My 1987 Universal MK 12 engine runs fine, and the heat exchanger appears to be doing its job. Recently, however, I decided to change the zinc in the exchanger. I do not know when it was last changed. When I took it out, there was no zinc left, only the threaded part. When I tried to replace it with a new zinc, there was an obstruction and the zinc would not go in.
I am assuming the obstruction is a corrosion layer that has covered the hole and is not an integral baffle or other part of the exchanger. I was considering trying to drill through it until it will accept a zinc. Does that sound like a reasonable approach, or a really dumb idea? I don't want to ruin the exchanger, but, without correcting this, sooner or later I will have to replace it.
I am assuming the obstruction is a corrosion layer that has covered the hole and is not an integral baffle or other part of the exchanger. I was considering trying to drill through it until it will accept a zinc. Does that sound like a reasonable approach, or a really dumb idea? I don't want to ruin the exchanger, but, without correcting this, sooner or later I will have to replace it.