Size of distributor shaft o-ring? 1982 308

They do leak a lot. Just keep trying until one does not leak.

 

Are you talking about the cam extension that holds the rotor? On an 82 there is no distributor shaft so there is no distributor shaft O ring.

Do you have a Ferrari part number?

 

+1 -- or an engine transplant, or a late carb 308 that came from somewhere else and got a "1982" year assigned in the documentation, or something else? Will be an interesting story no matter what .

 

Do you have a carbed 308 or a 308i-2V or a 308QV? Any of those could possibly be a "1982" in their documentation.

The "coupling", item 33 here: https://www.ferrariparts.co.uk/diagram/ferrari/308-gtbi-gtsi/037-engine-ignition that goes into the cam on a 308i-2V does not show an o-ring. (And the part supercession makes no sense to me as the 117342 coupling 308QV part looks very different than 115587 coupling.)

The "coupling" for a 308QV, item 33 here: https://www.ferrariparts.co.uk/diagram/ferrari/308-quattrovalvole/037-engine-ignition does have o-ring item 8 (Ferrari PN 109478).

Can you post a photo of your engine family marking and/or your engine bay?

 

Steve, 81/82 does have an O ring. Its shown as part 49 but in the legend it is mismarked.

To Cory, 109478 crosses to 15.6 mm ID and 1.78 section diameter. I have replaced them before. I coat it all with an anerobic sealant like Locktite 518 when I assemble them. Silicone there is a bad idea.

 

Talk to Brian Keegan at T Rutlands. 800-638-1444

 

No disagreement that they mangled that "49" o-ring stuff -- but that's in the US version 308i-2V SPC. The link that I posted is the euro version 308i-2V SPC that doesn't show an o-ring at all (might have one, and they just left it out completely from the figure and parts list, or could be that they initially didn't think that they needed one and added it later). I also see, that in both of those SPCs, there are completely different intake cams depending on whether the 115587 coupling or the 117342 coupling is used -- shows IMO that they must have been in a really tough spot as not being able to use the same camshaft is something that I'm sure they would've preferred to avoid.

 

For the period 80-82 Ferrari printed 2 parts manuals. MCP and Ricambi only show one. I have both.

This is exactly why instead of looking it up and going it alone and crossing your fingers you employ the help of a real live Ferrari parts person who has been in this business as long as I have.
Its why I went to the trouble of giving you a name and number.

Or would you rather save a dollar and get more wrong parts?