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Author Topic: "Bang" when changing down a gear.  (Read 2885 times)

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Road Hog Mad

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"Bang" when changing down a gear.
« on: 15 August 2010, 18:01:36 »
Omega AUTO 3.0 MV6 X Reg.

Seems when driving around town and the car going from 3rd to 2nd goes with a bit of a bang, either that or it is coming from the rear.

I was going to say accelerating 0-50 is nice and smooth, which it normally is but today it decided to stick in 1st gear longer than normal and then bang up to 2nd gear.

It does all of the above at least twice on a 10 mile around town trip, so its not major but maybe something is developing.

All the gears work if you select them manually and as said is normally smooth.

Never had the chance to check the auto box oil as I would suspect this first but I am sure these are sealed for life and there is no dip stick apart from me.  :P

I have a donor car, a 2.5 V6 Estate Auto T Reg. 146,000 Miles. Presuming anything can be taken off that?

EDIT...and to add, it only does it warm weather lol.
« Last Edit: 15 August 2010, 18:03:27 by pjwright »
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Lizzie_Zoom

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Re: "Bang" when changing down a gear.
« Reply #1 on: 15 August 2010, 18:06:14 »
Could be your diff, or the drive shaft.

I'd get underneath and inspect the bolts on the drive shaft, and maybe with the rear wheels off the ground, whilst getting someone to change through the gears, inspect / listen for anything obvious. ;) ;)

I once had a similar problem on a brand new Cortina; the prop shaft had not been bolted up at Ford's and was about to fall off!! :o :o
« Last Edit: 15 August 2010, 18:07:50 by Lizzie_Zoom »
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CaptainZok

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Re: "Bang" when changing down a gear.
« Reply #2 on: 15 August 2010, 18:08:48 »
Is it putting the autobox warning on the mid when it thumps?
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Road Hog Mad

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Re: "Bang" when changing down a gear.
« Reply #3 on: 15 August 2010, 18:12:57 »
No warnings, I'm having some new pads fitted soon to see if it stops that weird nose when braking so I'll inspect the rear of the car.

Always helps having a friendly mechanic who will let you go under the ramp and who only ever charges me trade price for some reason.
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CaptainZok

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Re: "Bang" when changing down a gear.
« Reply #4 on: 15 August 2010, 18:18:08 »
Think I'd be starting by checking the fluid level in the gearbox myself.

Engine running, take out the filler plug in the gearbox and fill with Dex3 till it just starts to run out.
Next step would be a change of fluid and filter.
Oh and the box in the 2.5 won't do as a replacement, you want an AR35 from a 3/3.2 not an AR25 which is what the 2.5 comes with.
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Varche

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Re: "Bang" when changing down a gear.
« Reply #5 on: 15 August 2010, 18:23:18 »
How many miles has it done since the last gearbox oil change? Needs doing about every 80 k less if driven hard or towing. It may, just may be the (dreaded) thrust washer disintegrated. If it is you will find the pieces in the G/b sump.

there is a good how to change the oil inc discount on the gaskets and filter on the forum maintenance guides.

Might just be as simple as needs gearbox oil level checking. My brother checked his peugeot today and ONE teasponful came out. Again there is a how to on the site. No dipstick I am afraid.

either way both are good preventative maintenance :y
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Road Hog Mad

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Re: "Bang" when changing down a gear.
« Reply #6 on: 15 August 2010, 18:24:08 »
I was thinking along the lines of a gear box oil change, maybe someone on here can give me a price? :D

The reason I suggested the donor car was I thought something that changes the gears up and down was wonky and the other gear box thing would swap over, or maybe I have had too much to drink.  :D
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Road Hog Mad

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Re: "Bang" when changing down a gear.
« Reply #7 on: 15 August 2010, 18:26:16 »
Quote
How many miles has it done since the last gearbox oil change? Needs doing about every 80 k less if driven hard or towing. It may, just may be the (dreaded) thrust washer disintegrated. If it is you will find the pieces in the G/b sump.

there is a good how to change the oil inc discount on the gaskets and filter on the forum maintenance guides.

Might just be as simple as needs gearbox oil level checking. My brother checked his peugeot today and ONE teasponful came out. Again there is a how to on the site. No dipstick I am afraid.

either way both are good preventative maintenance :y

To my knowledge it has never had a gear box oil change and the clock reads 141,000!  :o

I am open to offers for someone to service my box and cash to be paid, I live in the Manchester area.

I would do myself but don't really have access to a ramp for the time it would take to do it.
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CaptainZok

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Re: "Bang" when changing down a gear.
« Reply #8 on: 15 August 2010, 18:30:16 »
You can do it on ramps/axle stands mate it's just messy.
Parts are around £60-70 and filling is a lot easier with a pump up garden sprayer.
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Road Hog Mad

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Re: "Bang" when changing down a gear.
« Reply #9 on: 15 August 2010, 18:55:45 »
Would be ideal on a proper ramp, it needs doing before it gets any worse. I don't want to folk out for a new gear box.

No access to ramps so would be happy to pay someone to do it.
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Road Hog Mad

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Re: "Bang" when changing down a gear.
« Reply #10 on: 15 August 2010, 19:39:43 »
would the slight delay in gear change and then the bang say it could be the loose diff?
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Lizzie_Zoom

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Re: "Bang" when changing down a gear.
« Reply #11 on: 15 August 2010, 19:42:08 »
Quote
would the slight delay in gear change and then the bang say it could be the loose diff?


Yes, and the other points I made in my post in answer to your original question ::) ::) ::) ;) ;)


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Road Hog Mad

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Re: "Bang" when changing down a gear.
« Reply #12 on: 15 August 2010, 19:45:45 »
Quote
Quote
would the slight delay in gear change and then the bang say it could be the loose diff?


Yes, and the other points I made in my post in answer to your original question ::) ::) ::) ;) ;)



ta, chuck.

Will do.

Always the cheap option first lol.  ;)
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CaptainZok

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Re: "Bang" when changing down a gear.
« Reply #13 on: 15 August 2010, 19:53:39 »
Quote
would the slight delay in gear change and then the bang say it could be the loose diff?

Don't see how a loose diff can delay the gearchange mate, more likely an issue in the box itself.
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Road Hog Mad

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Re: "Bang" when changing down a gear.
« Reply #14 on: 15 August 2010, 20:27:53 »
Will check first and then sort an oil change
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