[MPDano]

Ok, found this in an earlier thread:

The Euro in 80 to 83 had two flavors, plain and S, from 84 to 86 only S. My 85 Euro S had a timing belt fail and valve damage, your 84 shouldn't be any different. The Euro non S were pretty much the same as the US and non interference.

Safest way to discuss anything specific on a 928 is to talk about the VIN, other bits can be confusing related to model year.

Checking the TB is actually checking everything "related" to the TB, the TB itself rarely fails on its own, the water pump seizes or a guide is damaged. Maybe 20 minutes to look around, take the covers off etc. Nasty noises though need immediate attention.

If the TB skips a few teeth you should still be OK, the valves do have a LOT of clearance, just not 100% of a rotation.

Non interference update.

Subject was recently thrashed around again on rennlist with more detail surfacing. Generally only the Euro S 16v motors have a risk of valve to piston contact. Early Euro S motors were 10.0:1 compression, with deeper valve reliefs and should have no risk unless carbon has built up in the pockets. The switch to 10.4:1 pistons occurred after the start of the 84 model year, and these have shallow valve reliefs, good enough for slipping a few teeth or installing a belt, but damage assured if the belt breaks.

Cut off for use of the older pistons is by motor serial number;
0597 for manual cars
6114 for automatics

Thread on rennlist I pulled this info from.
http://forums.rennlist.com/rennforum...d.php?t=431524