Bosch Evolution 300 Series - Surface Burner Orifices

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Surface Burner Orifices
With the surface burner removed the burner orifice can be accessed for
cleaning, replacement or for LP onversion.
The surface burner orifice can be removed using a 7mm socket wrench
or nut driver.
Orifice
Each orifice has a retaining ring to help prevent the orifice from falling
out of the nut driver as it is being lifted out of the orifice holder assembly.
Take care to ensure that the retaining ring is seated inside the nut driver
when reinstalling the orifice.
With the orifice removed the size stamp is visible. The size stamp can
be used to determine if the proper orifice size is being used for a specific
burner.
Orifice Size
Stamp
Retaining
Ring
The following chart can be used as a guide to identify the proper orifices
for the various burner sizes and styles that are currently used on the
300 and 500 series ranges. Future models may change so you should
always refer to the parts list for the specific model being serviced.
%785DWLQJ6W\OH   2YDO   
Natural Gas Orifice 1.07 1.46 1.54 1.67 1.87 1.98
LP Gas Orifice .66 .93 .89 1.02 1.09 1.18
LP Orifice Marking
Color
Pink White None Yellow Brown Silver
BTU Rating after LP
Conversion
5000 9500 8000 12000 14000 16000