Lazy man's Heat Exchanger cleaning
The main has been running a little warm under load and the heat exchanger is due for a clean.
The*HE on the Cat 3406 is very large,*a two-man lift*and buried*low in the bilge, below*engine-driven pumps and hoses. There's not enough room to get the end- caps off in place. I didn't want to drain the cooling system as it holds 105 litres*of coolant and it's not due for replacement.*
Fortunately, there*are several zinc position options so I have a Zinc on the top at one end and a plug at the bottom at the other. I drained the seawater from the plug, stuck my finger in and could feel all the calcium etc. on the end of the bundle.*Replaced the*plug and removed the zinc at the other end. With a funnel I* filled the HE with ordinary household white vinegar and left it for two weeks.
When I drained the vinegar a huge amount of "stuff" came with it and the bundle is now clean to the touch. I went for a run yesterday and the engine is running 5deg cooler.
Since this is so easy (and cheap), I'll do it every year!
-- Edited by Bendit on Thursday 26th of August 2010 04:18:23 PM