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  1. #1
    Member
    Join Date
    Dec 2020
    Location
    Northern CA
    Posts
    206

    Torque Specs 300XL

    Doing a 300-hour service on my buddy's boat with twin 300XL's (SN 3B215946) We don't have a manual yet but plan to get one soon. I'm looking for the torque specs for:

    1) Alternator bolts for belt replacement (flywheel tool and belt stretch tool ordered)
    2) Thermostat bolts
    3) Spark plugs (20 ft/lbs?)

    Thanks!

    As a side note, these lower units are so much easier to re-install with the "chisel-point" style shift shaft that you can see engaging properly compared to my 150 with the splined shift shaft that engages up inside out of view. Great design!
    2015 Tracker Targa V18 150 4-Stroke 2B142247 9.9 EFI Pro Kicker 1R159535
    2001 MasterCraft Maristar 210 V-Drive, LTR 330 HP

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
    Location
    Greenville, SC (US)
    Posts
    95,253
    #2
    1) 22.1 lbs/ft
    2) 88.5 lbs/in
    3) 177 lbs/in


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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