Now it is confirmed that that my 3.4 is dying i've decided to do a rebuild it myself, i like a challenge!

I have a list of parts/tools i need of which most are on order but i need a little help with a few parts.

Are the head bolts and con rod bolts reuseable? - in previous engine builds i have done (EU Fords/Peugeots) they should always be replaced but i cant find any info on this.

Also, should the crank cases and cylinder heads be skimmed prior to assembly? - i dont know if the Porsche heads are already on the limits or not.

 

OMG, why is it dying?

 

scored bore on 6.

its slowly eating itself

 

Head bolts and rods bolts are not reuseable. Are you planning on using LN engineering Nikkies? Take a look on rennlist.com for Logray's threads on his rebuild. It is a great resource.

 

Heads & crank cases should be checked for flatness & resurfaced as needed. Heads should be pressure tested for cracks.
Rod bolts should be replaced with ARP bolts.

 

Does anyone know if the crank cases come as a matched pair? - i have managed to find a good used crank case cyl 4-6 but before i purcahse i need to know if i can bolt up to my existing cyl 1-3 half? -obviously after a clean and check for flatness/resurface.

i cant find any info on this. I wouldnt usually go down this route but time is if the essence to get this repaired and i cant wait 3-4 weeks for the machine work in the UK for a new liner.

 

GL with the rebuild! Take lots of pics, and we hope it goes painlessly.

 

Crankcases, like cylinder head & cam covers are machined together to be mates for life so it's not ideal. Porsche will not sell a cam cover without the head to go with it. I don't know if Porsche sells case halves seperatly but if they do that might be a good clue of your chance of finding a good mate. There is a good chance that several of your cylinders have excessive wear so it is better to resleeve all of them. You can add displacement too!