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

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  #1  
Old 08-21-2010
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Default Coolant Temp

Hey yall, could the good folks with Detroit engines ie 6V 8V report on their coolant temps (gauge) while in high ambiant/load conditions. Thanks!

Peace&Love,Darren
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  #2  
Old 08-21-2010
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I usually run about 180 when cruising. If I make a hard climb, it will slowly go up to 190 until the fan kicks in, then just as slowly returns to 180.
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Old 08-21-2010
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If I had to tell you from the gauge, I wouldn't be within 5 degrees of accuracy. Maybe even 10.

From the engine computer (using VMSpc) I can tell you that my water thermostat is 180 degrees, and my cycling range for the hydraulic fan is exactly 189-196 (on at 196, off at 189). With the fan override on the temp will drop to near 180 in cool weather/flat ground, and probably the-skies-the-limit in 100+ ambient up 8% grades if I wanted to push it. On such grades I set a personal limit of 200 and will back off however much it takes to keep it at or below that.

The latter condition is rare, and all of the cases I can remember have been on one stretch of California 299 eastbound in August. I will be doing that one again next Saturday. Usually has me down to about 18mph in 1st gear. Fortunately it is one of the few stretches of that road with 2 lanes eastbound.
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  #4  
Old 08-21-2010
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Darren
Our 82 just this month showed highest temps I've ever seen 2 hash marks above 180 on gauge I'm fairly certain its between 195 and 205 as I checked with infared tester shot from both thermostat housings was a 10 degree difference in them.
Outside temp 100--108
pulling 8500 motorcycle trailer
up to 6,000 elevation
speed about 70 mph

The temps freaked me out at first having NEVER seen anything above 180 in past 3 years. Rechecked temps several times when temp showed the
?normal 180? on gauge and I read 174 right side 168 left side. Gauge is off some not bad IMO
I even removed outside louvered cover and inspected radiator for blockage have someone shine light while looking through other side.
Pyro normally 500-600 on heavy pulls MontEagle Tn. This trip saw pyro go up to 725. Infared showed lower, hard to check as is cooles off faster than I can get back there and shoot it.
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  #5  
Old 08-21-2010
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Thanks guys, thats interesting data. Check out this blurb from a DD doucument.

"For continuoue high temperature operation (over 200*F or 93*C coolant out), the use of an SAE grade 50 lubricant in DDC two-stroke cycle Series 53, 71 and 92 engines is required. SAE grade 50 lubricants are also required for all 149 engines where ambient temperatures are above 95*F (35*C)"

According to my research DD reccomends straight weight oils because they are the only lubricants that consistantly meet their high shear rate viscosity rating of 3.70 centipose. Im of the school of thought that a 45w? or 50w oil will have a higher shear rate viscosity than a 40w oil will.

It seems like the guys with 6v and 8v's are at the least playing in the range for SAE 50 oil. What do you guys think about making up some 45w oil by combining 50% SAE 40 and 50% SAE 50 for a little more summer protection but not to viscious for year round use?

Peace&Love,Darren
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  #6  
Old 08-21-2010
Mathew Reichert Mathew Reichert is offline
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Darren,

I run "Bird of Play" between 62-65mph on flat and pull a 2007GMC Yukon.

I have a 8V92 Silver.

It does not seem to matter how hot it is outside, the temp guage reads 180-190 F. The hydrolic fan comes on at 195 F and cools it down immediately to about 180F.

My fan comes on about every 5-10 min. I have spoken with others who's fan rarely comes on. This has been a concern for me as I think my fan may come on too often. I am by no means and expert in this area. I have been thinking of removing my rad and having it professionally cleaned and reinstalled.

I will be watching your thread to pic up some ideas.

Thanks for the post.

Sincerley,
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Old 08-21-2010
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What about oil temps? My 8V92's water temps run in about the range that everyone has reported, but my oil temp stays at a constant 215 unless I am pulling a long hill, where it goes up to 230. This seems high to me. Is it?
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  #8  
Old 08-21-2010
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Mine hits 230 also, but I think that is fine, and is a function of where it is taken. Shooting the sump shows it to typically be around 180 and often less.

Allison says "normal" operating temperature is 160-220, and it is too hot when the sump temp is 270.
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  #9  
Old 08-21-2010
Jim Harvie Jim Harvie is offline
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Ed. Where things have changed this year, as opposed to the years past. got to admit,, those ambient temps have been high this summer, but I'd keep an eye on it, if it dosen't come back to where it was before, you may want to have the radiator flow tested.
May be a way to have it done while it's still in the bus?
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  #10  
Old 08-21-2010
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Default Coolant Temp

This trip we're on through south Texas, New Mexico, Arizona, and California has been the highest I have ever experienced. From Austin, TX all the way to El Cajon CA the outside temps were from 98-100-105-108. Leaving Yuma two weeks ago it was 111 degrees. My coolant consistantly remained at 180-190 degrees - oil remained between 200 to 210. Tranny oil temp 200 to 220.

When we started climbing west of Ocotillo, CA the ambients had dropped to 105 degrees. I was concerned but never experienced any appreciable increase in fluid temp. Of course I took it pretty easy and pulled over a couple of times to cool down.

Steep grades and high outside temperatures scare the bejeevers out of me. I'm not real excited about driving through the Mojave tomorrow and pulling that grade West of Needles.

FYI I'm running straight 40 wt Dello 400 in my 8v92.
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