Flywheel bolt torque?

[78F350]

Originally Posted by JFP in PA

And for your reference, the was a later supplement to the Porsche service manual (a3050371, dated 2002) which reads:

"25 Nm(19 ft. lb.) plus 120 degrees."

That later data remains current according to Porsches electronic information system, PIWIS TSI.

Always makes me feel good when my manual agrees with JFP.

[spendy]

Originally Posted by JFP in PA

This is one of the reasons why Porsche uses “micro encapsulated” single use fasteners in several locations (like the flywheel),

Is this true with all engines? The OEM FW bolts I ordered for my 2.5 are not micro encapsulated. 999 073 092 02 Did I get the wrong ones?

thanks

[PorscheFan5]

Thanks all.

[JFP in PA]

Originally Posted by spendy

Is this true with all engines? The OEM FW bolts I ordered for my 2.5 are not micro encapsulated. 999 073 092 02 Did I get the wrong ones?

thanks

Not all engine's use them, but the M96/97 did. The bolts should have a blue-green area on the treads that is the micro encapsulated thread locker. If they do not, just use Loctite and you will be fine.

[PorscheFan5]

Originally Posted by JFP in PA

Porsche factory components are "somewhat" balanced, but probably not to the RPM levels the electric motor can turn. You might want to consider having an engine balancing shop true yours up.

JFP,

I checked with a local Machine Shop and they indicated that they balance at 500 RPMs and that's it. They indicated that that is what most shops will do. Given that then does it still make sense on spending $150 and taking the DMFW to the shop to zero balance at 500 rpm?

Separate question, how do people know that their FW is worn out and they need a new FW? My Boxster has 59K miles on it. To me the FW looks pretty good. Also With the EV I am not going to be shifting much and hence the FW (and Clutch) won't wear down as much. How do I make sure that I have reasonably ok FW? If I post some pictures, could someone who knows this stuff make out or it has to be physically examined?

Sorry of my questions are real basic...

[JFP in PA]

Originally Posted by PorscheFan5

JFP,

I checked with a local Machine Shop and they indicated that they balance at 500 RPMs and that's it. They indicated that that is what most shops will do. Given that then does it still make sense on spending $150 and taking the DMFW to the shop to zero balance at 500 rpm?

Separate question, how do people know that their FW is worn out and they need a new FW? My Boxster has 59K miles on it. To me the FW looks pretty good. Also With the EV I am not going to be shifting much and hence the FW (and Clutch) won't wear down as much. How do I make sure that I have reasonably ok FW? If I post some pictures, could someone who knows this stuff make out or it has to be physically examined?

Sorry of my questions are real basic...

Try a better balancing shop. In any case, even lower RPM balancing is better than not.

There is a standard factory test for the dual mass that measures twist of the elastomeric component. Porsche has released a Technical Service Bulletin on checking the dual-mass flywheel (TSB 911 8/02 1360). Basically, you are looking for a maximum of 15MM movement between the segment's.

Here is the bulletin for the 996, which is basically the same: http://www.pelicanparts.com/techarticles/Boxster_Tech/44-TRANS-Clutch/DualFlywheelTechBulletin.pdf

[PorscheFan5]

Thanks JFP!

When I read your response, I said great, now I can check my FW. Then I said wait, it said twist and how am I supposed to twist it? Rather than ask the stupid question on the forum I searched youtube and found my answer...

https://www.youtube.com/watch?v=uLp6nlYMssA

I will check it out. Also will check another machine shop.

Cheers for now.

[Meir]

Originally Posted by 78F350

Always makes me feel good when my manual agrees with JFP.

i stand correct, as the manual i have is from 98.

[JFP in PA]

Originally Posted by Meir

i stand correct, as the manual i have is from 98.

You should check around and see if anyone is selling the supplements, there were over 100 of them for the 986's, some with as many as a dozen individual pages.

[PorscheFan5]

I found a good shop that can do the balancing.

Question: Does anyone know if the Boxtser 2.7L engine is internally balanced or externally balanced? The shop owner (it is a racing shop), who is quite knowledgeable, asked the question...

Cheers.

[JFP in PA]

Internally balanced .

[PorscheFan5]

JFP,

Attached are some pics of my DMFW before clean-up. Would you agree that it seems in good condition? I tested based on the testing procedure you posted. The twisting results in deveation of about 10-12mm. So that is good. It is identical on both sides.

However, the FW does not go back to the original position (center) when released after twisting. Please tell me that I don't need to get another FW... I am planning on taking the FW for balancing today. Hopefully you'll see this message and are able to respond.

Thanks!

[JFP in PA]

Originally Posted by PorscheFan5

JFP,

Attached are some pics of my DMFW before clean-up. Would you agree that it seems in good condition? I tested based on the testing procedure you posted. The twisting results in deveation of about 10-12mm. So that is good. It is identical on both sides.

However, the FW does not go back to the original position (center) when released after twisting. Please tell me that I don't need to get another FW... I am planning on taking the FW for balancing today. Hopefully you'll see this message and are able to respond.

Thanks!

The flywheel should return to its original position after being tested. If it does not, the elastomer is failing and the unit needs to be replaced.

[PorscheFan5]

Thanks JFP.

Bummer. Now I need to get a DMF now...

While I am replacing the DMF, and given that I will be mating it with the Warp 9 DC motor and not the engine, should I go for a single mass FW? My clutch remains the same, correct?

Thanks!

[JFP in PA]

Originally Posted by PorscheFan5

Thanks JFP.

Bummer. Now I need to get a DMF now...

While I am replacing the DMF, and given that I will be mating it with the Warp 9 DC motor and not the engine, should I go for a single mass FW? My clutch remains the same, correct?

Thanks!

If I understand you DC set up, it is a constant torque at any RPM. If that is the case, you can use any flywheel that is properly balanced.

[Jake Raby]

Getting back on topic....
Just finished editing the 996 and 997 today. We hadn't planned on a Boxster version, but can do one.
Sounds like you guys need this:
Here's a copy of the cover

[PorscheFan5]

JFP,

Thanks for your response. Therefore if I can find a DMF for and S model, would that work too? Is the fitment and diameter same or different? Can I use my exisiting Clutch with an S-FW? Or do I need to change clutch too?

Appreciate all the help! Thanks!

[Paul Lohman]

Originally Posted by JFP in PA

There are not two procedures, there are two stages; for the flywheel bolts (new only, do not reuse), torque to 19 ft lb, then tighten another 120 degrees of rotation to gain the correct bolt stretch. For the pressure plate, torque to 17 ft lb.

Is 17 ft lb correct for the clutch pressure plate. Installing soon. Thanks.
2001 Boxster S

[JFP in PA]

Yes, new bolts only, dab of blue Loctite.