After sifting through as many threads as I could find about CIS troubleshooting, I still have a few questions pertaining to the CIS system for a 1975 2.7 CIS 911S. I have been rebuilding this engine over the past couple of years and am finally getting close. Last items on the checklist include refreshing the CIS intake system. I have installed a pop-off valve, cleaned all components meticulously, and have started replacing parts that are too far gone.
First question:
Is there a sealant that should be used to mount the mass air flow meter to the air box? I purchased and installed a gasket (it had one sticky side which I adhered to the plastic air box. However, when I disassembled this part of the system, there was no gasket, but rather a blue, silicone-like sealant of some sort...
Here's a couple of pictures:
Second question:
Similar to my first question, should I use a sealant in addition to the O-Ring for the Throttle Body / Air Box Interface? Again, during tear-down I noticed that the O-Ring and O-Ring slot were coated in a blue, silicone-like sealant.
Here's a picture:
Third Question:
Are there specific torque specs for the mounting hardware for:
1. The Mass Air Flow Meter
2. The Throttle Body
3. The Bolts that mount the Fuel Distributor to the Mass Air Flow Meter
Fourth Question:
I noticed that there is a gap around the flap in the throttle body...is this going to diminish the efficacy of the system? Should I be concerned? Does it need to be replaced?
Here's some pictures:
Thank you in advance for all your sagacious advice. Please help me get this CIS sorted so that I can get back to burning rubber
