fortysixandtwo

Loctite 574 (the orange colored stuff) is an anaerobic flange sealer (cures in the absence of air, and only in small spaces), typically used between two machined metal surface. The type of metal will even influence cure time. I'm not surprised that its use, in that application, has not stopped the oil weep.
An RTV sealant/gasket maker would be a better choice. I'm a fan of Permatex Ultra Grey, but just about any one should work. Make sure the sealing surfaces are perfectly clean. Brake cleaner works really well at removing oil from the surfaces. When the surfaces look brand new, clean them again...

michael2e

Thanks for that recommendation I'll try it. Do those bolts have a finite life (i.e. perhaps stretch with multiple reuses)? Anyone tried using an extra washer at the top of the bolt above the domed washer to effectively shorten it thus increasing clamping pressure? I dont understand the design of those things with the thread depth limiting feature. Seems silly to have to use RTV.

fortysixandtwo

I can see where the bolts could break if too much torque is applied (tightening or loosening). They are not a yield type fastener, so reuse should not be a problem. I've never broken one, but when the do break, I think its the necked down area, above the threads, below the head, that twist and separates.
Maybe the sealing washers have crushed too far http://www.944online.com/cgi-bin/ASI...key_1108220044

shepo1

had same problem on 89s2 changed thrust rings 92810411502 x13 & sealing rings 92810444308 x4. no more oil leak.

mhr

I figure while I am doing it I will also on change

13 x 928-104-116-00 thrust washer
2 x 928-104-485-01 cover (And associated sealing ring and circlip)
928-104-447-09 valve cover gasket

Also going to get the actual cover powder coated black while it is off

michael2e

Shepo I think you are exactly right about the thrust rings (92810411502). They must shrink/deform over time with heat such that they dont allow for sufficient clamping force even after fully torquing the bolts to spec. I replaced the 4 sealing rings but that alone didnt solve the problem. After thinking about it for awhile now I believe the design of the bolts are such that beyond a certain point any further tightening is not possible as a result of the fixed depth of the threads by the integrated set washer at the top of the threads. So if the thrust ring is worn to the point of being compressed no amount of tightening will allow proper sealing. And then inevitably when we try to tighten the bolts just a hair more which is all it would normally take these stupid things snap. Perhaps someone can explain why Porsche went this route?

Grandpa#3

Money, Money, Money in parts sold, and for their mechanics not to over torque (7 ft lbs) the bolts. Check out the link below about Cam Chain Pads.

http://www.944online.com/cgi-bin/for...num=1294429355

Cheers,
Larry