engine temps

[busshawg]

I have a 1984 MC 9 with 8V71  5 spd manual trans. I am running over size rads and am wondering if it is normal for one head to run warmer than the other. The drivers side or muffler side is running quite a bit warmer than tje other. Thanks

Grant

[redbus]

I would change the thermostats just for S&G and see if it helps.

[buswarrior]

How many degrees warmer?

The oil cooler on that side?

happy coaching!
buswarrior

[loosenut]

I'm second RB's suggestion of trading out gauges.  I was running ragged trying to figure out what was wrong with my engine.  Both gauges showed my temp to be 230-240 on the highway. 

I'd never heard of a gauge going bad before but both of mine are squirrelly.  I changed the sender and the gauge in the engine compartment now it agrees with my infrared thermostat, 170-180 depending on the conditions.

If you don't have an infrared thermostat they are inexpensive and are helpful with diagnostics.

Mike

[JohnEd]

This would seem a question that is critical to answer quickly. 

If you have two gauges and two senders then just connect the gauge lead between senders.  If the same head still reads high then the gauge is bad....either the high or low!!!!!!  If the condition follows, and it should if the gauge system is good, then it is either the senders or the thermostat OR ONE HEAD IS RUNNING HOT.  Next change the senders around and see if it follows the sender.  Then I would replace both thermos.  With the ir temp gun you can look at the rad and see if you have cold spots that indicate blockage.

Use the gun to check the temp of the axl to monitor the wheel bearings and check the tire cause if you start to separate a ply and your pressure is good the tire temp will climb.  Shooting the differential is wise.  A good tool to find air infiltration leaks in summer or winter.  Hot/cold spots on the inside exterior walls.  and on and on.

John the temperate

[eddiepotts]

Look to see what side your cooling fan is blowing on your engine. Mine is on the drivers side and I can see a 20* difference from the passenger side.

[busshawg]

Thanks for your respsonces, The dash gauge has been running around the 190 mark, but last night I went around with my laser and check wheel bearings etc and decided I would check the heads and noticed just as Eddie mentioned, a 20 to 25 degree difference. Yes BW I believe the oil coller is on that side. Not sure what I am looking for but the cooler side of the motor looks quite clean as far as extra hardware attached. The side that is running hotter is much more cluttered, and also has the muffler on that side. I believe it is fine but was very surprised to find such a difference. The hotter side was sitting at 205 degrees, which I believe is still excepatable. I have put approx 6000 miles on the bus and had never checked the heads with may lazer temp gauge before so it may not be a new issue. So as you can tell I have no idea, feed back is greatly appreciated as we are heading out tomorrow again.  I think when I start out tomorrow I will open the valves for the heater core to help disperce the heat , at least until I feel more comfortable.

Grant

[eddiepotts]

I have pulled my hair out over your same issue but I have come down to believing it is my fan for the temp differences. That is what it is for. Now that you have your temp gun make sure you keep an eye on your differential temp. I would be intrested in knowing what yours runs at. Mine was 158*. I think it is good but not something I can fix in the driveway so it is important for me to keep up with. Remember it is made for driving so don't stress to much over it all. Just get your base line readings and keep them recorded in your logs. Have a good trip

[busshawg]

Thanks Eddie, I believe your therory is good, get in it and run it. I will check my diff temps and post in a couple of days providing my blackberry works where I am. To 158 degrees seems quite cool, or good. I used to truck and it wasn't uncommon for the transmission temps to run a few degrees warmer than the collant temps in a hard pull, which put the transmission temps up to the 210 to 220 mark. It had the same oil as the diffs. After running about 40 miles last night with the bus at about 75 mph my drive hubs were reading 114 and 125 on the other side. Not sure why they were different, drive side, sun side etc but to me 125 was plenty cool.

Grant

[JohnEd]

What is the over-temp "auto shut down" temp on a 92 series?   Any body?

I thought the intercoler was supposed to raise the temp on one side.

John

[thomasinnv]

What is the over-temp "auto shut down" temp on a 92 series?   Any body?

I thought the intercoler was supposed to raise the temp on one side.

John

i believe there are 2 possibles for the alarmstats, 210 or 220.

[busshawg]

Hey Eddie,

Sorry it took so long to get back to you. My diff ran at 185, outside temps were around to 90 mark, hibs ran at appox 125 drivers side, 110 passager side. We did the trip and teh drivers side head ran consitantaly warmer but always within 10 degrees.

Grant

[Busted Knuckle]

The side with the oil cooler will run warmer as it has extra heat from the engine & trans oils (if the trans is an Auto that is) where the other side doesn't
  BK 

[eddiepotts]

Well glad to see you had a good trip. I am guessing no problems. My diff seems to be running a bit cooler but I have a mile of 30mph before I park so maybe cooling off a bit. I think my hubs are right on with yours.

[white-eagle]

my 8v92t shuts down at 200.  i know that from a not good experience on i75.  luckily, all ended well.