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Old 02-15-2020, 11:44 AM   #1
Mini-Skoolie
 
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Join Date: Feb 2020
Location: Way Out West
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Year: 1991
Coachwork: Century
Chassis: C5500, Bus not a School Bus
Engine: 3116, CAT, 215HP
Rated Cap: 30k
3116 Telma Retarder Install

i picked up a Telma AC51 retarder unit to install in the C5500 CAT 3116/AT545 (hope to be MT643 soon) chassis bus I have. With the hydraulic brakes and the model year of the 3116 that does not have the valve springs which can hold up to an exhaust brake I needed more on hills.

The unit I bought is a AC51 which has the spicer yokes and this one came out of a 2005 C6500 DOD surplus truck. On the max setting it is rated for 900 ft/lbs of brake force which should be enough to slow down when I am hauling a big trailer on the hills.

I have the documents from Telma as they were nice enough to send them over but what I am missing is 1st hand experience from a DIY on installing one. Is there anything to really look out for? I have a great driveline shop in Portland who can get the rear shaft shortened up.

Thanks
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Old 03-17-2020, 01:00 PM   #2
Mini-Skoolie
 
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Join Date: Feb 2020
Location: Way Out West
Posts: 19
Year: 1991
Coachwork: Century
Chassis: C5500, Bus not a School Bus
Engine: 3116, CAT, 215HP
Rated Cap: 30k
With the MT643 trans swap almost completed I will get going on this install since no one appears to have done one.

The unit I have came out of the newer chassis C5500/C6500 bit it looks like most of the drivetrain basics are the same.

Telma was awesome and gave me the installation sheet for the unit which I have dropped in my shareable google drive for anyone to download.

I was supposed to head to the races but with everything being cancelled I will have time to get this installed in the next few weeks.
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Old 03-17-2020, 06:00 PM   #3
Bus Crazy
 
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Location: Virginia
Posts: 1,371
Year: 1971
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Chassis: International Loadstar 1700
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A Telma is on my wish list for my bus, so will be interested your installation.
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Old 03-19-2020, 01:38 AM   #4
Bus Crazy
 
Join Date: Sep 2015
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Year: 2002
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Are you going to post your retarder install here, or in your transmission swap thread?
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Old 03-19-2020, 04:07 PM   #5
Mini-Skoolie
 
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Join Date: Feb 2020
Location: Way Out West
Posts: 19
Year: 1991
Coachwork: Century
Chassis: C5500, Bus not a School Bus
Engine: 3116, CAT, 215HP
Rated Cap: 30k
I will be posting it in this thread.
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Old 03-26-2020, 05:37 PM   #6
Mini-Skoolie
 
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Join Date: Feb 2020
Location: Way Out West
Posts: 19
Year: 1991
Coachwork: Century
Chassis: C5500, Bus not a School Bus
Engine: 3116, CAT, 215HP
Rated Cap: 30k
Here is the Telma unit and all of the parts I recieved. Based on what I have and the manuals it is everything.

The fun part will be what to do with the ABS connections as my GMC is a 1991 model which has all of none of the ABS.





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