20 hour service is primarily an INSPECTION service (UNLESS the engine has been in service for greater than 364 days).
It involves INSPECTION of all Annual Maintenance items (replacement of items if necessary only), and MANDATORY replacement of the gear lube.
http://www.bbcboards.net/mercury-3-l...x-engines.html
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
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