356 crankshaft stress cracked ???

[brianvb]

My 65 356c cab was in hurricane sandy. We're doing the engine and the builder says my crank has 2 stress cracks. Should I replace it ? Does anyone have one for sale ?

[Alan Hall]

Absolutely replace it if it is cracked.....did the builder magnaflux it?

[304678]

Originally Posted by Alan Hall

Absolutely replace it if it is cracked.....did the builder magnaflux it?

+1

There are enough examples of broken cranks. I had one break in a B engine and one that I had bought at a swap meet appeared to be cracked (both on the first rod journal. If I am correct is that the common spot to crack and eventually break).

Richard

[356C&e36]

I have a Porsche 356SC 912 Counterbalanced Crankshaft 20 under mainbearings, 30 under rod bearings for sale that I will sell for $300. It fill fit 356C as well.

[James Wallace]

Hi Brian,

Stress cracks lead to this, replace your crank with the best one you can find. I have an SC crank that needs pins, and it should be good to go, I would be willing to sell it- I believe it's a STD/STD. Please PM me if you'd like more information on it. Enjoy your evening.

These pictures are from a motor that still ran, but would not idle worth a darn, it never got to the point of total catastrophe!

James

[Peter Graham]

Sorry for being so late to the party...

Even if you can find a used German crankshaft, you really can't tell how much it has been stressed even if its not showing stress cracks. There are aftermarket options that are available: both Scat and AA sell chrome-moly lightweight cranks for $2250 and $1200, respectively. AA also offers a billet crank at around $1800.

I have had a broken crank happen in my 912 and even with a replacement German crank and ~40,00 miles, I opted for a new crank. Be aware that these cranks are being forged in China with finish machining being done stateside. I understand that AA quality is very good at this point. It may sound like a lot of money to spend, but it buys peace of mind...

Peter

[jittsl]

I have a brand new / never used AA chrome-moly lightweight crank that I purchased with the intent of installing it in my 912 but did not need. I will sell it to you for $900 if you want it. Let me know

Laurence 617 642 6324