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Poppet Valve 2106 Verado 350’s

Old 03-12-2019, 01:08 PM
  #21  
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I have the same issue with a 2005 Verado I have been running for 7 years. Only in cold water. I replaced the thermostat and the poppet just like all the posts above and didn't fix. Old big block Chevy water pumps for marine use had a bypass hose around the thermostat to get the thermostat sensor to see the motor temp and open which is similar to drilling the thermostat. Drilling the thermostat on the verado is a good fix although too big a hole and you negate the flow control of the tstat so start small.

My motor temp does not fluctuate all the time in cold water and does not alarm at all so not as big a deal. Like a post above when it happens I just go faster but don't have too cold for too long in Louisiana so I don't worry about it too much.

Poppet valve is not for water temp control. The poppet is for water pressure control. If your boat goes 85 mph the water pressure pushing into the water intake is close to 100 psig. The poppet relieves the water pressure so gaskets don't push out, etc. See poppets all the time on big HP I/O go-fast motors.
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Old 03-13-2019, 03:11 AM
  #22  
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Originally Posted by Darkarcher View Post
I am having the same issue. I thought I got trash in the cooling system but I took it to the shop and that was not the case.

It was throwing error code of 206 according to the tech. He said the pressure was low so they replaced water pumps on both engines. This was August 2018. I ran the boat several times with no issues through October. I just put her in the water this past weekend for first run and same issue. Starboard engine threw up a fault at ¾ throttle temp jumped to 217. When I backed down it immediately dropped to 143. The port engine was not behaving exactly like that but was still fluctuating more than expected.

I pulled her out and went directly to Leisure Marine in D’Iberville. This was last Saturday.

What if anything should I tell them to help with their diagnosis. I really don’t like giving advice to folks where I am no expert. But I am not sure if they are aware this may not be an isolated issue. Has anyone gotten direction from other Mercury authorized techs?

suggestions?

thanks
Have them contact Mercury tech service and they’ll provide instructions on drilling the thermostat with a 1/8” bypass hole.
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Old 03-15-2019, 06:31 PM
  #23  
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I wonder if that is warrant covered

if if not I could have done that.

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Old 04-02-2019, 12:29 PM
  #24  
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Thanks for all the feedback... I’m still a couple of weeks away from launching mine... the water on the Chesapeake is still pretty cold and will be for a while, so it will be a good trial run...
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Old 05-20-2019, 08:03 AM
  #25  
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Following up on this thread and oscillating issue i’ve had with my Starboard engine... So we’ve replaced Poppet, water pumps, and did the Mercury recommended hole in the thermostat. The water temp for the Chesapeake Bay is 71degrees. We still get extreme oscillation on the starboard from 150 up to 200 and repeat over and over again... Port engine holds steady at 155degrees. These temps are at a cruise of 3900 rpm at 39mph...

We’re now thinking of swapping the sensor to see if it happens on the other engine.

Any other thoughts? Mercury said it’s normal for oscillation on that engine in cold water, but now the Bay temps shouldn’t affect it.

We never hit limp mode this time, but the oscillating temps make me crazy and anxious as you can imagine...

Love to get other input from the pro’s...

Do do have an extended warranty for 2more years, but would love to get this issue solved and a solid running temp...
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Old 05-21-2019, 01:45 PM
  #26  
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Following up on this thread and oscillating issue i’ve had with my Starboard engine... So we’ve replaced Poppet, water pumps, and did the Mercury recommended hole in the thermostat. The water temp for the Chesapeake Bay is 71degrees. We still get extreme oscillation on the starboard from 150 up to 200 and repeat over and over again... Port engine holds steady at 155degrees. These temps are at a cruise of 3900 rpm at 39mph...

We’re now thinking of swapping the sensor to see if it happens on the other engine.

Any other thoughts? Mercury said it’s normal for oscillation on that engine in cold water, but now the Bay temps shouldn’t affect it.

We never hit limp mode this time, but the oscillating temps make me crazy and anxious as you can imagine...

Love to get other input from the pro’s...

Do do have an extended warranty for 2more years, but would love to get this issue solved and a solid running temp...
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