PeachParts Mercedes-Benz Forum - View Single Post - Should My 6 OM617 Crank Pulley Bolts Have Washers?

cjbrown · #9 02-04-2013, 06:48 PM

All six of mine sheared off on my pick up trip from South Dakota. Got within 200 miles on the 1300 mile trip and I heard a clanking noise and then the warning lights came on. Main pulley had sheared off. I got a AAA tow the rest of the way home, they billed $1500 for the flatbed tow.

The were sheared off flush so a quick drill and ez out and had them all out. ACE replacements, but I don't know what I put in there, probly 12.9.

A lot of people get confused about metric high tensile bolts. While they are stronger they are more brittle and particularly when used in a shear load they can...shear off. LOL.

Spring washer will keep them tensioned, but locktite is fine too.

I wondered why I heard an odd clanking noise every time I stopped at a rest stop or for gas. The diesel is noisy anyway, so didn't pay enough attention.

Have put about 5K miles on the car without issue, so I'm not sure it's that critical. As long as there are six of them in there and they are tight. The rad has to come out to get to them.