It would be a bit of a stretch, but if the exhaust
elbow is fouled, and the seals
between the tube bank and the HE casing are deteriorated, might get some blow back into the FW cooling
system. Wouldn't take much to show up in the closed cooling
system, particularly if the water/AF are not changed regurarly. Over the years I have run radiator cleaner through mine a couple of times between changes.
As to the SS elbow, it will be interesting to see if there is any difference. Looks better on the outside at least. In the past (I do really look before I toss them), there has been considerable carbon build up along with the rust ect. On ebay the SS copy was high quality and was less than $25 more than the standard cast Yanmar
. She is still running normal temp and I have other priorities so the look see will have to wait.
For two boats with GMs, the elbow replacement, new impellor every 3 or 4 years, and 32 Cal
brush for the tubes, have kept my temperatures under control. These are great little engines. The 2GM
from my Hunter
30 (Michael left perched on my dock) is sitting in my garage. Was running fine before the storm, but i decided to do some maintenance
on it before i put it on Craigs list. Lot easier on a dolly than working in an engine box.