617 589 05 23 00 Plug gauge - WS05.00-P-0130C

FG 05/Set C 

ENGINE 615, 616, 617.91 /93 /95 

Use/specification: 

10 mm Plug gauge for monitoring valve guide

Fig 1: Monitoring Valve Guide Using Plug Gauge

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Plug Gauge (617 589 05 23 00)

Courtesy of MERCEDES-BENZ USA