Thrust Washers SOLVED. Thanks to RichieVR who has found the solution. The engine was built with 4 washers 2 marked 021635 & 2 marked 021637 this has now been replaced with just 2 021105635B this has been confirmed by the factory 23/08/00†Now you replace the set of 4 washers with a set of 2 new washers. Thanks to everyone who tried to help, well done Richie. Best regards JJ