225 HP 1994 Johnson Water Deflectors

[Captn Dave]

Do the 1994 225 HP Johnson's have water deflectors installed in the cooling passages in the block?

 

[Dhadley]

Re: 225 HP 1994 Johnson Water Deflectors

They are plastic water restrictor pins, not the rubber deflectors you might be thinking of.

 

[Captn Dave]

Re: 225 HP 1994 Johnson Water Deflectors

Thank you Dhadley.

Are these pins installed internally?

 

[Cricket Too]

Re: 225 HP 1994 Johnson Water Deflectors

Are these pins what was used by OMC after a certain year, in place of delfectors? Do they need to be replaced occasionally like delfectors do?

 

[Faztbullet]

Re: 225 HP 1994 Johnson Water Deflectors

I suggest having the water mods done to block like the 99 and up ficht blocks . I have all my customers blocks done. You will pick up about 5psi in water pressure and improve cooling big time.(These mod's only for closed deck blocks)

 

[Dhadley]

Re: 225 HP 1994 Johnson Water Deflectors

Second on having the mods for sure!

 

[Captn Dave]

Re: 225 HP 1994 Johnson Water Deflectors

What is involved in installing the water mods?

 

[Faztbullet]

Re: 225 HP 1994 Johnson Water Deflectors

Here are pictures of my spare block. All the factory deflectors are removed and new ones installed along with enlarging water passages.This eleminates hot spots and even temps out on block. Heat kills loopers as the locating pins migrate out of pistons and rings turn and hang in ports.

 

[seahorse5]

Re: 225 HP 1994 Johnson Water Deflectors

Here are pictures of my spare block. All the factory deflectors are removed and new ones installed along with enlarging water passages.This eleminates hot spots and even temps out on block. Heat kills loopers as the locating pins migrate out of pistons and rings turn and hang in ports.

When the deflectors are removed, how much are the water passages enlarged? Are they just drilled bigger or ground out with a die grinder.

What size is the blow off hole drilled out to by the rectifier passage in the top of the block?

Thanks

 

[daselbee]

Re: 225 HP 1994 Johnson Water Deflectors

OK gentlemen...
This is VERY interesting to me. I would like to do this mod on a used '98 225 powerhead before I install it. It is being replaced due to a burned up #1 piston on the previous powerhead.
What are the EXACT instructions? Can it be done while the motor is assembled, or does it have to be done when torn down for rebuild? You say replace the water deflectors....but are you using the exact same ones, or are they different in design?

PLEASE...some more info on this will be very welcome.

 

[Faztbullet]

Re: 225 HP 1994 Johnson Water Deflectors

Alright fellows here is link to companny that does my mod's. I highly suggest it be done. If you call them tell em Alan told you to call, ask for Larry
http://www.mar-fab.com/MarFab_Tech_Bulletins_D9579.pdf