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  #1  
Old August 3rd, 2008, 08:57 PM
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over hot 300 tdi

Went out to Charles' today to build sliders -- thanks again, Charles! On the way out my temp guage got hot, pulled over, threw water in, it took some and remained 200 degrees or so. On the way home it got Very hot -- didn't overheat, but got hot enough that I called AAA and gave her the first ride home on the rollback. It's apparently a right of passage for all my trucks.

So, 300-knowing-people, where do I start looking? The fan itself is about 8" in diameter, the radiator is tiny; it looks like it would've been a fine set up in Lower Bitchstalking or whatever godforsaken English village it came from, but it can't handle 90 degree US highway driving in the middle of summer.

Where do I start?
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  #2  
Old August 3rd, 2008, 09:25 PM
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How fast were you going and how hot did it get?
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  #3  
Old August 3rd, 2008, 09:28 PM
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65mph 3000 rps 200-210 degrees for 5 mins. on the way back it hit 210 and I pulled over.
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  #4  
Old August 3rd, 2008, 11:05 PM
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Going up long hills at that speed in warm weather I've hit those temperatures before with seemingly no issues.
I now use Redline Diesel Water Wetter and replaced my overflow tank and cap and that appears to have eliminated the problem.

Clark
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  #5  
Old August 3rd, 2008, 11:25 PM
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Those temps are nothing to be concerned about. Just back off the skinny pedal and they will drop in hot weather.
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  #6  
Old August 4th, 2008, 12:50 AM
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Tony,

3000 RPM @ 65 seems way high to me. I remember the truck seemed to be geared low. Since my truck is down for at least a month want to try 33's and see how they work with your gearing ?
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  #7  
Old August 4th, 2008, 08:36 AM
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You're right Doug, it is geared low -- 70 mph is its realistic top speed. Thanks for the offer of 33s, I may take you up on that. Alternative is to regear the xfer case, but I don't feel like coughing up that expense just now.
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  #8  
Old August 4th, 2008, 08:45 AM
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3K does seem a bit high. I can't push mine past 2500.

Recent fluid flush of any kind or pressure test? How's the condition of the fins, tstat, etc?
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  #9  
Old August 4th, 2008, 09:01 AM
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Tony,

Are you loosing coolant ? The comment that you added after the truck got to 200 sounded like you may have a leak or a bad pressure cap. Disco 1.2 boxes can be had for around $250 and would also up your mpg. Since most of your driving is suburban might be a good way to go.
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  #10  
Old August 4th, 2008, 09:08 AM
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It's a fairly recent engine, fins are fine tstat is unknown, but since they're supposed to fail open . . .

As for the 3k, she pulls fine, lots of power, just geared very low.

Follow-up Post:

Doug, it was the same situation we had when you and I brought it back from the docks -- there was some bubbling at the expansion tank cap.

As for the xfer case, I need to crawl under it and see if I can't figure out from a s/n what gearing it has.
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  #11  
Old August 4th, 2008, 09:21 AM
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Tony,

You shouldn't have a coolant drop @ that temp which is probably exacerbating the problem.
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  #12  
Old August 4th, 2008, 10:54 AM
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How was the coolant level when you got home? Did it lose any m since the top off?
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  #13  
Old August 4th, 2008, 10:56 AM
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Only what blew out when I opened the top fill cap, drenching me in boiling anti-freeze. Which was super-fun.

But to answer your question, no, I believe we got it filled correctly at your place.

Could the system itself just not be up to the task at hand? Also, I'm getting (and have gotten for some time) a flickering oil pressure light once it's warm at idle -- research seems to indicate that this is a fairly common fault with the sensor.
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  #14  
Old August 4th, 2008, 11:38 AM
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jim pendleton
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You need a larger radiator. Hopefully you have not done damage already.

JP
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  #15  
Old August 4th, 2008, 11:39 AM
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And that's exactly what I was thinking. What do you fit on your conversions, Jim?

Thanks
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  #16  
Old August 4th, 2008, 12:42 PM
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I know ~190F is normal operating... but what is too hot for a 300?
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  #17  
Old August 4th, 2008, 02:47 PM
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I have them made locally. You can PM me if you want prices. I'd like pictures of your intercooler fitted if you want me to make one for you. I might make a larger radiator if only your intercooler lines pass next to the radiator.. Leaves more room. A D110 on large tires likes a lot of extra cooling.

The trick is not the temperature of 190 or 200, it is if it stabilizes at a certain temperature under load.

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  #18  
Old August 4th, 2008, 02:51 PM
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Good point. Mine is steady under load, but what is the "you better stop temperature"?
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  #19  
Old August 4th, 2008, 03:05 PM
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220 and climbing
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  #20  
Old August 4th, 2008, 08:33 PM
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mine gots to about 205 on really hot days under load on the highway at 65+ but nrver around town where it stays at 180 or less. Is that normal?
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