911SC 3.0 Rocker Shaft

[kmkane]

I have a 79 3.0 that recently had a rocker arm shaft migrate, and break. I have not yet removed any other valve covers, but the other two shafts under the valve cover I did pull have also migrated.

I understand this is a common problem and I'll be replacing the damaged rocker arm, all 12 shafts, bolts, and nuts.

I'm planning on using some Loctite 648 oil resistant adhesive on the ends of the shafts to help prevent them from migrating in the future. Is there any reason to not use Loctite?

Loctite 648 is used internally on Rotax aircraft engines all the time as an adhesive, it's in the manuals to do so, but just wondering if anyone with more experience on Porsche engines has a reason to not do so. It's easy to break the bond with some heat, so I don't feel it would cause any problems when removing the shafts in the future.

[john walker's workshop]

Used parts torqued to the original factory spec is the usual reason. They need 18-20 ftlb instead of 11 ftlb. The bore for that broken shaft may be compromised now.

[proporsche]

Plus if the shaft is not in correct position it will move...Check the others

Ivan

[proporsche]

the shaft has to be in this place in the camshaft housing

[30westrob]

I would not use any adhesive. Per the posts above you had a torque or shaft position problem. I would not replace all hardware, just inspect and reuse as appropriate. Rob