http://cptdb.ca/wiki/index.php?title=Kingston_Transit_8382
When I entered that VIN for this 1983 Orion I, as typed (2B1129573D5509770), the VIN Decoder website says the check digit is incorrect.
Therefore, I must now submit to you whether or not which of these two VINs is actually the correct one. Is it either 2B1129273D5509770, or 2B1129579D5509770?
As the 6V53 was not used in the Orion I after 1982 save for the last OC Transpo 30-foot models (8371 to 8392), then I can only guess at whether or not Kingston's 8382 had the 6V53 (according to the typed VIN there) or if it had the 6V71N like many '83 Orions did.
The engine code, which is the 7th digit in the VIN, would mean:
2 = Detroit Diesel 6V71N
5 = Detroit Diesel 6V53N (C40 injectors)
~Ben