To Rebuild or Replace: Step One
 

Greetings: I have owned a 74 911 with an 83 Sc Engine for many years. I have substantially improved the body and exterior and intend to keep the car forever. Along the way, several technicians have stated that at some point the engine would fail. Yesterday, this day unfortunately came into fruition as when we pulled the oil plug the magnet was jammed the magnet was jammed with shavings. Prior to this, the engine was knocking pretty severely. I am prepared to spend what it takes to either rebuild the existing SC engine but would also source a 74 engine and install it.

Does anyone have any recommendations on which route to go? I truly do love this car and want to make it right.

I would caution you that the metal shavings will have been widely distributed throughout your oil lines and oil coolers. Which ever way you go with the new engine, make sure your lines and coolers are replaced or professionally ultrasonic cleaned to remove all debris.

The 74 2.7L would likely cost you more to source and overhaul than just rebuilding the 3.0L, and you'd still end up with an inferior magnesium case. But the car would be more original, if that's worth anything to you.

And yes, as Ken said, you'll need to clean everything out, otherwise the leftover debris will trash your rebuilt engine. If a front cooler has been added, those lines and thermostat will need to be cleaned out too. If it has an actual front oil cooler and not just the trombone cooler, it should be replaced, just like it says to do in the service manual.

That is great advice, gents. Thanks much. Should I have any concern whatsoever about rebuilding the existing engine? Or can most engines be saved as long as I hire the right professional?

In other words, should I be looking for a replacement engine or a rebuild of my current engine?

Properly overhauled, it will be better than new.

Rebuild the 3.0

Anyone know any reputable rebuilders in the Midwest?