I've been steadily dismantling the cooling
system on the old 4-108. I bought this boat as an estate sale
, and have been refurbing it.
Like everyone else my 4-108 overheats. It is now clear why.
The heat exchanger
is almost completely clogged, although receipts showed that only a few years ago the PO had it removed and cleaned by a radiator shop. That's why I didn't check it first.
After several dosings of muriatic acid and reaming out all but one of the tubes was clear.
I had to remove the coolant
reservoir to get at the thermostat. (I would happliy flog whoever designed this...) It took a long time but I finally got it free. What a mess - the thermostat was gunked up!
In fact the whole coolant
system plumping has a thick slime coating, with a waxy buildup in places, as can be seen on the thermostat, and on the hoses in/out of the manifold cooling
I took the reservoir home and opened it up and cleaned it out:
After a week I was ready to reassemble the reservoir, and paint
it and the two metal pipes I brought home from the engine
Now, if I can figure out how to finish rebuilding the water
pump (separate thread) I can begin putting it all back together - after I have cleaned out the rest of the system. Suggestions?
In any other engine
I'd leave the thermostat out, run water and cleaning
solution (which?) through it a couple of times before final rinse. Then install the thermostat and add coolant. But with this engine (grrr...) I don't want to take the reservoir off again so I'm going to have to have the thermostat in place from the start. I hate the thought of all that slime going through the heat exchanger
and the thermostat. Any ideas on how to clean the engine plumbing