flood - Volvo Penta
Following your suggestions I stripped, flushed refitted the heat exchanger and rubber boots. Next time out the problem recurred. I called out a mechanic
on Sunday, who diagnosed failure of the heat exchanger. I got home with a plastic hose taking the water from the radiator filler overflow overboard
Stripped out the heat exchanger, fitted the rubber boots with a wine cork in the downstream outlet, and tested (at lung pressure) under water. Heat exchanger OK, tiny leak in the downstream rubber boot, damaged by the jubilee clip. Not the main problem.
At the Volvo agent, buying
a new boot, a young engineer
overheard my comments and suggested that I should look at the exhaust elbow, where the raw water
drops into the exhaust. Sure enough this was blocked with soot, calcium and rust, causing enough back pressure to unseat the boot from the heat exchanger sending raw water
into the 'closed' cooling
I note from other threads on this forum that there are stainless exhaust elbows available to eliminate this problem.
Martin is my name and Tipsea Again is my boat.