Pistons- Life Expectancy??

Sean_irl · 01-22-2004, 03:03 AM

Hi All....this is my first post on this side of the forum. Following my launched valve, blown cylinder head, damaged barrel & piston, damaged right camshaft and bent conrod...I have decided that a top end rebuild is in order.

The engine is a 1971 2.2S and was last rebuilt in the UK in 1990 at around the 100k miles mark. It isnow around the 140K mark...but the car was sitting idle for 10 years.

All the pistons were cleaned in an acid tank during the rebuild in 1990. But i'm now wondering whether I should get a new set of Barrels & Pistons. Is this necessary as the ones in it are over 30 years old and 140K plus miles on them.

I don't particularly want to fork out the cash on a set...but i'd rather bite the bullet now and do whats right for the engine...rather that this come back at me in later years.

Thanks,
Sean

Signal Orange 1971 911 2.2S - Undergoing Engine Rebuild

Sean_irl · 01-22-2004, 03:26 AM

I've just been off the phone and got advice to check the gaps between a piston ring and the cylinder and also the distance of the rings while on the pistons.

Sean

Signal Orange 1971 911 2.2S - Undergoing Engine Rebuild

Rot 911 · 01-22-2004, 06:01 AM

Sean, you really should buy Wayne's rebuild book. It gives all the tolerance specs for the pistons and all the other internal parts.

Sean_irl · 01-23-2004, 02:17 AM

Hi Kurt...looks like I have sinned here by posting a question where the answer is in the rebuild book. I have both of waynes books and have been sumerged in the rebuild book for many weeks now.

The phrase 'can't see the trees for the wood' (or something like that) comes to mind. Time to searc and read again.

Wayne 962 · Wayne 962's Garage

Yup - just measure them to see if they are still in spec...

-Wayne

Rot 911 · 01-23-2004, 04:55 AM

Quote:

Originally posted by Sean_irl
Hi Kurt...looks like I have sinned here by posting a question where the answer is in the rebuild book. I have both of waynes books and have been sumerged in the rebuild book for many weeks now.

Sean, no sin comitted! I just wanted to make sure you had the rebuild manual before proceeding. Everyone here just wants to make sure you have a successful rebuild.