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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #71  
Old 10-31-2012
Chuck Chuck is offline
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Default What about a pressure gauge

I am thing about a pressure gauge in the coolant lines. It would warn of a loss in pressure a lot quicker than the temp gauge. Pros or cons?
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  #72  
Old 10-31-2012
TeeJay TeeJay is offline
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I am thing about a pressure gauge in the coolant lines. It would warn of a loss in pressure a lot quicker than the temp gauge. Pros or cons?
The cooling system pressure is controlled by the radiator cap. In my case the cap is 7 psi. It takes less than a blink of an eye to lose 7 lbs if you blow a rad or heater hose. I doubt you would even catch it. The temperature however, will take longer to rise. Not much but longer.
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  #73  
Old 10-31-2012
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i used to run a pressure gauge on my stock cars.
If you dump your coolant the temp gauge will not move,it takes coolant on the sender to make the gauge move.
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  #74  
Old 11-01-2012
TeeJay TeeJay is offline
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i used to run a pressure gauge on my stock cars.
If you dump your coolant the temp gauge will not move,it takes coolant on the sender to make the gauge move.
Interesting! However, as long as the pump is circulating coolant the sender would be operating and as the coolant depletes the temperature would rise. I think your chances are better of seeing the temperature rise than seeing a pressure drop. But a warning buzzer (yeah another one) would alert you instantly of a pressure drop in the cooling system.
What was the coolant pressure you ran in your stock cars?
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  #75  
Old 11-01-2012
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Coolant pressure on a hot night would run 15lbs or so.
We were not worried about the pressure,it was lack of pressure we worried about.
Lack of pressure meant we had a coolant leak,or no coolant.
You could check it during red flags or cations,but never during the race.
Richard Petty ran a pressure gauge on his cars,way back when..
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  #76  
Old 11-01-2012
TeeJay TeeJay is offline
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[QUOTE=Randy Dupree;183279]Coolant pressure on a hot night would run 15lbs or so.

Lack of pressure meant we had a coolant leak,or no coolant.
OTE]

Or a bad rad cap.
Thanks
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  #77  
Old 11-01-2012
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[QUOTE=TeeJay;183283]
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Originally Posted by Randy Dupree View Post
Coolant pressure on a hot night would run 15lbs or so.

Lack of pressure meant we had a coolant leak,or no coolant.
OTE]

Or a bad rad cap.
Thanks
Correct,we ran a 22lb cap,and checked that and the rad every week.
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  #78  
Old 11-01-2012
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i used to run a pressure gauge on my stock cars.
If you dump your coolant the temp gauge will not move,it takes coolant on the sender to make the gauge move.
I can attest to that. I once had a British MG Midget sports car. While out driving through the Berkeley-Oakland hills very late in the evening, the engine suddenly stalled.

After inspecting all that I could (in the dark of night with a dim flashlight), I didn't see anything amiss. I then tried restarting it -- and it fired right up. I carefully checked all the gauges. Everything was normal (including the water temperature gauge). Engine sounded strong. I continued on my way.

About 2 miles down the road, the oil pressure went way down and with terrible grinding noise, the engine seized up -- stepping on the clutch i was barely able to pull onto the shoulder.

After towing back to the dealer (where I'd bought the car a few days before), it was found that a "freeze plug" had fallen out of the block -- the coolant water shot out and hit the distributor, shorting it out and stalling the engine.

However, in the dark, between the hot engine and hot water, the coolant evaporated fairly quickly, so when I inspected there was insufficient evidence of what happened to tip me off. Indeed, it dried so rapidly that the electrical short that shut me down was resolved after only 10 or 15 minutes, when the engine restarted.

I learned a LOT that evening -- pressed into memory by a 4 mile walk back to my apartment (thank goodness, most of it was downhill). The incident occurred on a remote road, I was wearing a black leather motorcycle jacket, and when I tried to flag down the rare passing car .... they all sped up as they went by. More lessons learned!

Ultimately, the dealer who sold me the car, offered me "100% credit" toward a new MG B GT sports car. Under the circumstances, a deal I couldn't turn down. That car turned out to give me a whole new set of lessons (and ended my interest in owning British sports cars).
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