Tom M'Guinn

The FSM says to install the knock sensor with a new 'microencapsulated" bolt. The bolt I removed is standard enough in size, but shows the remains of blue goo -- "microencapsulation" material presumably. Anyone have the part number for said bolt? PET is not clear to me on this and the regular 944 stores don't seem to stock it. Thanks.

KuHL 951

All that means is that the original bolt came with a hard microencapsulated sealant already bonded to the bolt that activates once it's cut and torqued then acts like any thread sealant and locker. I've replaced knock sensors on many cars and used the Loctite Blue. You can buy new bolts already coated but why pay for a specialized bolt? They just want make sure the bolt is firmly in contact with the block for the sensor to pick up a repeatable signal; if the bolt works loose at all the knock sensor will not work.

http://solutions.3m.com/wps/portal/3...r/Scotch-Grip/

Tom M'Guinn

Wonder why they didn't specify loctite?

KuHL 951

Probably the same reason they assume you will never pull the head studs. The FSM doesn't cover that either or why doesn't the girdle sit flush on 2nd assembly? All they are trying to do is make sure the bolt doesn't back off. Maybe they have a factory part you can buy with the threadlocker on it already but all PET says is it's a standard M8 x 28 hex-head bolt (#N 010 233 6). I gave up trying to figure out what they were thinking with these engines.

You can always buy a 3M 'microencapsulated' coating and do your own but it seems sort of pointless to me.
http://multimedia.3m.com/mws/mediawe...6EVs6E666666--

hosrom_951

When i removed the sensor to re-wire the terminals, i re-used the bolt without washer as the manual stated, no problems, no loctite as well.

I believe this is because they want the bolt to receive all the 'noise' and go straight to the sensor, and not have a washer interfere with it?

eniac

J-B Weld