Skip to main content ↑ ↓
Topic: Cat 3208 with Allison 643 temps?  (Read 367 times) previous topic - next topic

Cat 3208 with Allison 643 temps?

  I tow a small 2 car trailer in FL. .95*  degrees ,  Stop and go traffic puts my trans temps up to about 230 as it pulls through  1 and 2 nd, Dropping to 190 ish as it locks up  . Are these normal temps ? 
  The engine never gets over 180 and I drive it easy .
 Thanks as always .

Re: Cat 3208 with Allison 643 temps?

Reply #1 –
Sounds normal with the torque converter unlocked.

About all you can do is slip it into neutral if stopped at a long light.  Rev the engine a little to get more air flow over the transmission cooler.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Cat 3208 with Allison 643 temps?

Reply #2 –
Quote from: Protech Racing –
  I tow a small 2 car trailer in FL. .95*  degrees ,  Stop and go traffic puts my trans temps up to about 230 as it pulls through  1 and 2 nd, Dropping to 190 ish as it locks up  . Are these normal temps ? 
  The engine never gets over 180 and I drive it easy .
 Thanks as always .
Sounds just like ours in city traffic. Our engine temp does go to 200 on grades in the summer and the tranny temp follows it.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)
 

Re: Cat 3208 with Allison 643 temps?

Reply #3 –
Quote from: Protech Racing –
  I tow a small 2 car trailer in FL. .95*  degrees ,  Stop and go traffic puts my trans temps up to about 230 as it pulls through  1 and 2 nd, Dropping to 190 ish as it locks up  . Are these normal temps ? 
  The engine never gets over 180 and I drive it easy .
 Thanks as always .
I saw the same when I got my coach, I used an IR gun and found the actual temp to be in the 150's, installed a new sender and problem solved..
Transmission Temperature Sender Resistance
Len Barron
1988 GV36 U280 3208T(250hp)/MT643
1972 Jeep Commando LS2/4L65e
2000 Chevy Express Hightop Campervan
LBZ Duramax /6sp Allison