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Amazingly well documented Odometer Fix

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

This topic is in the MVS Volvo Repair Database » How to Fix the Odometer on your Volvo 850
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MadeInJapan
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Post by MadeInJapan »

When you try to pull the cluster it will be self explanatory...there will be a vacuum hose connected to the back side of it that effects the turbo gauge (needle)...it just slides off of a nipple there.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

bockreiter
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Location: Edwardsville, IL

Post by bockreiter »

I just did the odometer fix last weekend. I, too have a Turbo, so the needle for the turbo boost gauge had to come off. The needle has a female joint which slips snugly over the shaft of the mechanism behind the cluster. Mine slipped back a bit too easy and actually fell off when I turned the instrument panel over to re-attach all the screws. I gently squeezed the hollow portion of the needle shaft with pliers. This allowed for tighter fit. When re-installing, the needle should point at the middle of the boost gauge. I took about 60K miles before I found this site and instruction how to fix the odometer so, I skipped the "fast forward". I did write a note for the future noting the odometer repair, date and mileage. I did the A7 trick to poll my actual mileage and wish I would've done the odometer fix a few months ago, so I could have watched the 200,000 roll over.
'94 850 Turbo Wagon

approx. 200,000 miles.

MadeInJapan
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Post by MadeInJapan »

bockreiter wrote:...wish I would've done the odometer fix a few months ago, so I could have watched the 200,000 roll over.
You still can but it will take a drill and a pencil with an eraser on the end! :lol:
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

tailor
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Year and Model: 2004 XC90 2.5T AWD
Location: Toronto
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Post by tailor »

Linanas wrote:
Thanks for the prompt reply. Much appreciated.
Sorry, I'm extremely new to this.
I've tried looking at the vacuum diagrams from the 850 turbo manual, but it does't make sense to me. Do you have any photos? I can send you want I'm looking at if you'd like or you can download it from the main forum.

This is much harder than I thought. I just don't want to risk breaking anything and not having everything work back to default.
This is what the pipe looks like.The elbow should pull out with ease.
Image

This is the brass nipple at the back of the cluster,only to be found on turbo models.
Picture of brass nipple at the back of the cluster:
Image

The pipe always has to be removed, so yes I did remove it.I would remove either from the top at the brass nipple, or the at the bottom from the connection, under the kick panel,next to the steering column, this would depend on which was easier and my state of mind :mrgreen: . I had to remove the cluster twice and got frustrated because I was tired and was struggling, so I chose the other route.
On this issue of tiredness, if you can take a break do so, much better to do it slowly and surely than quick and muck it up.
I hope this helps.
1994 850 Auto Turbo wagon 306000km (Sold)
2004 XC90 AWD 188000km

"Life is like a reel to reel tape recorder,
the closer you get to the end,
the faster it spins."
Abe Gottschalk

Linanas
Posts: 23
Joined: 2 July 2007
Year and Model:
Location: San Francisco, Ca

Post by Linanas »

Thanks for taking the time to post the photos and explaining everything. :D
I followed instructions to fix the odometer.
Did a test run and it still doesn't work! I want to see the numbers roll. :cry:
I just took it apart again and the none of the teeth are broken. One thing to note (not sure if this affects anything) is that it doesn't have a wire, instead there is a 4 needle adapter.
SEE PHOTOS :arrow:
Image

Image

Not sure what's wrong???
This is what the pipe looks like.The elbow should pull out with ease.
Image

This is the brass nipple at the back of the cluster,only to be found on turbo models.
Picture of brass nipple at the back of the cluster:
Image

The pipe always has to be removed, so yes I did remove it.I would remove either from the top at the brass nipple, or the at the bottom from the connection, under the kick panel,next to the steering column, this would depend on which was easier and my state of mind :mrgreen: . I had to remove the cluster twice and got frustrated because I was tired and was struggling, so I chose the other route.
On this issue of tiredness, if you can take a break do so, much better to do it slowly and surely than quick and muck it up.
I hope this helps.
Turn Obstacles into Popscicles.

tailor
Posts: 570
Joined: 12 November 2006
Year and Model: 2004 XC90 2.5T AWD
Location: Toronto
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Post by tailor »

The smaller gear looks like it has a tooth missing!!!!
Or is that the old gear?
Did you try to wind on the miles using the pencil and eraser method? Did the numbers roll then? If not you may have the orientation of the gears all wrong or the motor may be shot.

There is a way to test the instrument panel. Look at the download-able 850 manual at the top of the page under instumentpanel.pdf
1994 850 Auto Turbo wagon 306000km (Sold)
2004 XC90 AWD 188000km

"Life is like a reel to reel tape recorder,
the closer you get to the end,
the faster it spins."
Abe Gottschalk

Linanas
Posts: 23
Joined: 2 July 2007
Year and Model:
Location: San Francisco, Ca

Post by Linanas »

The gear in yellow is the old broken tooth.
I didn't use the pencil and eraser method, instead I just manually turned/ rotated the wheel just enough to get the trip as well as the collective miles to move, so I could press the reset button. It rest, but once I installed it back in and test drove, it didn't work. :?

I don't have a diagnostic cable. My car as a data link connector, but for some reason I can't get the OBD II to read anything on it.
Mind boggling. I'm determined to get it to work.

:(
tailor wrote:The smaller gear looks like it has a tooth missing!!!!
Or is that the old gear?
Did you try to wind on the miles using the pencil and eraser method? Did the numbers roll then? If not you may have the orientation of the gears all wrong or the motor may be shot.

There is a way to test the instrument panel. Look at the download-able 850 manual at the top of the page under instumentpanel.pdf
Turn Obstacles into Popscicles.

Volgrrr
Posts: 246
Joined: 13 September 2006
Year and Model: '95 T5 wagon
Location: Near Ararat, Victoria, Australia

Post by Volgrrr »

Excellent, well thought out, clearly detailed set of instructions.

Well done!!!
There are only two types of car owners - those who own Volvos and those who wish they did.

Linanas
Posts: 23
Joined: 2 July 2007
Year and Model:
Location: San Francisco, Ca

Post by Linanas »

FINALLY GOT IT TO WORK! :P

THANK YOU TAILOR for all your help! :D

All I did this time was made sure I reinforce the prongs and made sure it was pushed in all the way.
The trip ometer is a little off, but I'm not going to bust my butt doing it a 3rd time.

CHEERS!
Turn Obstacles into Popscicles.

tailor
Posts: 570
Joined: 12 November 2006
Year and Model: 2004 XC90 2.5T AWD
Location: Toronto
Been thanked: 2 times

Post by tailor »

Glad to be able to offer some assistance!

More happy customers :lol:
1994 850 Auto Turbo wagon 306000km (Sold)
2004 XC90 AWD 188000km

"Life is like a reel to reel tape recorder,
the closer you get to the end,
the faster it spins."
Abe Gottschalk

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