The radiator cap on my Perkins diesel engine (Perkins Perma M30, installed by 
the PO around 1982) is badly rusted.  It’s easy to find a replacement that fits 
physically, but what opening pressure rating should it have? At 2000-3000 rpm, 
the temperature gauge reads about 175 F degrees.

Eric Frank
Cat's Paw
C&C 35 Mk II
Mattapoisett, MA

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