4 replies to this topic

[Java_Green]

I have a question considering of choice of crank pulley bolt.

 

A crank pulley, matching pulley damper and a locktab have arrived from MS. Yesterday when I inspected the items, I found out that the crank pulley center is 6mm longer (roughly the same distance to timing cover) compared to the original pulley (with integrated damper). This will make the bolt take far less threads and result in large tensile stress in the crankshaft even further out towards the end of the crankshaft. This is of course less favorable and could jeopardize the threads in crankshaft as well as making pulley and damper coming loose. MS do have a longer bolt available, but that is with an allen key interface (only god knows what they were thinking about there…) making no use of the locktab. Another option is to buy a longer bolt (with a proper head) from MED, but that is close to priced for its weight in gold.

 

All thoughts or experiences to share on the subject are welcome.

[mini13]

https://www.minispar...|Back to search

Make sure you get a 1/2"  hex socket to fit it

[GraemeC]

I don't think the MED one works with the locktab either as the washer is 'built in'.
Just use the MS socket head with threadlock - probably far more reliable than the locktab anyway.

[Java_Green]

I have been thinking about this a couple of more runs. From the top of my head I do remember that the bolt mating surface on the pulley is far proud of the end of the crankshaft end. That would make it possible to put up the pulley in the lathe and lower the bolt mating surface to a height just proud of the crankshaft end (a couple of millimeters to ensure proper clamping). By doing so I will get a longer interacting thread length and still a proper hex bolt. Perhaps it will end up with that the bolt head is to deep into the pulley for using the locktab, but I guess threadlock will do. There might be a purpose with the increased center length of the pulley that I am missing...!? 

[Spider]

For what ever it's worth, I gave up using the locktabs on the Harmonic Damper a very long time ago. I've been using Loctite 243 and never had an issue with the bolt coming loose since. It's important to clean the threads before applying the Loctite.