Nyloc nutzzzzzz

[Gogar]

As I put my engine back together, I find myself looking at a lot of pictures of pretty, clean, fancy engines. Especially in Wayne's rebuild book, I notice a lot of Nyloc nuts in places where there are NOT nylocs on my engine. On the throttle relay plate, on intake runners, etc. Not really crazy critical places, but places where there weren't nylocs on my engine.

Do You ever use Nylocs in places where it's not specifically called for, and why? Because there's less of a chance of vibration/loosening, or what?

Is there some kind of unwritten rulebook about when to use/not use nyloc nuts?

TIA!

[TimT]

Kohai, try to snatch pebble from my hand

In most cases where you see the nylocs... there is the possibility that fluid..oil is being contained....i.e. the cam tower and chain housings.

When the engine is operating... those locations are perfect storms of oil.. the nylocs help keep the oil inside where it belongs.

Then there are the other cases where the extra level of sealing isn't needed like intake runners, and the stand off for the throttle relay..

[TimT]

lol did you just make this a poll while I was typing my zen answer?

[Gogar]

No, don't think so!

So, perhaps I should just keep thinking of it as a 'sealing' kind of thing instead of a 'stop the vibrationary loosening of nutzzz' thing, eh?

[TimT]

So, perhaps I should just keep thinking of it as a 'sealing' kind of thing instead of a 'stop the vibrationary loosening of nutzzz' thing, eh?

Si amigo,

In addition to the nylocs there is usually a soft washer..... soft crush washer+ nyloc when re-assembling the chain housing/valve covers = no leak...

The top of the engine... is put together with wavey washers and regular or undersized nuts

[Gogar]

Oh yeah, valve and chain covers is a given. It's the other - um - areas that I was worrying about.

Thanks!

[cgarr]

Safety wire everything! Use two spools! IF you use a nyloc on a stud (which is about everything) what keeps the stud in??? Huh?

[Gogar]

NOT driving the car is the ultimate safety measure. Huh? Huh?

[JFairman]

maybe they just like the way they look and have a bunch left over from valve cover gasket kits.

[Gogar]

Originally Posted by JFairman

maybe they just like the way they look and have a bunch left over from valve cover gasket kits.

True, it's all 8s.

[Pazuzu]

If I think of it tomorrow, I'll toss you a link to a source for a "big old box o' nylocks". It's a p-car parts source, and they sell several "big old boxes" of things like that.

[RWebb]

old?

nyloc nuts are supposed to be 1 time use only

[surflvr911sc]

Nylocs for oil sealing, lol, now I've seen it all.

[bkreigsr]

anyone else using 'jet' nuts to cure their fastener woes? ...very expensive, also one-time-only use, but hightly effective.

Bill K

[sc_rufctr]

Nyloc nuts are nice to have but they are a bit thicker than plain nuts...

Because they are thicker than stock nuts you'll find that in some cases the nylon part of the nut won't fully contact the end of the stud. I used Locktite to make sure they wouldn't come loose... Kinda defeats the purpose of having them.

It seems that Porsche were very precise about the length of each stud in the engine.
Why am I not surprised about that...

[Pazuzu]

Originally Posted by RWebb

old?

nyloc nuts are supposed to be 1 time use only

Not "old". "Big old". As in, big old honking collection of pieces parts.

http://www.eagleday.com/faas.html

$300 will get you enough random high grade hardware to rebuild any p-car.

[304065]

Originally Posted by bkreigsr

anyone else using 'jet' nuts to cure their fastener woes? ...very expensive, also one-time-only use, but hightly effective.

Bill K

How would you torque a deformed-thread nut? The Factory's torque specs are all designed to approximate elongation of the stud for proper preload. The nylocs on the valve covers, well the torque is so low because you are compressing a gasket and the gasket holds the valve cover in preload.

You put a jet nut on and torque it, you probably don't have proper preload in the stud because of all the friction on the threads. The "jet" guys use a micrometer to measure elongation of the fastener.

I don't have a single nylock in my entire engine, but that's because it is a 1966 before the DIN spec came out for nylocks. But that is a very special case indeed.

[rfn026]

First - They look cool

Secondly - You should only use them a couple of times according to Carroll Smith.

Richard Newton
Porsche Race Car File

[bkreigsr]

John Cramer:
Sorry you feel that way.
I use the jet nuts on my floating rotors using a torque value calculated my my son the ME.
I could forward you the calculation if you wish.
The beauty of he jets is, that it takes more torque to remove them than was used to tighten them.
Bill K

[RWebb]

I recently found a deformed-thread nut on the F. susp. of my car, a '73 but with many 1984 & up susp. parts on it. I suspect P AG used them in certain areas at some time or other.