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Suzuki df350 thermostat flush

Old 01-11-2020, 04:43 PM
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Default Suzuki df350 thermostat flush

I’m trying to figure out how to “flush” out dirt from my water system at thermostat. Engine is on a shallow sport x3 and I constantly run shallow. I get debris clogging the pick ups. I’ve tried to do the normal back flush through pee hole, run leader through hole etc. in my Verado 350 I could remove thermostat and put a rag around a hose and flush system out. I can’t even find the damn thermostat on the new Suzuki. Anybody know these new motors and know where the thermostat is located.? Manual is worthless.
Old 01-11-2020, 05:42 PM
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The Suzuki 350's have 2 thermostats and you will likely have to remove the thermostat covers to get to them as back flushing the newer four strokes is no longer an option. Here is a diagram showing the the 2 thermostats, & maybe a dealer can chime in and tell you more https://www.brownspoint.com/store/pc...l.asp?ID=19002
Old 01-11-2020, 05:50 PM
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I just changed mine. You have to remove the plastic fly wheel cover, then stbd thermostat cap comes off with two bolts. Port side need to take the three bolts off at the block in order to get the thermostat cover off. You will likely need a gasket for the port housing. I think it was 10mm for all or most bolts. Pretty simple but crazy you can’t access port thermostat directly without removing the housing.
Old 01-11-2020, 05:55 PM
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Just remembered I snapped a photo.

See the housings just aft of flywheel at center of engine. The caps covering the thermostat are facing AFT and the port is under the stbd housing.
Old 01-11-2020, 06:27 PM
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The thermostats are the two tubes hold with 3 bolts in the middle of the engine (at least on the DF300)
there should be a rubber hose going down on the thicker end and there are the thermostates.
You must probably undo the 3 bolts and the rubber hose to pull out the thermostates, difficult to say from this pic.
The thermostat covers are held by 2 bolts on the thicker end, if you can undo them without pulling the whole tube would be more easy, but not sure if that works.
Put a rag in the hole below the thermostats to avoid that some bolt, thermostat or dirt fall down and then you will have "fun" to try to pull them out.
Chris
Old 01-12-2020, 04:45 AM
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thanks. Got it
Old 01-12-2020, 07:12 AM
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JFYI that pic of a DF350 above looks almost identical to the V6 250 and 300, so it's a general design that they've been using for 15+ years.
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