This is my first PSD and was woundering if the loud siren sound that is coming from the engine is normal?

I was pulling a small hill and near the top of the hill the engine started sounding like it was winding up to blow!

This has happend a couple times, and I have only towed about 100 miles and only went up a couple steep hills so far.

 

Probably your electric fan kicked on.

 

It sure didn't sound like any kind of fan. More like a jet engine. Or a siren starting up.

 

Be sure your turbo hoses are all the way connected. If one has a leak it could sound like what you describe. And usally a slight loss in power because of the boost you are loosing.

 

You do know you have a turbo don't you? They sound like jet engines.

 

Same thought I had until I read the part about cresting the hill.....so I went for the screaming fan on this one. My first answer was Mother-in-law.....usually the whine is constant in a situation like that...

 

It was hot as hell this weekend and I was going thru some West Va mtns and I heard the noise for the first time as well. Definitely the fan.

 

It's your fan...I posted about 4-5 times on the forum with the same question. It is definately your fan.

Let me ask you a questions, did your heart sink the first time you heard it? Mine sure did, I thought my engine was going to blow up.

 

Quick question. I was pulling our trailer through the mtns this past weekend, I too heard what I assumed was the fan, based on what I've read on FTE before. But I noticed it seemed to get loader if I pushed the throttle. Is the fan variable with engine RPM? In other words, when there is a need for fan cooling, does the speed of the fan vary with how "hard" the engine is working or is it just a simple on or off?
thanks

 

the fan speed varies with engine temperature(actually runs with P/s fluid) technical name is hiscotronic. turbo sound will be higher pitched, also changes, only with engine load and speed.

 

NO,,,my heart didn't sink.

But I think the wifes did..LOL She was very concerned...

I just figured that it was the nature of the beast!!!

 

Pretty cool sound, scares you at first, thermostatically controlled. notice temp gauge should stay constant.

 

My 5.4 dosent' make a sound and runs all the time? Shouldn't it be disengaged when it's 0 degrees out? I would love for my fan to make the tractor trailer fan sound!