[KRAG50]

Got it>

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[Rob in Oz]

Here's a valid link to Sparky's procedure on Porsche968UK...



http://www.porsche968uk.co.uk/technical_...ing-01.htm



Rob

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[KRAG50]

Cloud 9 68 was kind enough to scan and send. but thanks.

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[jsheiry]

Getting mine apart now and getting worried about the re-install of the cams and cam timing.



Lots of specialty tools needed. Any known source of borrow/rent for the ones that are needed?

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[flash]

not likely. having the special tools is a large part of how shops make their money. you would basically be taking money out of their wallet, as with the tools out of the shop, they can't do any other jobs that need them. getting them back in a timely fashion, and sometimes just getting them back at all, is typically a common problem too. hence, not many places loan or rent them. it's really bad business, no matter how "cool" it might be. i did it when i had my shop, and regretted it just about every time.



the good news is that you will need them again, so it helps offset the cost.

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[Husky1]

Has any additional info on cam timing from RS Barn been posted anywhere or does anyone have it? I am in process of having to set cam timing & would appreciate additional info & pictures(such as pictures of indicator setup & how you supplied air to vario cam).

 

Any help is appreciated

 

Jeff

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[MLB]

Hi Husky

There's a number of good threads here and associated docs for setting can timing

I just did my cam timing last fall, with 2 dial indicators and its worth buying some special tools from Porsche: (see the WSM)

The formed wire tools that hold the variocam compressed, and the pin that holds compression on the hydraulic timing belt tensioner are cheap. Also the bent dial indicator extension is cheap. I improvised the long strait wire for the indicator on top of piston 1.

The way Porsche sells the cam saddles is an expensive mess though. If you have access to machining tools you can drill slightly larger holes in the saddles that come with the threaded rods, allowing them to fit over the 968 cam saddle thread sleeves which are bigger than those of the 944. That's what I did, and this set of tool pieces was about $200 I think.

Finally, get the adapter flange for pressurizing the variocam (I used my shop air compressor with regulator) the flange is only about $20 from sunset.


Hardest part was pulling together the WSM instuctions along with the posts of others, to understand how to do the procedure. But if I was able to puzzle it out I'm sure you'll do fine.I just had to get in there and set everything up and take it one step at a time essentially following the workshop manual.it eventually made sense :0)

Can't seem to post a pic from my iPhone though, but the WSM pics actually do show what you need to do.

--Michael

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[Husky1]

What is WSM instructions? I already have all new parts installed just need to set timing

 

thanks

 

Jeff

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[MLB]

Hi Jeff, apologies for the shorthand, around here WSM means the Workshop Manual

Do you have a copy? You'll find the procedure in section 15

Let me know how I can be of further assistance

PM me, and we can also discuss by phone if you want

Regards,

--Michael

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[Husky1]

After posting I realized what you meant. I do have the manual & waiting for the adaptor from Sunset. It should be here by the weekend & then hopefully I can finish this project. I am sure I am making this more complicated than it really is.

 

Thanks

Jeff

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[MLB]

Sounds good. If you've worked on engines before it'll probably come easy for you. I don't have a lot of experience, so this was the most unnerving car repair I'd ever done, risking disaster to the very beating heart of what my daughter calls daddy's "zippy" car. I spent night after night reading and re-reading all the info I could find here, and a couple forum members were especially helpful and it all sorted out when I got in there and just did it. So it was all worthwhile when I could finally start er up again.

Good luck!

--Michael

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[williamoss]

I just tried to open the two PDF files as shown under the photo, I am using windows 8 explorer 9, and got a message saying could not open the file?

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[Husky1]

What is supposed to happen when you supply air to variocam? I supplied air & didn't see anything happen. Is this correct?

 

Jeff

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[MLB]

Hi Jeff

Assuming you've applied the right PSI level continuously, it will expand the Variocam mechanism which exerts pressure on the timing chain to simulate the advance timing position.

(At least that's my understanding)

While you have constant pressure applied (and you will hear air continuously hissing from the check valve), you rotate the engine as described in the workshop manual to lock in the cam timing, when cylinder number one is about 15 to 20 thousandths from top dead center. (i'm going from memory here so trust what the workshop manual says)

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[Husky1]

Thanks for the help. I think I got it. Hope to have is back on the road in next few days.

Thanks Again

 

Jeff

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[netopyer]

I know this is an old thread, but  i have a question.

form what i know, the Sparky's manual is here:

http://www.porsche968uk.co.uk/technical_...ing-01.htm

 

my concern is point 6.

page says, that when the pressure applied, and no voltage,   variocam piston is UP and the engine is  in the torque timing position (intake cam advanced) which i find wrong.

when the  variocam piston is UP, the upper  length is bigger, which means right, intake cam will rotate anti-clockwise  relatively to left, exhaust cam = intake cam retarded, not  advanced/torque positioned as stated.

then i find the two points reversed, which is also supported by the information that  the variocam solenoid is energized at idle, de-energized at  operating range, and energized again after 5500 rpm or what is the switch off point.(have to test that on the car)

am i right guys?

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