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On a 3 cylinder motor #3 will be a tad darker due it being supplied a lil extra fuel from recirc system to bottom bearing. Same way on a V-4 as #4 and #6 on a V-6.
No......remove seal and o-ring. Place new bearing in freezer overnite. Place head on top of small coffee can. Pre-heat oven to 450° and insert. You will hear it fall out into can. Remove can and flip head over. Grab new bearing from freezer and drop in head. let cool and install new seal.
Those block dont like to be overheated as the aluminum will pull away from cylinder liner . This causes head gasket to leak compression into the cooling area, which as RPM increase the pressure will overcome the impeller flow.
Here is link to look up parts. CDI pack is NLA from Mercury.. Make sure you test everything under flywheel as Yammy style packs rarely fail
MARINER : 40 (TWIN CARB) (W/OIL INJECTION) : 6E9-150001 AND UP (E) | PerfProTech.com
