Home › Forum › Ask A Member › 89 Johnson 9.9 cooling system obstruction › Re: 89 Johnson 9.9 cooling system obstruction
Yeah, those grommets are a design flaw that haunt most all these engines used in salt water, except for the early models!
I wish I knew why the engineers chose to design these things so the top 1/8" or so of the grommet is unsupported by the water tube….Perhaps they were trying to ensure the copper water tube did not touch the aluminum engine block reducing the possibility of dis similar metal corrosion….
The design has improved a bit over the years, but I still end up cutting about an 1/8" off the top of the grommet to reduce the possibility of having the grommets crush over.
Again, your engine has two water tube grommets…