Yachting Home › Forums › All things Technical › Engines › Problems changing the impellor, and recommending the Speedseal covers › Reply To: Problems changing the impellor, and recommending the Speedseal covers
I also changed out to the Speedseal on my Yanmar 4JH4. Your description is spot on Richard and I went through the same learning process as yourself. The reason I changed out to the Speedseal is although the access to the pump is ‘Okay’ it still involves spread-eagling oneself across the top of the engine and using your head like an anglepoise lamp to see what is going on.
The only problem I had was on start up when the the whole thing leaked very badly even after additional clean up of the pump face. I did solve the problem which, I think, although not totally sure, was due to my over greasing of the teflon and brass inserts, which, due to the thickness created, may have not allowed the face of the Speedseal to fit neatly with the face of the pump. I could have used a tool to tighten up the hand screws but that would have defeated a significant advantage of the Speedseal which is the screws need only be hand tight. After four attempts I got a good seal and that was immediately after I removed some of the clear grease.
So far so good indeed. I have about five hours on the engine since fitting and no signs of a problem.