New (2022) Suzuki DF300AP overheating at idle

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inmanlanier

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Hello, we have a new Suzuki engine on our 2002 Parker 2300 DVCC and have just finished our annual trek to Cudjoe Key for a week. Just prior to going, the motor underwent the 20 hour service (valve lash check and oil change?).

Where we stay in the bay has a shoreline of water dredged to a depth of perhaps 8; we literally get on a plane from the dock and about 80 yards down the shore we peel out where the dredge area goes away from shore as much as 30 yards or so. At that point the depth is very shallow ( 1 1/2') bay water for most tide situations.

Since I generally like an engine warmed up before putting load on it, I start early while we loaded folks and gear. On two of the days the Suzuki overheated on us. I can see the temperature in my 3rd party NEMA tack digital display if I select it. The first time I noted something was going on because the idle speed picked up - I asked if anyone messed with the throttle - then a bit later the audible alarm went off and I noted 170 degrees. I powered off and restarted - no issues - my recollection is that the temp was quite a bit lower on restart. It happened another day, I powered it down and restarted, audible gone.

I know that Suzuki goes for low pressure, high volume water systems and perhaps they are more likely to low flow at idle. I know the water temp at our dock was rather tepid. Perhaps I have a flaky temperature sensor. Has anyone else experienced this issue with these motors? Thanks in advance.
 
Hello, we have a new Suzuki engine on our 2002 Parker 2300 DVCC and have just finished our annual trek to Cudjoe Key for a week. Just prior to going, the motor underwent the 20 hour service (valve lash check and oil change?).

Where we stay in the bay has a shoreline of water dredged to a depth of perhaps 8; we literally get on a plane from the dock and about 80 yards down the shore we peel out where the dredge area goes away from shore as much as 30 yards or so. At that point the depth is very shallow ( 1 1/2') bay water for most tide situations.

Since I generally like an engine warmed up before putting load on it, I start early while we loaded folks and gear. On two of the days the Suzuki overheated on us. I can see the temperature in my 3rd party NEMA tack digital display if I select it. The first time I noted something was going on because the idle speed picked up - I asked if anyone messed with the throttle - then a bit later the audible alarm went off and I noted 170 degrees. I powered off and restarted - no issues - my recollection is that the temp was quite a bit lower on restart. It happened another day, I powered it down and restarted, audible gone.

I know that Suzuki goes for low pressure, high volume water systems and perhaps they are more likely to low flow at idle. I know the water temp at our dock was rather tepid. Perhaps I have a flaky temperature sensor. Has anyone else experienced this issue with these motors? Thanks in advance.
Are you sure you weren’t pumping mud/sand/weed from the shallows?
 
Missed the response...apologies. yes - sure - clean clear water w/o debris or sand. It's 5'+ deep at the dock.

We're here again with same issue in the same location (Cudjoe Key, Fl). I noted on the 2nd experience this trip that if I bumped the idle up to 1000 RPM in neutral - the temperature then started coming down.

I think that rules out sensor setpoint (or calibration/quality). I'm thinking the water pump impeller may be the culprit. Under load we are typically reading 156 degrees. One time I noted 160.

This has not occurred in our home inland Port in WPB, FL.

Other's experience?
 
Some new 300's came from the manufacturer with faulty water pumps. See below....

Old

08-15-2023, 05:34 AM
#9
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Quote:
Originally Posted by fishy wipt
Some of the new 300 Suzuki outboards came with bad water pumps , contact your dealer to have them warrantied , if in doubt call Outboard specialties in pompano, they can validate my answer
This is correct, we have come to realize some brand new motors had faulty impellers from the factory causing idle overheats.
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