I pulled the cover off my heat exchanger yesterday and this is what I found. I penetrated the holes with an awl that would only go in about an inch before the awl was too thick to pass further. Finding no resistance, I left well enough alone. This morning, I found a great topic about this from a thread in 2015 titled "3GM30F heat exchanger stuck!" but I find that I still have questions.
I could not extract the cylinder. I tapped lightly with a screw driver and hammer around the perimeter of the cylinder but did not want to cause any damage. I also tapped on the pin. Nothing seemed to even want to break free. That black ring that looks like a rubber O ring felt metallic to me and that also would not budge. I couldn't tell if that was supposed to come off or not. The groove around the outer perimeter looked like the location where an O-ring should be placed, but I did not have one in that size (there wasn't one there when I opened it).
The diagram that @Allan12210 helpfully posted shows a gasket & an O-ring behind the cover. I couldn't tell from looking at the pin that it is actually a separate component. It seems fused to the cylinder to me. How would you approach removing the cylinder, and would you?
I only pulled the cover off because I was curious if there were any impeller bits in there. I started out by replacing the impeller and replacing the water pump belt. Saturday, Sue and I were sailing to Atlantic City. We were halfway there in the afternoon as the wind was getting lighter and we were going to turn pretty much downwind toward AC. The going was slow and bouncy, Sue was getting seasick, and I turned on the engine to get there by 5. No water passing thru the pump. I was horrified to see how bad the belt looked because I never paid enough attention to it - belt and impeller turned out to be bad. I had spare impeller and belt on the boat but I didn't have proper tools! I only had a crescent wrench and it wasn't sufficient to loosen bolts. BRING TOOLS ONBOARD!
. We sailed back to Barnegat Inlet & got a tow from there. It was a better point of sail and it took us a little over 3 hours to get outside the inlet. I was tempted to sail thru, but tide wasn't quite slack before turning favorable and Sue was insistent that we take a tow! Replaced the belt & impeller and all is fine. The impeller had no broken bits anyway.
I could not extract the cylinder. I tapped lightly with a screw driver and hammer around the perimeter of the cylinder but did not want to cause any damage. I also tapped on the pin. Nothing seemed to even want to break free. That black ring that looks like a rubber O ring felt metallic to me and that also would not budge. I couldn't tell if that was supposed to come off or not. The groove around the outer perimeter looked like the location where an O-ring should be placed, but I did not have one in that size (there wasn't one there when I opened it).
The diagram that @Allan12210 helpfully posted shows a gasket & an O-ring behind the cover. I couldn't tell from looking at the pin that it is actually a separate component. It seems fused to the cylinder to me. How would you approach removing the cylinder, and would you?
I only pulled the cover off because I was curious if there were any impeller bits in there. I started out by replacing the impeller and replacing the water pump belt. Saturday, Sue and I were sailing to Atlantic City. We were halfway there in the afternoon as the wind was getting lighter and we were going to turn pretty much downwind toward AC. The going was slow and bouncy, Sue was getting seasick, and I turned on the engine to get there by 5. No water passing thru the pump. I was horrified to see how bad the belt looked because I never paid enough attention to it - belt and impeller turned out to be bad. I had spare impeller and belt on the boat but I didn't have proper tools! I only had a crescent wrench and it wasn't sufficient to loosen bolts. BRING TOOLS ONBOARD!
. We sailed back to Barnegat Inlet & got a tow from there. It was a better point of sail and it took us a little over 3 hours to get outside the inlet. I was tempted to sail thru, but tide wasn't quite slack before turning favorable and Sue was insistent that we take a tow! Replaced the belt & impeller and all is fine. The impeller had no broken bits anyway.
