#1
IP: 45.148.7.5
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Is This Normal For a a Holley TStat?
One of the latest projects is inspecting and understanding my cooling system. I just did a vinegar soak (2days) and plan to repeat. After the 1st flush, while at the dock in gear (1200RPM) the temp rose to just over 200F, then I clamped the bypass hose. After about 1 min the temp fell sharply to 150F. Seems like a good flow of water at the exhaust (some white smoke). I decided to check condition of Tstat so removed it from the rusty soup, took it apart and cleaned it up with vinegar and CLR. While testing it in pot of water the "mushroom" piece only opens about 1mm around 180F. Does that seem right in terms of allowing sufficient water diversion? Photo attached. I want to reassemble everything but wonder if the Tstat is working properly and whether I should simply remove it as so many of you seem to have chosen to do. I intend to install a ball valve in the bypass hose as I'm convinced on it's benefits for running cooler.
Thank You in advance DonC |
#2
IP: 32.211.28.40
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Sounds like that thermostat isn't working. Recommend removing (or replacing). Overheating an engine will often kill the thermostat. Try it without a thermostat, you may just like it. I did about 20 years with no thermostat.
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#3
IP: 173.230.183.5
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That's where I'm at now Al. I removed the stat and ran the engine in gear at the dock @1200. This time couldn't get temp over about 110-120F !!! Even with bypass valve open. The lake water's not too hot or cold. t's currently sitting in vinegar for a few days then I'll retest. What's the downside of a cool running engine?
Thanks DonC |
#4
IP: 104.174.83.118
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Fuel consumption, power and harmful contaminants in the oil to name a few.
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#5
IP: 32.211.28.40
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Neil may be right - don't know.
If fuel consumption increased, I didn't notice it. Power? I still had enough. Oil contaminants? Changed oil annually. I considered running my engine hotter when I was thinking of installing a water heater. Never got there. Oh yeah, soaking in vinegar isn't going to restore it to life. If it was overheated, it probably lost some of the wax in the module. Wax expands when it melts - that's how a thermostat works. Overheat, overexpansion, failure of the capsule. Last edited by Al Schober; 08-07-2021 at 07:16 PM. Reason: Oh yeah,... |
The Following 2 Users Say Thank You to Al Schober For This Useful Post: | ||
Dave Neptune (08-07-2021), Sam (08-08-2021) |
#6
IP: 45.148.7.2
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Thank you Al and Neil. Wax really? Thought it was due to thermal expansion of the metal slug inside. Anyway I shall retest some more and report back.
DonC |
#7
IP: 104.174.83.118
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Quote:
Oh yeah, serious oil contaminants and the reason short start ups in the slip are detrimental for your engine in the long term. Here is the last paragraph from this source:(while reading the last sentence think 'engine not allowed to reach full or preferred operating temperature') Quote:
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
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