A shameless but well deserved plug....

[Tbone425]

So I wanted to say that anyone thinking about picking up the engine rebuild book NEEDS to. I am about 2 weeks into owning a complete car in a million pieces I purchased from a barn in the middle of nowhere. The engine was disassembled and stored well. I now have all of the engine laid out on my bench. Knowing why the engine had been opened helped... But knowing what I as looking at/for was an even greater help. I cannot speak highly enough about the level of detail. Coupled with 100's of years combined knowledge available here, I think this a a very realistic project for anyone comfortable turning a wrench.

This being said. I did have a couple questions that I might find answers to here. I found It has the cylinders that are desirable for the ability to be reused in some cases. I have one that has two of he cooling flanges chipped off and another cracked, is this something that can potentially be repaired?

Also, the reason for this 2.7 being torn down is that it started making chain noise, was shut down with seconds. It did not throw the chain but sheared a half dozen teeth off. Should these be replaced as a set even if only a single side was effected?

Thanks to everyone in this great community for helping get me pointed down the tracks.

[kach22i]

Originally Posted by Tbone425

Should these be replaced as a set even if only a single side was effected?.

I have no idea, just giving you a bump.

Two sprockets/toothed gears...............the chain and both gears experienced the same incident. It seems to me that everything in the loop was stressed and should be replaced as a precaution. However like I said that's just my best guess. Hopefuly others will chime in.

Below is a tech article which may or may not provide more insight on the matter.

911 Carrera Chain
Tensioner Installation

[tharbert]

It's really hard to say about the fins. If you have aluminum, no. You'll probably never get a decent weld. If iron, attitudes vary. Basically, a broken fin middle or lower on the cylinder is probably OK for a non-track car. Up towards the head would be worse because that's the hottest area. To answer, yes, iron fins can be welded back into place....by the right welder. Link


If there was a suspected time jump, I'd look very closely at the timing gears and intermediate shaft gears. Also look at the rockers. They are supposed to break when pistons touch valves saving the valve train but what normally happens is that gear teeth break, valves bend and rockers break. Also, measure the chain lengths. If the original sprockets appear to worn from mileage, I wouldn't just replace a single gear and chain. Then again, I wouldn't look to change them for no good reason. You're just going to have to measure and decide as you will end up doing as you go through the rest of the motor.

What about the heads? Are any valves not seating.

Pics would be cool!