2 replies to this topic

[protrac231]

Hello all. I just purchased a 2001 Challenger with the 240HP Mercury M2 jet drive motor. I need to know what the proper way is to flush this engine. The boat did not come with the mercury manual, and it looks as though they are like gold. When i looked in my seadoo manual it refers me to the mercury one. If anyone has the procedure on how to do this it would be greatly appreciated.

Patrick

[WAJetboating]

Hello all. I just purchased a 2001 Challenger with the 240HP Mercury M2 jet drive motor. I need to know what the proper way is to flush this engine.

No flushing is required unless you boat in salt water. The SportJets are entirely self-draining so if you're talking about flushing for winterization (i.e. flushing with antifreeze) you don't need to do anything.

However, it's important to remember that you cannot run this engine out of water, even at idle, without the hose running. The procedure to run the SportJets on the trailer is exactly the opposite of Rotax engines:

1) Water on FIRST
2) Engine on LAST
3) Engine off FIRST
4) Water off LAST

SportJets must have water running when the engine is running. No exceptions. Unlike Rotax engines there is no risk of water backing up through the exhaust system of the SportJet and getting into the cylinders, so you can safely run water through the cooling port for any length of time whether the engine is running or not.

When on the hose, do not run the engine over idle (1100 RPM). The hose water does not reach all of the places that normally aspirated cooling water does, so it's not safe to operate the engine above idle. However, it is perfectly safe to run it at idle on the hose for extended periods, which you should do if you're flushing salt water or winterizing the engine for storage.

Hope this helps. If not, ask again with more detail so we can help.

[Kevin Leclair]

Very detailed response WA! Feel free to update the wiki, http://seadoosportbo...lushing_Mercury, with your comments if you would like. This information will come in handy for many others in the future.