Volvo Penta 5.7 Gxi-h Service Manual -

Platinum-tipped for longevity, with a recommended gap of 0.060 inches .

A service manual is a guide. Working on marine engines involves fuel vapors, high-voltage ignition systems (50,000+ volts), and exhaust gases. Always disconnect the battery before working on the starter or alternator. If a procedure involves the fuel rail, the manual requires you to relieve fuel pressure using the Schrader valve (covering it with a rag to prevent spray). Never assume you remember the torque for head bolts – look it up every time. volvo penta 5.7 gxi-h service manual