Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You

Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI 101

TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

Thread Tools
Old February 17th, 2011, 19:01   #1
Join Date: Jul 2008
Location: Los Angeles
TDI(s): 2003 Jetta
Default Motor Mount replacement. 2003 Jetta TDI Wagon

I took my car in to my local shop to have them look at a shock, which they fixed, and they mentioned they thought there also was a motor mount problem.

1) How many motor mounts are there on a 2003 TDI wagon and where are they located?
2) What is a dogbone and is that related?
3) Are there any other mounts to replace, like transmission mounts.
3a) Are there any other parts you should replace instead of re-use.
4) There seems to be some kind of shock absorber mounted to the left side of the engine (left of the timing belt I believe) that has a bushing on its lower end. This busing seems very loose. What part is this? (dogbone?)
5) Last what parts SHOULD I definitely replace or seriously inspect when dealing with motor mounts?

2003 Jetta Wagon TDI. 110,000k. Biodiesel all the way. Bilstein springs and struts. Panzer Plater. Alligator Chiped. Bosio Injectors.


PS. I did search for "motor mount" and just saw wingnuts broken engine block. Is there a write-up about this repair anywhere?
Doug183 is offline   Reply With Quote
Old February 18th, 2011, 09:19   #2
Veteran Member
Corsair's Avatar
Join Date: Aug 2003
Location: Auburn, New York
Fuel Economy: 52/48/??

Not sure if you have the auto trans or 5-spd manual.
I'm going to answer as if manual. Not sure if the answers are different for auto.

There are basically 3 isolated mounts of interest.
The trans bolts to the engine in any case, so think of that engine+trans assembly as one piece.

There are two rather beefy mounts that hold the engine+trans assembly in the engine bay. The function of these two is mainly to hold the weight of the engine+trans as they (it) hangs in the engine bay. These two are called the:

Engine mount (on the timing belt side, I think is what you refer to in 4 above)
Transmission mount (behind the battery and under the air box, looks similar but not identical to the engine mount)

Next, because this is a front wheel drive car with the engine & trans mounted transverse, then when the engine tries to accelerate or decelerate the car, the torque reaction will attempt to cause the engine+trans to do somersaults in the engine bay. To keep that from happening there is a third mount, officially called the pendulum mount (Because it addresses the pendulum motion of the engine+trans, think of that as a portion of a somersault). This mount resembles a dogbone, hence its nickname. This mount is found underneath the car, just off center toward the drivers side. It connects from the transmission and rearward to the subframe.

The original large bolts that attach these mounts are one-time-use bolts and must be replaced if they are removed. You can read horror stories on this forum where people have replaced mounts but not the bolts, then had the bolts fail. This can lead to one side or the other of the engine+trans literally falling down onto the pavement below.

idparts.com sells the mounts and the bolts.

Sorry I can't tell from your description if you have a specific mount problem or if the shop is just trying to upsell. For things related to the timing belt and engine mounts especially, I recommend to look on this forum and find a service guru in your area, establish a relationship with them. At 110K miles, your timing belt should have been replaced very recently. Hope it was done by a guru as that's critical!

If your 2003 TDI wagon happens to be a 5-speed, it's a very desirable vehicle among "the cult". Enjoy!
Best Regards.... Corsair....
2002 Jetta GLS TDI 5-spd 325Kmi, 2014 JSW TDI 6M
2006 Audi A4 Quattro Avant 2.0T 6M
2004 Jetta GL wagon 2.0L (gas) 5-spd (sold)
[also had 03 TDI GLS 5spd wagon bought new, sorely missed]

Last edited by Corsair; February 18th, 2011 at 09:23.
Corsair is offline   Reply With Quote
Old February 18th, 2011, 10:15   #3
Veteran Member
Join Date: May 2003
Location: Between Toronto & Montreal
Fuel Economy: 5.3 l/100 km (at 115 km/h)

Recommended TDI-specialist in the L.A. area: Leonard Harview of Wild Rose Motors in Whittier... (Make that Strongly Recommended TDI-specialist...) http://www.vwtdionly.com/

UserID "RobbieTDI" in Redondo Beach also does work and knows these cars... http://forums.tdiclub.com/member.php?u=70811

BTW, with regard to your "some kind of shock absorber mounted to the left side of the engine" - that's the serpentine (alternator) belt tensioner... If it's bouncing around a lot with the engine idling, it may need to be replaced, or else your alternator pulley (clutch-type) is failing...


Pereat mundus, fiat musica!
ymz is offline   Reply With Quote
Old February 18th, 2011, 12:42   #4
Join Date: Jul 2008
Location: Los Angeles
TDI(s): 2003 Jetta

Sorry I left out: Its an automatic.

Yuri: Leonard is the guy who put the Alligator Chip and Bosio injectors in as well as rebuilt the Injector Pump which was leaking and a new timing belt. He is great, just very busy and a bit far.

As for the the thingy on the left, thanks for letting me know its the tensioner. The lower part rattle slightly like the busing is worn on it down there. (hard to see.)

If I want to replace all three motor mounts, how hard of a job is that to do? Any tutorials on it?

Last, so I don't have to replace the 'dogbone?'

Doug183 is offline   Reply With Quote
Old October 2nd, 2011, 21:20   #5
Veteran Member
Join Date: Jul 2011
Location: Monterrey, Mexico

I would also want to know more about this. is the wagon the same as the sedan, motor mounts wise?
joseluis.17g is offline   Reply With Quote
Old October 2nd, 2011, 21:40   #6
Veteran Member
dieselfueler's Avatar
Join Date: Nov 2003
Location: Greater Jenkinsville, SC Metroplex Area

They are the same mounts

'04 PDWagon, RC3, VNT17,PD150 inj's,FO6S2 cam = 3rd gear wheel spin
356,000 miles

Respect, protect, and maintain complex systems - whether natural or of German design, to benefit from their full potential.
dieselfueler is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Motor mount spacers in a 2003 TDI? CubbyChowder VW MKIV-A4 TDIs (VE and PD) 0 September 26th, 2010 14:20
Motor Mount Replacement? bugsy TDI 101 4 March 22nd, 2010 09:19
2003 Jetta TDI wagon carpet replacement 59Impala59 General VW Discussion 2 February 5th, 2010 10:09
Procedure for rear motor mount replacement- 05.5 Jetta? chimmike VW MKV-A5 Golf/Jettas 0 January 6th, 2010 12:59
Motor mount inspection and replacement abctdi VW B5 Passat TDIs 17 November 5th, 2009 12:07

All times are GMT -7. The time now is 20:35.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.15440 seconds with 10 queries
[Output: 77.08 Kb. compressed to 67.74 Kb. by saving 9.34 Kb. (12.12%)]