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Old 04-10-2012, 05:51 PM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,357
Mercedes 617 Harmonic Balancer problem

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Old 04-11-2012, 02:58 AM
Stretch's Avatar a shield of steel
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,453
My vote is to go for the drilling two new holes option.

I read somewhere (it might have been here it might even have been on BW) that you are better off getting 3 flute drill bits as they drill a round hole whereas the standard 2 flute HSS drill bits tend to drill a slightly oval hole. As we have seen oval holes are not what we want.

If you disregard the difficulty in drilling two good straight parallel holes the biggest problem that you'll have is stopping the crank from turning when you come to apply the monster torque to the 27mm hex head bolt.

I'm collecting good ideas for this problem here - the special tool post #9 is the one to get but it ain't cheap.

Has anyone ever made a good DIY tool to lock an OM617 flywheel?

Make sure you get the spring washers under the 27mm hex head bolt the right way round.
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior

Don't leave that there - I'll take it to bits!
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