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2001 V70XC - 200,000 Miles Makeover Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R

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xHeart
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Re: 2001 V70XC - 200,000 Miles Makeover

Post by xHeart »

The undercarriage tapping is loudest where the bracket holds the catalytic converter.

I looked closely the way bracket is holding the catalytic converter. It consists of items 8-12 in the diagram below:
Image

If bracket is undone the cat will be suspended from turbo at item 2 and exhaust with item 22. It is likely, without bracket support, I would imagine, this would cause the flex pipe to fail? This bracket assembly:
Image

Unless you say other, using bottle-jack may be best to support the cat while the bracket is removed to look for what causes tapping? Anyone with tapping experience -- is it a warning audio for failing O2 sensor located right above?
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- Pete -
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Post by - Pete - »

Your 01 may be different, but taking that bracket down to inspect won't hurt a thing. There are a few (3, I think) plastic retainers that secure rigid brake/PS lines and one that retains the wire for your rear O2 sensor. Just squeeze those with a needle-nose to allow the metal plate to drop down. Remove the 4 12mm bolts & the plate should just drop down. There are separate "hangers" (#4) helping to hold up your downpipe/catalytic converter above this plate, so no worries about the flex joint.

I can't see the part number on your image, but it doesn't look like the turbo 2.4/2.5T downpipes I'm used to seeing. It looks more like the NA DP like Biggertuna posted about recently, but I could be wrong. Either way, removing the plate won't hurt a thing. Also, don't order a new plate. There's likely nothing wrong with the old one, but something in that vicinity is making the clatter.

Edit, I found this, shows fitment for turbo'd models. I've never seen this part before though. If yours has it maybe it's broken & making the noise as your exhaust vibrates.

https://parts.volvocars.ca/p/Volvo__S60 ... 80834.html
2001 V70XC 167k
2004 V70 AWD 147k
2004 V70R M66 146k
2004 XC70 299k
2006 XC70 155k Sold

xHeart
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Post by xHeart »

- Pete - wrote: Fri Apr 17, 2020 1:12 pm Your 01 may be different, but taking that bracket down to inspect won't hurt a thing. There are a few (3, I think) plastic retainers that secure rigid brake/PS lines and one that retains the wire for your rear O2 sensor. Just squeeze those with a needle-nose to allow the metal plate to drop down. Remove the 4 12mm bolts & the plate should just drop down. There are separate "hangers" (#4) helping to hold up your downpipe/catalytic converter above this plate, so no worries about the flex joint.
I am suspecting the rigid brake line knocking on bracket. One plastic retainer was out.
Here is progress pix:
MVS_CatHanger_0945.jpg
MVS_CatHanger_0945.jpg (160.05 KiB) Viewed 581 times
MVS_CatBracket_0947.jpg
MVS_CatBracket_0947.jpg (122.89 KiB) Viewed 581 times
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abscate
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Post by abscate »

Nice pictures xheart, worth 2x10E3 words.
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xHeart
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Post by xHeart »

abscate wrote: Sat Apr 18, 2020 3:44 am Nice pictures xheart, worth 2x10E3 words.
I appreciate that you appreciate skipper.

IF, it is the hard brake line coming loose from the retainer, THEN, it is likely from the caliper and brake line flaring I did around November 2019. This routed brake line goes to the passenger side caliper.

FWIW, this thread viewtopic.php?f=9&t=91484
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Post by xHeart »

Cleaned off rust on the hanger and gave it a hight temp rust prevention coating. The two retainers are good, no crack or tounge damage. Inserting 2 rubber rollers as spacers around the hard brake line.
MVS_CatHanger_0946.jpg
MVS_CatHanger_0946.jpg (162.4 KiB) Viewed 560 times
MVS_CatHanger_0951.jpg
MVS_CatHanger_0951.jpg (131.27 KiB) Viewed 560 times
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Post by abscate »

That must get nasty working on those driveshafts sitting near that hot exhaust,getting road salted all the time

“ invokes the FWD prayer of thanks”
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Post by xHeart »

abscate wrote: Sun Apr 19, 2020 5:12 am That must get nasty working on those driveshafts sitting near that hot exhaust,getting road salted all the time

“ invokes the FWD prayer of thanks”
Indeed, I see the simplicity of our FWD 1997 850.

Keeping AWD would be a commitment of time and money. Not a joyful feeling to see another multi-step repair coming.
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xHeart
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Post by xHeart »

The cat support bracket is restored and back on. Car starts like a charm, and took it for a lone drive. The occasional tapping sound is still present. It appears randomly with no particular interval, moment, or tied to a rpm.

Going back to diagnostic desk.
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Post by - Pete - »

Does it coincide with small surface imperfections in the road?

I’ve been thinking about this for a while now. I’m wondering if your original sway bar bushings are worn to the point that you’re hearing the bar making percussion noise?

The front sway bar is right there in that vicinity & is an a annoying & slight sound. The bar on my 04 XC70 285k miles rattles a bit. My 04V70 AWD is beginning to emit a similar sound.
2001 V70XC 167k
2004 V70 AWD 147k
2004 V70R M66 146k
2004 XC70 299k
2006 XC70 155k Sold

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