| Author |
Message |
Jack Conrad (Jackconrad)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 22, 2005 - 5:16 pm: | |
I am getting ready to add a air to oil trasmission cooler on our MC-8 with an Allison 740 transmission. While making new hoses to tie the new cooler into the existing system, I decided this would be a good time to relocate the transmission filter. When looking at the existing system, I found that our transmission has 2 filters. A spin-on type with hoses from the filter ports on the transmission. The hose from the cooler port goes to the cooler attached to side of the engine, return hose goes to a carttidge type filter with another hose from this filter to the transmission cooler return port.
Question #1. Is this sceondary filter neccessary?
Question #2. The spin-on filter housing is presently installed just below the top of the transmission, can ity be installed about 1 foot higher than the transmission? |
Dale L. Waller (Happycampersrus)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 22, 2005 - 6:37 pm: | |
Jack, As per "da book" Allison says to clean or replace the internal filter at overhaul or initial transmission installation. The spin on should be changed every 6 months and fluid every 12 months or 25,000 miles. That spin-on is the only one you would service unless you have a problem were you would remove the pan. Didn't see anything about a cartridge type filter. maybe someone else will chime in that has seen one. Personal experience with heavy equipment I would say you can move the spin-on filter with no problems. |
Jack Conrad (Jackconrad)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 22, 2005 - 8:58 pm: | |
The cartridge type is not inside the pan. It is installed next to the spin-on and is the same size, just cartridge type instead on spin-on. Jack |
Earl-8-Ky
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 22, 2005 - 8:58 pm: | |
Jack the carttidge type is a add on and it can be removed. The spin on filter can be relocated. The system is a ful preasure type and has plenty of preasure to pump the oil any where you want to put it. I find that mine helps keep the engine temp down. Run your oil thru the add on cooler first and then to the engine cooler. It sure helps my bus. |
jimmci9 #2
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 23, 2005 - 9:25 am: | |
as far as plumbing the additional air-to-oil transmission cooler in, make sure that you don't restrict the lines any.. use #20 single wire hose... if your cooler has smaller than 3/4" pipe fittings, i recomend not using it...and plumb it AFTER the cooler mounted on the engine.. otherwise you'll possible reheat the oil to whatever engine temp is...a good condition cooling system (water piping, hoses, thermostats, radiator, fan, fan drive, water pump, etc) will remove about 12-18 degrees of heat... less than that and you'll have overheat problems... more than 18 degrees suggests a coolant flow problem ( like a stopped up radiator core..) and you'll also have heating probs...locate the air type cooler where you can get a good airflow acroos it....and try not to locate the hoses next to any hot parts....like the exhaust manifolds... the rubber hoses will hold heat and add it back to the cooled oil.... |
Jack Conrad (Jackconrad)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 23, 2005 - 9:51 am: | |
Thanks all for the help. The 19 1/2" x 24" cooler just did fit in the right engine compartment side door. Cooler fittings are 3/4" pipe. I installed a 3000 CFM shrouded electric fan to pull outside air over the cooler. The shroud is the same size as the cooler. I have not re-installed the door skin yet,, but plan to add a piece of expanded wire mesh to protect the fins. Jack |
Buswarrior (Buswarrior)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 13, 2005 - 11:12 pm: | |
Hello jimmci9.
Particularly those of us in northern climates have to be careful to NOT overcool the transmission.
The primary consideration of adding a tranny cooler in an MCI is to reduce the load on the radiators in hot weather conditions. We are in effect compensating for insufficient radiator efficiency/capacity to deal with the combined heat load of both engine and transmission.
Find a way to remove the tranny heat, and the rads are able to deal adequately with the engine.
In the hot weather, running the transmission cooling lines from the transmission, to the add-on tranny oil-to-air cooler, and then through the stock tranny oil-to-coolant cooler ensures that any excess transmission heat is shed overboard before the transmission heat reaches the engine coolant, leaving the engine coolant and radiators to take care of only the engine. Good for keeping the engine at the right temp.
In the cooler weather, there is no concern about shedding heat from any component. However, there is a concern about running the tranny too cool. Routing the tranny fluid through an aux cooler last, means rather cool temps for the tranny.
In some cases, it is desirable to warm up the tranny fluid through the oil to water cooler.
FYI
happy coaching!
buswarrior |