Boomyal
Supreme Mariner
- Joined
- Aug 16, 2003
- Messages
- 12,072
I just removed the risors on my '76 888. From all appearances they were original. I had one exhaust boot/sleeve that sprung a leak whilst I was winterizing the boat last fall. Ultimately, even the other one showed numerous cracks on the inside of the boot.
To remove the risors, I had to custom grind a 1/2" wide cold chisel to create a much more gradual ramp. With much effort, the risors finally popped off the manifolds. Here is the glue deal.
I soaked the metal gasket plate in lacquer thinner in hopes of making the gasket residue scrape off easier. No go. I soaked, I scraped, I soaked, I scraped. Finally after a half dozen cycles I was able to get the plate cleaned of the gasket.
Now onto the risor surface. I used a gasket scraper. Was able to get off some gasket material but not down to the metal. I got out a razor tool. I cut and I cut and I cut. Finally I got out a long block with 80 grit paper. I was finally able to start seeing bare metal, but still not clean. Finally I got out my little 3 x 3 Makita orbital sander, with 60 grit paper on it and was able to finish cleaning the surface of gasket residue. Once I finished with that, I got a big flat file and carefully finished it off.
My goodness, what kind of gaskets were those and what kind of adhesive was used? If lacquer thinner and all those scraping, cutting and sanding tools took that much effort to clean it off, that was some bold stuff.:|
I guess Merc did not want water to cross over to the exhaust passage.
To remove the risors, I had to custom grind a 1/2" wide cold chisel to create a much more gradual ramp. With much effort, the risors finally popped off the manifolds. Here is the glue deal.
I soaked the metal gasket plate in lacquer thinner in hopes of making the gasket residue scrape off easier. No go. I soaked, I scraped, I soaked, I scraped. Finally after a half dozen cycles I was able to get the plate cleaned of the gasket.
Now onto the risor surface. I used a gasket scraper. Was able to get off some gasket material but not down to the metal. I got out a razor tool. I cut and I cut and I cut. Finally I got out a long block with 80 grit paper. I was finally able to start seeing bare metal, but still not clean. Finally I got out my little 3 x 3 Makita orbital sander, with 60 grit paper on it and was able to finish cleaning the surface of gasket residue. Once I finished with that, I got a big flat file and carefully finished it off.
My goodness, what kind of gaskets were those and what kind of adhesive was used? If lacquer thinner and all those scraping, cutting and sanding tools took that much effort to clean it off, that was some bold stuff.:|
I guess Merc did not want water to cross over to the exhaust passage.
