www.iFourWinns.com

Greetings -- Finally getting around to de-winterizing the boat. 2004 Four Winns 268, 5.7Gi EF.
I was replacing the thermostat today and notice that it was different than last years. This years number is 3831426. My question is, has anyone else replaced their thermostat this year. When I started the engine on the muffs, the temp went up to 175, then crept up to 200, then back down to 175, then crept up again then back down. It almost seems like th thermostat is a 200 degree instead of a 175 degree t-stat. The risers were cold to the touch as were the hoses. Seems a little odd, is all. Let me know if you've experienced the same results.

Thanks in advance.

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2004 268 Vista "Satisfy My Sol"

Yep, definitely need that thermostat. It's sticking and causing that fluctuation.

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Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.

Current boat: '02 FW 268 Vista
Previous boat: '95 FW 190 Horizon

Same thing happened to me on the first run of the season. Mine stuck at 200 degrees I just put the motor in neutral and revved the motor a couple of times and went back down to normal temp and been fine ever since. Not sure if I answered your question correctly hope this helps.

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1996 278 Vista Dlx Twin 5.0
1999 Sea Ray 215 ex cruiser (sold)
1989 Seaswirl (sold)

Thanks, I think i"ll take her out and see what happens.

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2004 268 Vista "Satisfy My Sol"

Are you sure its the right one for the engine?
Another thing I have found helpful is to use an IR temp gun to monitor temps to verify that the gauge is working right. I find that I get 145-150 at the intake manifold right under the thermo housing and the gauge will say 160 or so.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

This is what Im wondering!

I NEVER depend on the parts counter guy for the correct part, its a crap shoot at best. I google the model number of my engine (In my case 43FBPLKD) and a ton of OEM authentic Volvo Penta parts diagrams come up. I get the part number off of that, try to find the part on the web to make sure its still available, THEN I go to the parts counter. Searching it on the web will also tell you if the part has been superceded with a new part.

I dont hear of thermostats being updated very often; Im sure it happens but LouC and myself just want to make sure its not a goof up and you received the wrong t-stat.

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1997 Four Winns Vista 278
T - 4.3l EFI
Kohler 4esz Genset
379 hours as of 8/8/21

Also I did notice on mine ( I did it last year) it had the temp stamped on it.

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1990 Four Winns Horizon 200
2005 GMC Sierra

I went this site first:
http://www.volvopentastore.com/Circulat ... _id.779577

Then took the part number to the parts store. The t-stat looked different from last year, that is for sure. I have the one from last year, I could put it in and see if I get the same results. I'd also, like to see what temp they have stamp on the t-stat while I am at it.

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2004 268 Vista "Satisfy My Sol"

Crap... I did get the wrong t-stat. I just notice I was looking a the wrong diagram. I was looking at the fresh water cooling diagram. I need this t-stat

http://www.volvopentastore.com/Circulat ... _id.779578

3862835
Replaced by
3587597

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2004 268 Vista "Satisfy My Sol"

You could also test the t-stat buy putting it in hot water to see if it opens up. Just use a pot and a thermomator? and get it to the temp it would open at, and see if it opens.

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1990 Four Winns Horizon 200
2005 GMC Sierra

On most VP engines and later Merc engines the raw water cooling thermostats are rated at 160 degrees...this will give a normal running temp of 160-175 degrees.....

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

Had the boat out this weekend and it ran fine. Temp a little under 175.

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2004 268 Vista "Satisfy My Sol"