IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

B4 servo

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

paolo
Posts: 4
Joined: Mon Feb 18, 2013 1:04 pm
Year and Model: V70 2002
Location: Kent, UK
Has thanked: 0
Been thanked: 0
paolo

B4 servo

Post by paolo » Tue Feb 19, 2013 4:36 am

Hi Guys.
I have had shift flare between 2nd and 3rd gear on my 2002 V70.
I have done 2 sump dumps so far, (planning on another 2), which has smoothed it out a little, but decided to change the B4 servo cover too.
All went well, the new cover seems to just be a different design, no detached washer on my old one, however, when I dismantled the servo pushrod to give it a good clean, I did notice one of the washers in the assembly was slightly concave/dished. Is that normal? or is that one of the problems, if so where would I source either a replacement servo pushrod or the washer.
So far, changing the cover has made no difference to the shift flare.

precopster
Posts: 7476
Joined: Sat Aug 21, 2010 12:20 am
Year and Model: Lots
Location: Melbourne Australia
Has thanked: 4 times
Been thanked: 108 times
Australia
precopster

Re: B4 servo

Post by precopster » Tue Feb 19, 2013 5:05 am

Changing fluid and B4 cover should be accompanied by a fluid counter reset and drive adaptives which are done through Vida/Dice.
Current cars:2002 XC70, 2006 Ssangyong Rodius (Stavic), 2006 XC90 2.5T, VW Transporter 2.5TDI

www.precisioncarmodules.com.

paolo
Posts: 4
Joined: Mon Feb 18, 2013 1:04 pm
Year and Model: V70 2002
Location: Kent, UK
Has thanked: 0
Been thanked: 0
paolo

Re: B4 servo

Post by paolo » Tue Feb 19, 2013 5:26 am

Volvo dealer only?

precopster
Posts: 7476
Joined: Sat Aug 21, 2010 12:20 am
Year and Model: Lots
Location: Melbourne Australia
Has thanked: 4 times
Been thanked: 108 times
Australia
precopster

Re: B4 servo

Post by precopster » Tue Feb 19, 2013 1:13 pm

You can purchase a Chinese copy of the Vida/Dice setup that dealers use and install to laptop. Afew sellers on eBay and some on Alibaba. Under $180 in most cases.

This is what many of us on MVS use.
Current cars:2002 XC70, 2006 Ssangyong Rodius (Stavic), 2006 XC90 2.5T, VW Transporter 2.5TDI

www.precisioncarmodules.com.

paolo
Posts: 4
Joined: Mon Feb 18, 2013 1:04 pm
Year and Model: V70 2002
Location: Kent, UK
Has thanked: 0
Been thanked: 0
paolo

Re: B4 servo

Post by paolo » Wed Feb 20, 2013 2:07 am

What about the dished/concave washer on the pushrod/solenoide assembly?

User avatar
vtl
Posts: 1805
Joined: Thu Aug 16, 2012 1:35 pm
Year and Model: 2005 XC70
Location: Boston
Has thanked: 3 times
Been thanked: 56 times
United States of America
vtl

Re: B4 servo

Post by vtl » Wed Feb 20, 2013 5:23 am

B4 didn't help at all for my 02 V70. What did help is Idemitsu Type-TLS (sump + return line) and TCM adaptation. Transmission shifts much smoother now, but still occasionally has flare shifts and kicks when ATF is becoming hot after coupe of hours in city traffic.
05 XC70 260k, 16 XC60 40k, 19 Tundra 1k

paolo
Posts: 4
Joined: Mon Feb 18, 2013 1:04 pm
Year and Model: V70 2002
Location: Kent, UK
Has thanked: 0
Been thanked: 0
paolo

Re: B4 servo

Post by paolo » Thu Mar 21, 2013 9:50 am

Update:
I removed the dished washer from the piston assembly and it's now sweet as a nut!

Katten
Posts: 31
Joined: Sat Aug 03, 2019 3:12 pm
Year and Model: S80 2002
Location: Sweden
Has thanked: 0
Been thanked: 1 time
Sweden
Katten

Re: B4 servo

Post by Katten » Sat Aug 03, 2019 3:14 pm

Did the problem stay fixed after you removed the washer? Also did you take any pictures? Im interested in this and to learn from it :).

User avatar
oragex
Posts: 4700
Joined: Fri May 24, 2013 6:20 am
Year and Model: S60 2003
Location: Canada
Has thanked: 94 times
Been thanked: 244 times
Contact:
Canada
oragex

Re: B4 servo

Post by oragex » Sat Aug 03, 2019 3:53 pm

Interesting fix. I would guess the bent washer was preventing the B4 piston to achieve its whole displacement. For the question above, when you remove the cover, a washer is attached to it. Normally it's attached quite solidly

Katten
Posts: 31
Joined: Sat Aug 03, 2019 3:12 pm
Year and Model: S80 2002
Location: Sweden
Has thanked: 0
Been thanked: 1 time
Sweden
Katten

Re: B4 servo

Post by Katten » Sun Aug 04, 2019 2:09 pm

I did think he meant a washer within the servo piston assembly and not the cover. I disassembled my piston a few days ago and two of the washer where concaved but I cant tell if they are supose to be that way or became like that after all the years of use :). Would be interesting to know!

Post Reply
  • Similar Topics
    Replies
    Views
    Last post