Author Topic: Screeching sound sometimes comes from engine or transmission  (Read 202 times)

Dawud Beale

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I sometimes hear a sort of screeching sound coming from the engine or transmission of the vehicle when the engine is running. I hear it sometimes when the engine is idling in neutral, and other times when I put it in gear pulling away. I never hear it once I start a long drive on motorways etc, only when i first start the car.

Any idea what this might be?

VicW

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Re: Screeching sound sometimes comes from engine or transmission
« Reply #1 on: May 13, 2020, 06:37:04 PM »
Possibly the belt that drives the alternator, water pump and aircon compressor. The fault  is, I believe, uncommon on the Jazz.

Vic.

Jocko

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Re: Screeching sound sometimes comes from engine or transmission
« Reply #2 on: May 13, 2020, 06:37:35 PM »
+1

springswood

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Re: Screeching sound sometimes comes from engine or transmission
« Reply #3 on: May 15, 2020, 10:34:27 AM »
I'd agree. It could either be that the belt is loose or worn . Tension is adjusted with the alternator. If that's been touched just before this started then that could be it . Otherwise look for wear on the belt or pulleys . Access isn't great .Haynes suggest jacking up and removing the front left wheel (and liner, presumably ).
"Indecision is a terrible thing"
Or is it? What do you think?

culzean

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Re: Screeching sound sometimes comes from engine or transmission
« Reply #4 on: May 15, 2020, 11:28:24 AM »
Sometimes it is just the idler pulley bearing that screeches -  not the belt,  a loose belt is more likely to screech when alternator loaded up ( try turning all electrics on and 'blipping' the throttle to provoke screech ).

Have replaced aux belts on Jazz MK1 ( where you need to slacken off alternator pivot bolt and another bolt that allows alternator to be pivoted to tension the belt - neither are easy to get to -  you need some decent tools )  and Civic which has spring loaded tension - as does the MK2 onwards )

If  you are going to replace belt make sure you have a diagram of where it runs,  when I changed the one on Civic ( when I replaced aircon clutch I thought - mainly because getting to the belt was a big PITA - i may as well replace belt as well, I got the belt from Cox motors ( was not gonna fit a cheapo belt after all the trouble to access it - and the belt came with a diagram of how the belt is threaded over pulleys - showing the right and wrong ways,  I would have been stumped without it - and it is easy to get in a muddle - you cannot really photograph it ) the belts have no fixed replacement mileage or time,  belts are only replaced when cracked or fraying  and can easily do 150,000 miles ( polyurethane with kevlar cords ).

Take wheel and liner out of the way as a lot of belt is hiding behind a steel chassis member, you need to get to bottom run of belt anyway as that is where you measure the tension.

I have attached PDF of Haynes manual pages for aux drive belt - The figures for deflection given by Haynes are
new belt - 4.5 to 6mm  ( the belt will stretch slightly as it beds in )
used belt - 7.5 to 10mm
« Last Edit: May 15, 2020, 11:55:52 AM by culzean »
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