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Old 04-06-2017, 05:38 PM   #1
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Weird torque 80Nm for the automatic transmission oil pan fill plug?

80Nm( 59Ft-lb) is unarguable torque instruction found in all the water-cooled Porsche service manuals 2005-2009 Porsche 987.1 Cayman , Boxster 986 A86.00 Tiptronic -99 A86.05 00- A86.20 and 2005-2009 997: the Porsche shop manual, Bentley, 101 projects by Dempsy, and 986, Rennlist, Renntech forums searched.
https://www.renntech.org/forums/tutorials/article/68-tiptronic-transmission-service/
https://rennlist.com/forums/diy-submission-forum/956177-diy-to-drain-and-refill-cayman-boxster-987-1-diff-and-tiptronic-transmission.html
DIY: Tiptronic S Filter/ Fluid change

On planning the second DIY tranny fluid partial change of my '99 986 tiptronic ZF 5HP19 green tagged , I become to feel weird of this unusual high torque for the usual-looking tranny oil pan(except 27 Pan-Head Screw).
It is more than ball joint torque of the robust Porsche LCA(lower control arm=wishbone) 56Ft-lb(76Nm).
I couldn't see so much enforced portion there around the large M30-1.5mm filler female port. Most modern Mercedes including 722.9 late tranny specify this torque value 22Nm for M12-1.5mm drain/fill plug, and 20Nm for my MX-5 M12-1.5mm.

So,searched and found this https://www.youtube.com/watch?v=S8jcRd4gyWc&t=134s
showing ZF ServicesNA's general instruction published Jun 24,2014 demonstrating side fill plug -typed pan; see 7:22 min.
35Nm for fill plug 5HP19 &5HP24
100Nm for fill plug 5HP30
Also mented for drain plug, see 5:40min;
30Nm(Porsche shop manual 40Nm) for 5HP19 &24,
70Nm for 5HP30.

I don't know whether Porsche changed or reconstructed only the tranny pan,# 986-321-025-02, to the original ZF 5HP19 body. But ZF recommends that low torque value. I suppose that the oil pan is from ZF, isn't it?
Is 80Nm way too much for purpose of no leakage even considering the large fill plug size M30-1.5mm?
Furthermore, it will be lubricated torque with ATF inevitable there meaning actual torque of ~1/4 or 1/3 more than the 80Nm!

Is there any reason to follow that scary torque value?
Enlighten me. Thanks.
----------
CK



Last edited by bachmoza; 04-06-2017 at 08:52 PM. Reason: miss typing
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