Intake manifold nuts

[hughc]

I'm in the process of installing the CIS to the engine. Was hoping to finish before going to bed
My problem is that I can't find the torque value for the manifold nuts in my Bentley so I'm hoping someone knows off hand what it is and share it with me.
Thx
Hugh

[hughc]

I should have mentioned that its an 83 sc.

[john walker's workshop]

8mm fasteners max 18ftlb. Probably wouldn't go quite that much for fear of breaking the mounting flange on the aluminum runners.

[hughc]

Thank you John.

[boyt911sc]

Originally Posted by hughc

I should have mentioned that its an 83 sc.

Hugh,

In all the years I’ve been tinkering with CIS, never used a torque wrench for tightening these nuts. Just make them tight and snugged by feel (finger tight). You brought up something interesting and I will measure the torque value to satisfy my curiosity too. Actually, I am installing a complete ‘83 CIS unit next week with the engine installed.





While I prefer to do the installation with the motor out of the car, I decided to find a technique or method installing the complete CIS unit in situ. My goal is to install the complete CIS unit in situ under 30 mins. or less by myself safely. The biggest hurdle for me at this point is my bad back and will probably do this with an assistant.

Tony

[hughc]

Originally Posted by boyt911sc

Hugh,

In all the years I’ve been tinkering with CIS, never used a torque wrench for tightening these nuts. Just make them tight and snugged by feel (finger tight). You brought up something interesting and I will measure the torque value to satisfy my curiosity too. Actually, I am installing a complete ‘83 CIS unit next week with the engine installed.





While I prefer to do the installation with the motor out of the car, I decided to find a technique or method installing the complete CIS unit in situ. My goal is to install the complete CIS unit in situ under 30 mins. or less by myself safely. The biggest hurdle for me at this point is my bad back and will probably do this with an assistant.

Tony

Good luck with that one Tony..
I put the CIS unit on my engine last night and it took several hours. And the engine is out of the car
Admittedly I dont have your experience so I took my time so as to not screw up too much.
As you are well aware some of the manifold nuts are next to impossible to get at, especially the rear nut at #6 but I got them all tight and certainly more than finger tight.
I actually had to remove some of the piping to the AAV and deceleration valve to facilitate getting at that but.

Unfortunately two of my hot air hoses broke, because of age I suppose so that will delay me as I wait for new ones.
I also broke the tab on the sensor that sits on top of the pcv plate. Not sure what its called.
I was able to repair it but given its location I think I'll just order a new unit.
What is that sensor called and is it generic that I can get one at the local auto parts store ?
Next I'll have to read up on the smoke testing thread so that I can re-assure myself I have no air leaks.
I really would like to get the engine in the car asap but it's the waiting for parts that's holding me back.

I would like to suggest that you consider trying CBD oil drops or capsules to alleviate your back pain. (If its legally available in your area).
I've heard good things about CBD and it certainly is safer than the chemicals your doctor might be prescribing.
Cheers

[911pcars]

FWIW, there are M8 flange nuts with a 12mm hex (as opposed to 13mm). Makes for easier access to R&R/access the intake manifold nuts. Unfortunately, I forget where I sourced them.

Sherwood

[hughc]

Originally Posted by 911pcars

FWIW, there are M8 flange nuts with a 12mm hex (as opposed to 13mm). Makes for easier access to R&R/access the intake manifold nuts. Unfortunately, I forget where I sourced them.

Sherwood

As it turns out the nuts on my vehicle are all 12mm
No doubt the job would have been somewhat more disagreeable with 13mm nuts.
Anyway, it's done now and I hope not to have to re visit that job until the engine next comes out.
Cheers

[boyt911sc]

Originally Posted by hughc

As it turns out the nuts on my vehicle are all 12mm
No doubt the job would have been somewhat more disagreeable with 13mm nuts.
Anyway, it's done now and I hope not to have to re visit that job until the engine next comes out.
Cheers

Hugh,

The original 12-mm nuts for 8-mm studs for the CIS intake runners are self-locking nuts. They are not the typical fasteners you could easily find and buy these days.

Tony

[911pcars]

Hugh,
Wait a sec. I had a nagging feeling I was incorrect.

I don't have an SC. According to the parts catalog, the factory SC in. manifold nuts are a locking-type M8 (deformed thread?) but don't specify the hex size, so probably 12mm as you report.

My 3.2 came with M8 barrel nuts with an internal hex. I replaced them with M8 flange nuts that have a 10mm hex - for better access from different angles.



Sherwood

[gazzerr]

>Actually, I am installing a complete ‘83 CIS unit next week with the engine installed.

Tony wha????

Just kidding. Interesting to see how you go with it. I couldn't get it to go in assembled. There was not enough room. It might fit in with a partial drop as low as you can get it.

[Bigtoe32067]

Dang, you guys are studs!
It takes me more than 30 minutes to round up my tools and psych myself up.
Tony (another one)