SeanR

I didn't think about that angle, hell, he's a full foot taller than I am.

ROG100

Most people are 8>)

ROG100

I learn something new about these cars every day.

According to PET the 5 way is for the stick cars and the 7 way for auto.
Not so it would appear.
If the 5 way is the norm be it stick or auto where do the connections go.
1) Main connection to TB
2) 3) & 4) are to the fuel pressure reg/dampeners
5) to the auto box or where ????
Roger

the flyin' scotsman

Roger........your correct.

The 5 way is fed from the throttle body and supplies the 2 dampers, the regulator and the auto tranny with vacuum.

Perhaps the 7 way is for older (pre S4) cars?

Landseer

The PET I referenced for 1987 shows alternatively 5 with 1 plugged, 5, or 7 depending on..... some german writing I can't read.

(EDIT --- not a PET, the PDF on the CD's for the 87 model service. Am I the only person that has this doc? I can't figure out how to copy/post the picture)

the flyin' scotsman

Perhaps the 5 way with one plugged is for a manual transmission car............the 7 way is a mystery, to me anyway.

ROG100

The 7 way is used on the auto 85 to 86 cars IIRC.
The 5 way works for the manual cars if you plug one port.
That answers it then I think.
No need to offer the 7 way anymore on the 87 to 95 cars.
At $25 it was getting way expensive anyway.

Landseer

The picture shows a 7 with 1 plugged. Perhaps a certain country application other that US. Again, no speaka the language.

Dwayne

Hello Gents,
There are two lines coming off the "Y" from the 4-way. These two lines go into the fender well. One line feeds the Vacuum Reservior (pod) in the fender well as Bill describes. The other line is connected to the cruise control vacuum servo also located in the fender well. Each of our sharks have this "Y". It looks normal on yours as well.

Bill Ball

Vacuum cruise control....OK. I forgot that 87 was the last year for that. That explains the Y on the 4-way, absent from 88 on. Thanks Dwayne.

928autobahndreamer

Thanks for all the great info guys. Once again, rennlist amazes me with its cummulative knowledge of all things 928. I'm glad my 87 has not been Frankenstiened with its vaccum line configuration. It is hard enough for me to get my head around the vaccum system without mine being the only one set up this way. At least this way I can rely on you guys to keep me from getting too confused.

What prompted some of my current confusion was a couple of things. I noticed in Dwayne's write up that he has a 7 was splitter as seen in this attached picture. You can tell that a least on port is plugged. Also, Roger's list of parts showed that I should have a 7 way. Given these two bits of info, I assumed my car was wrong.

Once again thanks to everyone who continues to share there 928 experience here. And a big thank you to Dwayne who has submitted a priceless guide with his current writeup. I am following this as closely as my inept abilities will allow.

928autobahndreamer

After looking at Dwayne's pictures some more I realize just how much more cleaning I need to do on my engine bay. What do you guys use to degrease. Parts store engine cleaner, citris degreaser, what works best and is least likely to eat neighboring rubber bits that may come in contact with the cleaner?

Also, how do you get the bolts, clamps and other plated metal parts to look so good? I have gotten some Mother's mag polish to get the aluminum bits shiney, but I don't know about a lot of the little bits.

Dwayne

Thanks for the feedback. I'm glad you are finding the post useful.

My 7-port vacuum manifold has 2 plugged ports (with metal plugs). Your 5-port will work just fine and you shouldn't have to use any plugs. I amost switched to a 5-port but decided to stay with the 7.

For the cleaning, I use Orange Blast Citrus cleaner for most of the cleaning - rubber, plastic and metal. However, many of my bolts, washers, clamps and other exposed anodized metal parts had light corrosion. I used a wire brush or a wire wheel attachment to the bench buffer or a wire wheel attachment on the dremel to clean these depending on what fit best. After getting the corrosion off and metal exposed, I used the Mother's aluminum mag polish you describe to shine them up and add protection from corroding so easily again. Some bolts/washers I simply repainted gloss black. One part, the cables bracket on the side of the plenum, I simply replaced with a good used one that was in great shape with no corrosion (thanks 928 Intl!). Let me know if you would like to see some pics and I'll post them up.

StratfordShark

When I have any part out I try to clean it up as much as possible before replacement if I'm not changing it entirely.

With bolts I've used wire brush on drill or dremel like Dwayne, but I'm concerned that in some cases it's removed protective plating.

I cleaned up the intake sideplate allen head bolts this way, and the 3 bolts holding on throttle bracket, fuel rail cover bolts and coolant crossover bolts.

About a year after cleaning the above, I noticed a little rusting on some of them! I was sufficiently concerned to buy new replacements for all of them, and once I have finished fitting new shocks I'll replace all the ones I 'cleaned'.

Any comments on using wire brush on plated parts in this way? How could I have prevented any corrosion after cleaning them? Does metal polish have a protective role as implied?

Dwayne btw I was so inspired by your thread on brakes that I polished the dustshields at rear when they were off car for shock replacement. They really do come up with a mirror finish (I used Autosol metal cleaner here in UK).

On a 20 year old 928 I do find that on some jobs I spend more time trying to get parts clean than the actual 'job time'!

I've also looked longingly at those parts cleaners some of the auto tools people have - big vessels in which parts are immersed in cleaner and presumably agitated in some way?

Dwayne

I've had the exact same experience you had! On California ('84), I cleaned all the bolts and washers and removed the plating in the process. They were nice and clean and shiny for a short time but quickly became dull. Shortly after that, several developed rust and I ended up replacing some of those. Not wanting to repeat the same learning experience, on Virginia ('87) I wanted to try the polish as I noticed it had some water repelling properties. I'll be monitoring these closely but it's too early to tell if the polish will help significantly. Like you, I'm also interested in proven methods others may have discovered.

Ditto on the time spent on cleaning - I consistently spend more time cleaning than on the actual repair. It's a labor of love!