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Don, based on your previous posts I have the latest Porsche fluid on order from Sunset. What should the drain & fill plugs be tightened to?
I agree it looks straightforward to do the fluid change. I'll send a sample to Blackstone. Thanks for all your efforts to document folks experiences with their transfer cases.
Rob
Rob - snug. Someone found 17nm or 13 ft lb in their manual - which is just snug. These are tapered plugs - if you over-tighten them you stand a chance of cracking the case.
Be very interested in what Blackstone has to say..
My dealer wants $300 to change TC fluid so I'll do it myself. They also want $500 to add the vent kit. The service adviser said I should wait for TC failure and then I would get the vent kit installed at no charge as part of TC replacement.
My CD is approaching 30K miles, no symptoms.
Your CD TC failed or just doing preventative? I thought CD TCs are different than V8, TT , GTS and V6 TCs.
Are there any tricks to getting the Durametric to display the transfer case value V40? I updated the software to 6.5.3.6 but under the all wheel drive menu it says communications error. Tried the car "on" and with car running, no joy. I can read out other items not from the AWD menu like engine management, etc. Any tips would be appreciated.
Question that I hope hasn't been answered already. I'm looking at 2013 that is just out of warranty and is not CPO. Soooo, I may be taking a risk with it (but of course the purchase price reflects such)...but is there a way for the PPI inspection shop to test the transfer case at the shop?
The case seems to be the largest unknown with used 958.1s...so I want to be sure I check that aspect. At the very least, I'll change out the fluid.
He mentioned two ways to know of you've got TC problems. One was the usual, go somewhere quiet and smooth, like a parking garage, open the windows and listen for clicking and the feel of skipping during turns. Just regular turns, not ones at full lock.
That and get all four wheels off the ground on a lift and manually turn one. If you hear TC case clicking then it'll need replacing.
As for clicking/sluggishness under power, disconnect the wiring connector into the TC and if the noise stops then it's due for TC replacement. Obviously you should not continue driving with it disconnected.
Nevermind...just saw this back on an earlier page.
The case seems to be the largest unknown with used 958.1s...so I want to be sure I check that aspect. At the very least, I'll change out the fluid.
Please keep in mind that this issue is not isolated to the 958.1 gen, it effects all 958s to include 958.2s as well. The only 958s exempt from the issue appear to be the diesel and hybrid models due to a different TC used for those models (because their PTM systems are different).
What kind of a torque wrench could be used to torque the fill plug and would fit in the area of the fill plug? I'm not sure how tight is "snug" and am afraid of over-tightening.
Originally Posted by CarGuyNVA
Please keep in mind that this issue is not isolated to the 958.1 gen, it effects all 958s to include 958.2s as well. The only 958s exempt from the issue appear to be the diesel and hybrid models due to a different TC used for those models (because their PTM systems are different).
I have a 2016 Cayenne S eHybrid and plan to change the TC fluid at 20Kmi with whatever OEM fluid part number the stealership sells (since I don't know whether the hybrid TC takes the same fluid as the non-hybrid TCs). I will also send the oil to blackstone for analysis.
Don mentioned someone found a torque spec of 13 ft/lbs which most larger torque wrenches probably can't do accurately. The other choice would be to go to an inch pound torque wrench. 13 ft/lbs is 156 inch/pounds. Over tightening can crack the case.
Today I had the transfer case fluid changed in my 2015 Cayenne Diesel to ward off evil spirits. The fluid had 30K miles on it and was a bit darker than the new fluid. I supplied the latest fluid ( P/N 000 043 305 63 ) to the dealer since they didn't have it in stock. The value of V40 was 11070 whatever that means. My car is equipped with a transfer case bearing P/N 958 341 020 03 which is believed to be unique to the diesel and hybrid Cayennes. The tech told me they have not had to replace transfer cases on the diesels and the hybrids. The transfer cases on gas powered cars were not as well behaved..... It had no vent line installed. I will send off the sample to Blackstone and post the results when they are available.
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