When the way you’ve always done it isn’t good enough

The highlighted engine is a DF250SS Suzuki. Suzuki, like all outboards today, are very well made, yet outside influences can sometimes have negative impacts.

Lower unit and water pump service is something we do every day. However, after service, this engine would overheat while coming off plane following a moderate to long run. The lower unit, water pump, pickup tube, grommets, thermostats, and bypass valve were all inspected, and then reinspected.

We use a gasket sealing compound where recommended, and also on mating surfaces where maintaining seal is critical. Sometimes, it turns out, the way you’ve always done it, or the way you were taught to do it, needs a bit of an upgrade.

We discovered a very slight imperfection in the metal surface under the water pump that created a tiny gap in the seal under the pump’s lower plate. An area less than a quarter-inch, where the sealant could get washed out under normal operating pressure.

Using a black engine silicone compound with greater ability to seal a less-than-perfect surface was the remedy. A big shout out to our Suzuki Technical Advisor, James Pratt.

Have a safe August!

Chris Mapp

 Coastal Bend Marine | Port O’Connor, TX
361-983-4841 | coastalbendmarine.com