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I have a pair of QSB 380 motors with 11,000 hours on them. We service them EVERY 100 hrs. using Fleetguard fislters and Delo 400 15-40 oil. EVERY season the heat exchangers and after-coolers are removed and service on the bench per Tony’s protocol.
This winter I removed the Airsep air filters, plugged the lines and ran a hose from the vent on top of the valve cover to a vented gallon bottle. All was well and the motors seemed to run great with less soot on our transom. Now I have discovered that after 100 hrs the vented gallon discard bottle on the starboard motor is about half full of crankcase puke while the port motor only has about 2 inches.
My feeling was that these motors were mid life and would preform for another 6 to 10,000. Now I’m wondering if a half gallon of puke in 100 hrs is a sign that the end is near? These are the first electronic motors I have ever owned. They don’t act tired or smoke. How can I get an idea of how much life is left?
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