1998 V70XC loud clunk from the rear end drivetrain

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Post Reply
User avatar
chaseinger
Posts: 18
Joined: Mon Sep 14, 2015 9:36 am
Year and Model: V70 XC 1998
Location: Indianapolis

1998 V70XC loud clunk from the rear end drivetrain

Post by chaseinger »

hello hive mind, i have a tad of an issue, hope you guys can help.

my xc is producing a loud noise, like a clunk, from the rear end when accelerating, especially around tight turns. looking at it it seems like there's no inspection plate or anythig for the rear split axle (thanks volvo, i guess they thought it'll never break), which i'm ssuming is the culprit.

i've exchanged the CV axles all around since they were pretty shot, which made the ride much smoother but didn't do away with the clunk. looks like i removed the symptoms but not the cause.

i know i can just drop the drive shaft and be done with it (i will, in fact, do this very thing this afternoon so i have a driveable car), however i did buy an AWD for a reason. i also exchanged the rear CVs for a reason. ;)

so, there's 3 questions:

- try as i might i can't find a service manual for this car. i did find explosion diagrams which are very helpful, but any pointers, especially towards the rear end would be greatly appreciated.

- what is clunking? my guess is it's in the gearing inside the split axle, but that is what it is, just a semi-educated guess.

- is there a trick on how to remove the split axle without taking apart what seems like the entire rear end?

looking forward to your input! i'll follow up with pictures after today's operation so you chaps know what i'm talking about.

cheers!
previous:
740 GL sedan in that hideous light green metallic
740 GLT station wagon (sold, but still alive with 600k+ miles)
760 GLE sedan grey metallic

current:
1998 V70XC (AWD, well, not anymore)

jcdillin
Posts: 177
Joined: Thu Oct 30, 2014 1:32 pm
Year and Model: 06 V70R
Location: Jacksonville Florida

Post by jcdillin »

Getting a copy of vida is really the best source of diagrams and repair procedures for this car, you can pick up a copy on ebay, I believe there also some download links in the vida forum section of this site.

Clunking could be the torque tube mount pictured here or it also could be your carrier bearing tearing loose.

Image

Mine was doing the thump/clunk and it was the carrier bearing rubber mount torn loose. Worth checking the torque tube mount before pulling the propshaft.

jcdillin
Posts: 177
Joined: Thu Oct 30, 2014 1:32 pm
Year and Model: 06 V70R
Location: Jacksonville Florida

Post by jcdillin »

Here are some diagrams, looking up the removal procedure as well.
Prop.png
Prop.png (47.61 KiB) Viewed 1877 times
Diff.png
Diff.png (114.27 KiB) Viewed 1877 times
Diff2.png
Diff2.png (121.16 KiB) Viewed 1877 times

User avatar
chaseinger
Posts: 18
Joined: Mon Sep 14, 2015 9:36 am
Year and Model: V70 XC 1998
Location: Indianapolis

Post by chaseinger »

thank you kind sir, those are indeed the explosions i found as well. just downloaded a copy of VIDA, now all i need is a windows machine. :)

also a great pointer towards the torque tube mount. i'll have a close look at that.

keep 'em coming gents, hugely appreciated!
previous:
740 GL sedan in that hideous light green metallic
740 GLT station wagon (sold, but still alive with 600k+ miles)
760 GLE sedan grey metallic

current:
1998 V70XC (AWD, well, not anymore)

Big Will
Posts: 30
Joined: Mon Oct 19, 2015 1:40 pm
Year and Model: 1998 V70 AWD
Location: Berlin, Germany
Been thanked: 1 time

Post by Big Will »

Sounds to me like the freewheel of the viscous coupling if it's happening on corners at speed. Obviously check the mount on the torque tube and the driveshaft as suggested but it may be a sign that you need a new viscous coupling. Does this also happen as you are coming to a stop just before actually stopping?
98 V70 AWD - M58 Gearbox - Beüst custome tune, 20T turbo w/angled exhaust housing, Green injectors, Öhlins Roadholding Suspension, B MAC Built Engine

User avatar
chaseinger
Posts: 18
Joined: Mon Sep 14, 2015 9:36 am
Year and Model: V70 XC 1998
Location: Indianapolis

Post by chaseinger »

jcdillin wrote:Clunking could be the torque tube mount pictured here or it also could be your carrier bearing tearing loose.
Mine was doing the thump/clunk and it was the carrier bearing rubber mount torn loose. Worth checking the torque tube mount before pulling the propshaft.
you, sir, are a star. i inspected the drive shaft and torque tube today, and sure enough: the bushing of the tube mount hangs in pieces. my guess is it moves when torque is applied, thus misaligning inside the split axle and producing the clunk.

30 bucks replacemement on fcp euro parts ordered today, getting it on tuesday, the thanksgiving drive is saved! thanks a ton, i'll update after the exchange.
previous:
740 GL sedan in that hideous light green metallic
740 GLT station wagon (sold, but still alive with 600k+ miles)
760 GLE sedan grey metallic

current:
1998 V70XC (AWD, well, not anymore)

User avatar
chaseinger
Posts: 18
Joined: Mon Sep 14, 2015 9:36 am
Year and Model: V70 XC 1998
Location: Indianapolis

Post by chaseinger »

Big Will wrote:Sounds to me like the freewheel of the viscous coupling if it's happening on corners at speed. Obviously check the mount on the torque tube and the driveshaft as suggested but it may be a sign that you need a new viscous coupling. Does this also happen as you are coming to a stop just before actually stopping?
that is a fear i had, and i have high hopes it actually is the tube mount. it's shot. happens not at speed, but mostly when accelerating from a stop into a turn. yes, also when shifting, but a lot less, and only lately. i do hope the worn mount didn't cause more damage.
previous:
740 GL sedan in that hideous light green metallic
740 GLT station wagon (sold, but still alive with 600k+ miles)
760 GLE sedan grey metallic

current:
1998 V70XC (AWD, well, not anymore)

User avatar
chaseinger
Posts: 18
Joined: Mon Sep 14, 2015 9:36 am
Year and Model: V70 XC 1998
Location: Indianapolis

Post by chaseinger »

sorry folks, i never updated this. i ended up removing the drive shaft. it's a FWD now. :)

whatever i'd tried, the clunking never went away, so short of opening the rear gearbox i decided to cut off the hind wheels from the drive train. dropping that main shaft was so much easier than anything i had tried to do before, and it feels as if i'm getting better mileage too.
previous:
740 GL sedan in that hideous light green metallic
740 GLT station wagon (sold, but still alive with 600k+ miles)
760 GLE sedan grey metallic

current:
1998 V70XC (AWD, well, not anymore)

Post Reply
  • Similar Topics
    Replies
    Views
    Last post