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Serrated Alternator Pulley Bit SET

Pricing: $29.00


IMPROVED! This specialty 33 spline bit (official tool No. 3400) is supplied with a 17 mm hex body for use in your box wrench.

Applications include


1999-2003 Mk4 Golf TDI with ALH Engine Code
1999-2003 Mk4 Jetta TDI with ALH Engine Code
1998-2003 Mk4 New Beetle TDI with ALH Engine Code
2004-2006 Mk4 Golf TDI with BEW engine Code
2004-2005.5 MK4 Jetta TDI with BEW engine Code
2006 Mk4 Jetta Wagon TDI with BEW engine Code
2004-2006 Mk4 New Beetle TDI with BEW engine Code

alternators and many newer models with freewheeling pulley hubs.

This NEW KIT includes new special compact M10 triple square 12 point bit and the T50 6 lobe bit that are used to reach down the center of the serrated bit and are EXTRA SHORT to work with the engine in the car in most applications.

Not for impact tool usage.


  • MN3400
  • MN3400
  • Metalnerd
  • New

Shipping Information

  • Item Requires Shipping
  • 0.0 lbs.
  • W5.0000” x H5.0000” x L5.0000”

Customer Reviews

Comment Total Reviews (2)

Another great Metalnerd Tool!
  • Currently 5/5 Stars

Reviewed by: Guest12/26/2015 07:00AM

Purchased from: KERMATDI

Tool works exactly as expected. Squirt some penetrating oil in the opening, insert the proper bit for your alternator shaft, add a length of cheater pipe to your tools for leverage on the twisting action, and Bingo the pulley with 11 years and 198k miles came right off the alternator of my MkIV while still mounted in the car. Installation was a breeze as well. I'll keep this great tool around for when my MkV needs its alternator pulley replaced.

This is the third Metalnerd tool I own, each of them does exactly what it is supposed to do, and does it well.

Worked Like A Charm
  • Currently 5/5 Stars

Reviewed by: Guest02/25/2016 07:00AM

Purchased from: KERMATDI

Wow, it worked!! That pulley was on TIGHT but it came off-- without breaking anything! Without taking anything else off! Without a torch or impact tool!

Tips: Make sure you use correct bit, on mine the correct splined bit was a very snug fit, and required gentle tapping to seat fully. You need a 12mm socket and 17mm box end wrench. The pulley thread is regular (right-handed) so you unscrew the outer part of the tool (the hollow splined part) as you hold the central bit with the 12mm. Of course, with a ratchet on the center you can hold the outer part fixed and turn the ratchet clockwise. (you are really turning the alternator shaft)

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