CyCloNe!

What in the world?! Sorry been a rough day already, had someone important to me pass away and then open my hood to find this piece broken off my engine I assume due to vibration? So new covers are going to be added to my list 😭

tempest411

I seemed to recall that piece on the 16V models are made of magnesium, and that kind of degradation happens with magnesium. Luckily, new ones are available:

Rear Camshaft Belt Cover 944S S2 968

V2Rocket

"customer reports intermittent spark"

Jay Wellwood

Unfortunately, I don't think the cover is available. Tried to purchase one a couple of weeks ago from Paragon, reportedly NLA and not expected to have them made anymore.

Please - correct me if I am in error here.

931guru

There are a couple of listings on ebay for aluminum replacements made by rennbay. Rennbay doesn't show them on their website anymore.

Tom M'Guinn

Sorry for your loss.

See here re your issue:

https://rennlist.com/forums/924-931-...he-rescue.html

CyCloNe!

Thank you... Looks like a used one will be the direction to take. Are the s2 ones magnesium as well? Any methods to keep it from corroding? Thanks guys.

odurandina

do they corrode or is that mostly fatigue?
These engines vibrating everything half to death,
for 30+ years.

Jay Wellwood

From my understanding, it's a unique issue. The magnesium is porous and absorbs the vapors in the area...then it begins to swell - as it does, it begins to break down/crumble.

jhowell371

Magnesium has caused lots of problems over time. Saw it in aircraft too. I think 944Online sells an aluminum replacement set, front and back. About $300-400 I think. YMMV

DSMblue

So if a magnesium replacement is available, would seem to be a good idea to have it powder coated prior to installation to seal the pores in the metal.

Zirconocene

Agree with @DSMblue , if you can powder or Cerakote it, you should stop any degradation due to the environment. You could probably also put on a conversion coating (using something like Sanchem) and that would help, too.

Good luck. I have some issues as well with my rear cover, but nothing like what you're showing.

Cheers

tempest411

You know, magnesium parts of any kind always have problems like this. I wonder why they even use them on non-specialty (race) applications. It can't be worth the few grams of weight saved compared to aluminum.

J1NX3D

if you know where it's listed i'm interested in having a look. I can only see genuine ones listed

front cover $232.60
https://944online.com/index.php/engi...elt-cover.html

rear cover $449.95
https://944online.com/index.php/engi...elt-cover.html

tempest411

That's the problem. The genuine ones are magnesium.