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Discussion Starter · #1 ·
Good day folks. Quick question.
1991 Onan Performer 20XSL

while reading manuals in various procedures they refer to doing it in accordance with Spec A or sometimes Spec B.
then will describe it another way using Spec C.

is this various year changes? And how would I know what these Spec’s are?
I’ve included a pic showing the three specs I’ve run into so far.
thanks for the help
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On the Onan engines, the spec is a derivative of the engine type code ... e.g. the 4020's used a type code 10904C engine ... that is spec C.

While these may correlate through time, they are more closely correlated to build specifications for that specific engine number.

Brian
 

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Discussion Starter · #3 ·
Thanks Brian.
Would that be like the model number I found in my manual. P220G-I / 10904C.
Do I look for spec G. and C?
 
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