I have a 1988 yamaha 90 2-cycle exhaust errosion problem on the channel walls allowing water into the cylinders. Are the aluminum walls fillable with the motor mounted on the boat? J-B Weld, Steel Putty or HST-2000 an option? Thanks Mark
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yamaha 90 block repair
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Never tried it not sure if would be able to get it to stick on stay in place.
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I am a Diesel Tech for a local dealer in North Carolina. I don’t recommend using J.B. Weld to repair a damaged block. There I got what I am supposed to say out.
Now, for the good stuff. I had a block that was pitted where the lower part of the liner meets the block. I used the famous J.B. Weld to repair the pits. I layered the product in with thin layers. I took roughly 3 layers of product. I then sanded the affected area until it was smooth and you could see the dark spots where the product was installed. I waited 24 hours before sanding. I had the pleasure of rebuilding the same engine after 250,000 miles after the repair was made. I was astonished to see that the repair held up after so many miles. I have since made similar repairs to different engines when the owners did not want to replace the block.
As long as the cracks are not very wide or very long I think that your repair will have the same success.
Good Luck!!!
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