Cam Housing Hex Nuts - And Other Engine Locations

[goldgunner]

Most likely a too simple question with probably obvious answers, but here goes.

For 1980 911SC, PET shows Porsche P/N N 011.008.13 as the part number for M8 Hex Nuts used in a multitude of locations, including Cam housings (103-05), and generally all over the engine and chassis.

However, Pelican shows this p/n as NLA, with no supersession - How can that be?

So, is there a superseding p/n?
A standard p/n that Porsche uses?

Is this a standard hex nut or a nylon insert lock nut?

[Britwrench]

900 076 025 02 is the number we use at the moment.

Pelican keep them in stock.

[NevenM]

Hi

Its a std high tensile 8mm nut, Nylocks are not used where oil is around, you can buy them from Wurth

HTH

[JasonAndreas]

Nylocks should not be used anywhere on the engine, the plastic will melt. Instead use all metal yellow zinc coated locking nuts (DIN 980). I pay $8.95 for 100. The regular yellow zinc hex nuts are DIN 934, for those (M6 x 1.0mm) I pay $3.95 per 100. Metric & Multistandard Components Corporation can deliver most fasteners next day. If MCC doesn't have what you need you can try Spaenaur. They sell everything and a little cheaper but their minimum order quantities are 10x. You should order their free catalog, it is HUGE and a great reference source.

[Britwrench]

Porsche did and continues to use nylocs on engines. You can use metaloc and Porsche does, but the nylocs don't (and didn't) melt and are used through the motor industry.
I've even seen some of the aftermarket exhaust makers supply nylocs for assembly use..not on the manifold, of course.

[JasonAndreas]

When I get it wrong I really get it wrong. I'm surprised Porsche used Nyloks on the pre-3.6 engines, they will fail at around 120C/250F which doesn't leave any room if you have problems. If you look at OEM specifications for underhood plastics and fasteners the minimum temperature requirements all usually start at 176C/348F.

I'm not at all surprised to find them on aftermarket exhaust pipes. There is so little engineering in the aftermarket parts business its scary.

[Britwrench]

Porsche use nylocs on 3.6 engines too, so do many manufacturers.
I've yet to see melted ones on engines, whether street or race, unless installed on the exhaust.
Metalocs are more temperature resistant. And probably cheaper to manufacture. Which probably explains why 996 engines are bolted together..barely any nylocs or metalocs either.

[JasonAndreas]

Originally posted by Britwrench
Porsche use nylocs on 3.6 engines too

Where are they used on a 3.6? On the pre-3.6 engines the only place I could find them was on the camchain and valve covers. Both those covers on the 3.6 were upgraded and the fasteners changed to all metal lock nuts and regular hex nuts.

[Britwrench]

On pre-3.6 engines nylocs were used on crankcase halves, timing chain covers, valve covers, oil thermostat, timing cover to case (the outer nuts) and other odd bits. Later 3.2 engines went to metaloc for case halves.
On 964 3.6 engines some had nyloc valve cover nuts, some had metaloc and some had plain. (the valve cover seal kits we gat now are plain nuts..I thinkpart of that was the metaloc nuts tended to damage threads) 993s use bolts.
Again, reducing production costs meant bolts only are now used on most parts.

At the end of the day, it's up to you what to use, the nylocs work, the metalocs work, the plain nuts work (in the right location).