Clutch Judder K7003801

garciapiano

Veteran Member
Joined
Feb 12, 2018
Location
Southern California
TDI
1997 Jetta TDI (1Z)
I've always experienced a significant clutch engagement judder with my TDI - both with the original clutch and after a by-the-book replacement with the stock Sachs "Quiet" K7003801 clutch. Brand new stock Sachs flywheel. Flywheel and pressure plate torqued to spec evenly. I have stock hydraulic mounts, save for the front mount which is the BFI stealth poly mount. All mounts are in good condition and installed correctly. But, the entire car vibrates when the clutch is slipping. I've just figured this is a characteristic of the mk3 platform and diesel engine. Maybe I'm not revving it up enough when clutching into 1st?

The judder is much less obvious when the engine is warmed up. I'm just curious if this is just a TDI thing... I haven't driven a gas clutch that judders as much as the TDI clutch.
 
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ToddA1

Top Post Dawg
Joined
Aug 3, 2011
Location
NJ 08002
TDI
'96 B4V, '97 B4, '97 Jetta
Maybe it’s the poly mount? I don’t experience this on my cars.

-Todd
 

garciapiano

Veteran Member
Joined
Feb 12, 2018
Location
Southern California
TDI
1997 Jetta TDI (1Z)
Maybe it’s the poly mount? I don’t experience this on my cars.

-Todd
Are you stock fuel and tuning? I am Malone Stage 2 with the DCL 1019s... so maybe it could be my slightly more aggressive tune. My guess is the IQ is a bit different on the cold start and that could be causing some of the roughness. Mount could definitely be part of it as well.
 

ToddA1

Top Post Dawg
Joined
Aug 3, 2011
Location
NJ 08002
TDI
'96 B4V, '97 B4, '97 Jetta
Two cars are stuck. One car has a Kerma tune with DLC1019.

-Todd
 

Mongler98

Top Post Dawg
Joined
Mar 23, 2011
Location
Northern MD (HAGERBUSH)
TDI
98 Jetta TDI AHU 1.9L (944 TDI swap in progress)
Did you replace or resurface the flywheel? A improperly bedded in or flywheel with hot spots will do this.
 

garciapiano

Veteran Member
Joined
Feb 12, 2018
Location
Southern California
TDI
1997 Jetta TDI (1Z)
Did you replace or resurface the flywheel? A improperly bedded in or flywheel with hot spots will do this.
Whelp, sounds like I probably messed up my new flywheel. Not sure how I’d drive it differently since I am not someone who rides the clutch.

I’ll try a stock front mount and see if it helps any.
 
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Steve Addy

Top Post Dawg
Joined
Aug 7, 2002
Location
Iowa
TDI
97 Mk3
Whelp, sounds like I probably messed up my new flywheel. Not sure how I’d drive it differently since I am not someone who rides the clutch.

I’ll try a stock front mount and see if it helps any.
I wouldn't write off the flywheel yet...

Steve
 

Mongler98

Top Post Dawg
Joined
Mar 23, 2011
Location
Northern MD (HAGERBUSH)
TDI
98 Jetta TDI AHU 1.9L (944 TDI swap in progress)
Take a look at the BFI mount. I'm assuming you used the replacment bolt that came with the kit?
I did. They sent the wrong one or something but the bolt was a little bit longer than it should have been. It caused a lot of shaking like you described.
Worth checking out.
 

h.ubk

Veteran Member
Joined
Sep 23, 2016
Location
Idaho
TDI
1997 Jetta TDI with 1Z Engine
I don't think this is a part of the MK3 platform. Mine doesn't do that.

h.ubk
 

garciapiano

Veteran Member
Joined
Feb 12, 2018
Location
Southern California
TDI
1997 Jetta TDI (1Z)
I got the OEM front mount and threw it on. Definitley a more isolated ride than the BFI front mount. With OEM mounts all around, the slight judder during clutch slip is certainly still there but the car is generally more tamed, so I like that. Not sure how long these mounts will hold up under Stage 2 driving, though. At this point I've pretty much given up on having that "transparent" gas-like clutch action.
 
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