How to winterize engine that won't turn over.

[JetBoat1A]

Freezing temperatures will be here soon and I want to avoid further problems in a non-running engine.

I have a 2001 Challenger with dual 717/720 engines one of which will not start and appears to be seized. It stopped suddenly while boating and I am unable to turn the
power take off shaft by hand with the spark plugs removed suggesting that engine is seized.

Normal procedure calls for pumping biodegradable RV antifreeze into the flush port while the engine is running But again this engine will not run and I want to avoid further damage. I do not have time to pull this engine out for repair or replacement until next spring.

How do I put antifreeze in non-running engine without flowing to parts of the engine where it shouldn't be?

 

[ronmold]

I never yet have had mine running when adding anti-freeze.

 

[riffe723]

The manual even says the process doesn’t require the engine to be running

 

[Chester]

Remove the hose from the head and pour antifreeze into the engine with a funnel and a short hose. 8oz is all you need.

Chester