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Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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Old 05-13-2007, 07:35 PM   #1 (permalink)
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what would happen if my thermostat was bad? stuck open the temp would rise to the point of temp light coming on ,fan coming on, overflow would start puking....

stuck closed?
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Old 05-13-2007, 08:10 PM   #2 (permalink)
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Quote:
On 2007-05-13 18:35, TravelinManOhio wrote:
what would happen if my thermostat was bad? stuck open the temp would rise to the point of temp light coming on ,fan coming on, overflow would start puking....

stuck closed?
Actually you have it backwards.

IF a thermostat stuck open cause overheating due to water going through sop fast it has no time to cool down, then how would it get hot to begin with??

A thermostat works like this:

When cold, the thermostat is closed. This keeps water in the engine to get it hot. As the temp increases, the thermostat opens up, letting water thriough to the rad. Eventually the the thermostat will stay open all the time (ie operating temperature.)

SO , how is an open stat going to cause overheating?? If a thermostat is stuck closed, not allowing any water in rad, how would that make it run cold?

Listen, I've run engines of all sorts without thermostats and the nresult is an enfgien that WILL NOT come up to operating temperature.


Also, thermostats are designed to fail in an open position. Why? Becuase it allows water to flow from engine to rad with out overheating the engine.



[ This message was edited by: Greaser on 2007-05-13 19:12 ]
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Old 05-14-2007, 09:24 PM   #3 (permalink)
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ok, then you solved my thought on the problem.

I had a blown head gasket, without thinking of solving the cause i simply replaced the gasket and rode. not a problem when it was cold outside (rode 5 times, 30-60 degrees). rode last week and temp light came on while riding home, thought to self "thats just the idiot light because of the ground wire issue" now I have another blown head gasket.

Is the culprit the thermostat or the water pump? or maybe something else I haven't considered yet?
The coolant must not be circulating.

symptoms of a blown head gasket:

hard to start =
compression loss into the coolant chamber and coolant puking out of the overflow drain before coolant temp has started to rise.

After coolant temp rises, pressure of coolant is greater than engine compression and coolant leaks into the cyls and burns causing whitish smoke from exhaust until actual coolant might get to the exhaust and you hear a sound of steam. :hammer:
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Old 05-14-2007, 11:45 PM   #4 (permalink)
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I don't want to wrongly diagnose your problem over the internet BUT I had an overheating issue about 2-3 years ago and what I did was 1) thoroughly flush and replace the coolant 2) new rad cap. I would suspect you have other issues which I don't want to guess at.

I have found with this bike and my last TBS that the marking on the overflow tank are kind of high. I fill it up but it will spit out until it get's slightly below the add line. I've had two TBS's and they both did this so I assume it is normal, never thought of asking anybody else....BUT there has never been any overheating issues(light coming on) EVEN when trapped in summer traffic at 100+ deg.



[ This message was edited by: Greaser on 2007-05-14 22:47 ]
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Old 05-15-2007, 08:24 PM   #5 (permalink)
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As for coolant loss, I have been riding it in cool weather and only felt it was running rough after a warm ride without any coolant loss, even on the warm day. after letting the bike cool and not riding for a couple of days I started it and got about 2 cups of coolant on the ground....more than just a overflow burp. I have a water pump from the old engine that I'm going to replace onto the new engine. with any luck I can try the new head gasket sealer before i take the engine apart. I am only getting a small amount of smoke, no sound of steam in the exhaust yet and my oil doesn't look white in the glass yet so maybe I can seal off the gasket in time.
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Old 05-15-2007, 09:14 PM   #6 (permalink)
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Um.... A blown head gasket doesn't just 'happen' and simple overheating is usually not the cause -- it normally takes a major coolant loss and lots of steaming to get the engine hot enough to warp the head so the gasket can blow.

Most likely your cylinder head is slightly warped at this point, so applying sealer might not do any good.

If you're going to pull the head, have it checked for true at an auto machine shop. If it needs a skim cut to level it, the be sure to only have the minimum cut done or you'll throw off your cam timing.

Most folks don't know that you have to remove an aluminum cylinder head by loosening it in the same pattern as you'd use to torque it into place. If you simply start from one side and loosen the bolts to the other side, it's pretty certain you'll warp it.

Do 1/4 turns loosening it -- in the correct pattern -- until you can turn the bolts by hand and you'll avoid warping. The same deal applies when torquing the head -- gentle steps!

Jim
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Old 05-16-2007, 08:12 PM   #7 (permalink)
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I have already replaced the head gasket once on the engine, right after I got it from the EBAY seller. within 5 minutes of starting the engine after mounting it I had white smoke coming out of the exhaust...after the engine warmed up and coolant got hot I had white colored oil coming out of the cam cover bolt hole area. in another minute I heard steam into my exhaust and thats when the bike quit. I changed the head gasket and all was running ok till outside temp got over 70. I usually ride 80-100 and at below 60 degrees maybe the air temp was enough to keep it from overheating. I already bought another head gasket in case changing the water pump / using sealer and maybe replacing the thermostat don't solve the issue. If I am going to flush and fill and I have the extra water pump and sealer on hand why not put them into play. only 3 bolts hold the pump and I will get to inspect it
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Old 05-19-2007, 07:33 PM   #8 (permalink)
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ok Greaser and jimmyJ900 I will now conceed that it must be a warped head. right after I changed the head gasket the first time I was hearing what sounded like gurgling coming from the area of my carbs. I posted on here asking for any clue/advice as to what could be causing this to happen, now I know. the gurgling I was hearing wasn't coming from my CARBS, It is what you hear (bubbles) when you try to start this engine when there is compression leaking into the cooling system @ the head gasket. After changing the head gasket the first time I would hear this gurgle on the first try to start the bike, then it would stop and the bike would start, the back pressure must have stopped the compression leak enough for me to start the engine. the gasket must have started leaking worse as the outside temp rose above 70 allowing for higher engine temp. My next step may be to use the head off the old engine to get bike up and running while checking/fixing trueness of this head for use on the old engine.

Thanks guys for making me think through past the easy answers.
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