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2010 Volvo V70 AWD

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Old Sep 19th, 2020, 17:57   #1
kirkwallcity
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Default 2010 Volvo V70 AWD

Hi guys,

I purchased my V70 a year ago and earlier this year asked my local independent mechanic to service it and change the brake fluid, transmission oil and service the Haldex system.

A couple of days after this, the AWD Disabled error message came up, so I took it back to him. He confirmed that the AWD pump was knackered, so he ordered a new one. Fast forward to two weeks ago (due to lockdown) and he fitted the new pump. However, since then there has been a vibration from the rear at low speed acceleration. I took it back again and he thinks it is coming from the propshaft and says he will realign it.

A couple of things concern me. Firstly, he said he had to break the pump out when it was changed, despite confirming that they had it out when they serviced the Haldex. Secondly, I am concerned that running it meantime, if there is something wrong with the propshaft, will do further damaged.

Car is a 80,000 miler with full history and has been well maintained by the previous (undertaker) owner.

Thoughts?

Bob
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Old Sep 19th, 2020, 22:39   #2
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Could have disconnected the propshaft and not marked it. Its been put back in the wrong orientation.
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Old Sep 19th, 2020, 22:42   #3
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Sounds to me like you need someone who knows what they're doing. Prop shaft now out of balance as it wasn't marked. Basic stuff.
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Old Oct 7th, 2020, 20:14   #4
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As far as i am aware When a prop shaft is balanced it doesn't know where it sits on the car! It is balanced on a machine. It shouldn't matter where it is bolted back up on the car!
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Old Oct 8th, 2020, 21:17   #5
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As far as i am aware When a prop shaft is balanced it doesn't know where it sits on the car! It is balanced on a machine. It shouldn't matter where it is bolted back up on the car!
Not sure I agree - traditional engineering teaching suggests you should always mark the flanges on both the shaft and the flanges on the gearbox/axle to ensure correct re-assembly. Traditionally this was done with a centre punch on both flanges or a hacksaw cutting a small groove into both.
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Old Oct 8th, 2020, 21:42   #6
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I had problems with mybAWD system when the vehicle was almost 3 years old.

First time pump cleaned out and oil changed, 2nd visit 2weeks later new pump fitted. Approx 2 weeks later another pump fitted and a software update. No problems since then.

Perhapds you need the software update?
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Old Oct 8th, 2020, 21:50   #7
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Quote:
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Not sure I agree - traditional engineering teaching suggests you should always mark the flanges on both the shaft and the flanges on the gearbox/axle to ensure correct re-assembly. Traditionally this was done with a centre punch on both flanges or a hacksaw cutting a small groove into both.
That's only if they were balanced on the car , I don't know of any cars that had propshafts balanced on the car ... They are balanced as a unit off the car so it dosn't matter how you bolt them on ..
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Old Nov 4th, 2020, 12:50   #8
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Its been said but the propshaft is balanced as a discreet assembly, despite what some manuals might say (including Haynes) there is no requirement to mark the flanges when removing or put back the same way. If you were splitting the propshaft to change the centre bearing - that would be different.

I'd check the flanges are mated correctly and all bolts are correctly tight, including the centre bearing carrier.
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Old Nov 4th, 2020, 14:10   #9
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Its been said but the propshaft is balanced as a discreet assembly, despite what some manuals might say (including Haynes) there is no requirement to mark the flanges when removing or put back the same way. If you were splitting the propshaft to change the centre bearing - that would be different.

I'd check the flanges are mated correctly and all bolts are correctly tight, including the centre bearing carrier.
Quite right ! I think this old wives tale ( of which there are many on here ) comes from the 1950s when perhaps propshafts were balanced on the car if there were vibrations on final road test !
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