Winterizing tip to prevent cracked blocks

[Bt Doctur]

This only applies to those equipped with single point drain systems. This is the 3rd boat that I have found the block drains "blocked" with scale.
You MUST remove the quick connect hose and probe the engine block drain holes .
Failure to do this critical stem will most likely result in a cracked block. This also applies to those who have a flushing attachment hooked to the block drains and manifolds. You need to remove the flush hoses to make sure the connections are not blocked by scale.
In fact, it may be to your advantage to completely remove this system and install brass drain plugs.

 

[Bondo]

In fact, it may be to your advantage to completely remove this system and install brass drain plugs.

Ayuh,.... Agreed,.... All of those Quick Drain Systems are a cracked block, just waitin' to happen,......

 

[Mule Laker]

Right. I've heard of these getting clogged up before. So if these lines are both clear then in theory this drainage system works just fine. Correct?

 

[Bt Doctur]

when the lines and OPENINGS THE BLOCK are clean the system works as designed.

 

[Lou C]

If the boat was used in brackish or salt water those systems should be completely taken off and brass drain plugs installed. There will always be rust flakes in the engine and manifolds and they will clog the holes and those drain holes. The fact of the matter is that ALL inboards should be closed cooled at least for the engine itself. That's how they were designed and all this one point drain/air pressure drain is just a cheap way out of setting up the engine the right way.