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Author Topic:   Tell Tale timing
SpeedBump posted 01-17-2004 05:58 PM ET (US)   Profile for SpeedBump   Send Email to SpeedBump  
How long should it take a tell tale to start [producing a confidence stream output] after starting an engine?

My Yamaha 40 starts immediately, w/in a second, of the engine firing. My Nissan 70 seems to take a good count of five. Both respond this way when cold or hot.

Should I be concerned with the delay on the 70?

lhg posted 01-17-2004 06:39 PM ET (US)     Profile for lhg    
I would say the longer it takes to show up, the better the engineering design. That means the water is FIRST circulating all the way through the entire cooling passages before exiting the telltale. This indicates you not only have a functioning impeller, but that the engine is getting cooled.

When the telltale begins immediately, all it shows is impeller function, and you have to ASSUME the rest of the engine is getting water.

On my Mercury 200's it takes about two minutes for the telltale to show up. A bit un-nerving at first until you get used to it. This is good. After engine shutdown, the telltale still runs for about 2 minutes, as it drains down!

jimh posted 01-20-2004 09:12 AM ET (US)     Profile for jimh  Send Email to jimh     
[Administrative post]
SpeedBump posted 01-20-2004 10:38 AM ET (US)     Profile for SpeedBump  Send Email to SpeedBump     
Thank you lhg, you explanation sounds good, I am sure glad I don't have two wait two minutes for the teltale to start flowing as with your Merc..

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