you still charged the poor customer for parts and labour though :shock:
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Postby Neilyman » 18 Jan 2006, 08:22

Herbie_Flowers wrote:bet you still charged the poor customer for parts and labour though :shock:


I did no such thing! :shock:
I was there purely as a visiting contractor. I was a mobile sparky. 8)
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Postby shuvit-tim » 18 Jan 2006, 10:31

oh now dont get me started on sparkys...
when all else fails, rivets, cable ties and bodge tape will see you through

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Postby Neilyman » 18 Jan 2006, 10:48

shuvit-tim wrote:oh now dont get me started on sparkys...


OK then we won`t!
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Postby shuvit-tim » 18 Jan 2006, 10:57

well that's ok then :P
when all else fails, rivets, cable ties and bodge tape will see you through

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Postby grim_b » 18 Jan 2006, 11:01

Got a new fan belt. The guy in the shop tried selling me the wrong size because they only had one on the Chevette records. (6217) But I baught one of those last year and it didn't fit. I asked for a bigger one (6218) and that was the exact one that was on the car.

Changed the belt over last night 20mins before I was due out and jobs a gooden. :wink:

Could only find one 20w50 in halfords and that is their Classic Car Oil, should be better than the thin stuff I am using anyways.

They only had motorbike colortunes in halfords, so I will ask at the parts place tonight when I buy my oil filter.

Anyone know if I should try to replace the sump gasket when I drain the oil, or am I asking for trouble there? :?:

Cheers all,
G.
:D
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Postby Doive » 18 Jan 2006, 12:18

grim_b wrote:Anyone know if I should try to replace the sump gasket when I drain the oil, or am I asking for trouble there?

Unless it's leaking like a sieve I'd generally leave it, sealing a sump gasket again can be a bit tricky. If it is leaking in one particular area, slap a thin bead of silicone sealnt around it as a bodge fix.
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Postby shuvit-tim » 18 Jan 2006, 15:18

if it aint broke dont fix it
when all else fails, rivets, cable ties and bodge tape will see you through

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Postby Harry Flatters » 18 Jan 2006, 19:10

.....watch ya fingers!


Yep, saw that, still sounds scary.

Could rub the belt with wax then run it.
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