[Supras] Mystery O-ring

[berniek at technicaldevelop.com]

Hi List.

    Just getting my JDM turbo engine together to install in the '91 I 
bought to replace the '90 I've had for 15 years.  However, there is one 
O-ring which I stored with the front crankshaft stuff which I cannot 
identify the use of.  It and the replacement in the gasket kit are about 
3" in diameter and about 1/8" in cross section.  After 18 months, my 
memory must be dimming.  Any ideas would be appreciated.

    Thanks.

       BernieK