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| 268 Vista with 5.7 GSi - Operating Temperature https://www.smwebhead.com/phpBB3/viewtopic.php?f=6&t=16022 |
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| Author: | Surface Interval [ Wed Jun 27, 2018 4:36 pm ] |
| Post subject: | Re: Vista 268 with 5.7 GSi - Operating Temperature |
I believe that the owners manuals and parts catalog will identify the thermostat as 175 deg F. The boat engine should approach that temp. It may take a little longer in cold water, but in 60 + deg water the temp should come up to between at least 1/4 to half scale on the gauge. On mine mid scale is 175. It normally runs around 165-170. |
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| Author: | acguy [ Thu Jun 28, 2018 10:52 am ] |
| Post subject: | Re: Vista 268 with 5.7 GSi - Operating Temperature |
take an infrared thermometer and check the risers to confirm if it's reading properly, sound like the stat is stuck open now if the sender is reading properly |
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| Author: | LUBA [ Thu Jul 05, 2018 9:38 am ] |
| Post subject: | Re: Vista 268 with 5.7 GSi - Operating Temperature |
My 2001 had 160 thermostats |
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| Author: | LUBA [ Fri Jul 13, 2018 12:47 pm ] |
| Post subject: | Re: Vista 268 with 5.7 GSi - Operating Temperature |
I put 2 new OEM ones in they are 160, and both motors run consistantly at 160 confirmed by my engine gateways hooked up to my Axiom. I watch them quite a bit. i don't trust the stock analog guages. BTW my 01 had a lot of rust flakes/rust in there and they were hard to remove, wondered if they were working at all.....IDK. |
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| Author: | LouC [ Fri Jul 20, 2018 10:42 am ] |
| Post subject: | Re: Vista 268 with 5.7 GSi - Operating Temperature |
If the engine is running way too cool I bet what you will find, is rust flakes from the intake manifold stuck in the thermostat so that it never closes all the way. This will for sure cause very slow warm up, sometimes they will dislodge when running on plane but sometimes they don't. I have started removing the stat at the beginning of each season and cleaning it, the housing and the intake out so that I'm at least starting with no rust flakes there to cause this issue. One of the many draw backs to raw water cooling. With closed cooling you would never have this issue... |
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| Author: | LouC [ Sun Jul 22, 2018 4:54 pm ] |
| Post subject: | Re: Vista 268 with 5.7 GSi - Operating Temperature |
While the stat may be new, there will be rust flakes a plenty in the old cast iron intake manifold. That's why I have taken to cleaning it out in the beginning of the season and testing the thermostat in a pot of heated water. You have 18 years of raw water cooling in a cast iron engine, that's what happens. After I took my old engine apart last year to repair the blow head gaskets, I'd never have another raw water cooled engine in any inboard that I have here in salt water. Just installing a set of re-man heads, alone, dropped the running temp about 15*. That tells you how much rust and sediment was in the head water passages, impeding cooling. The block/crank/pistons/rods/cam/lifters etc are original and I'll run it as long as it lasts, then re-power with a new GM marine long block with closed cooling. |
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