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Country Discussion Topics
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International T-444e engine
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Tom A    Posted 10-08-2001 at 04:48:29       [Reply]  [Send Email]
Can anybody tell me what the radiator cap pressure ought to be for one of these engines? (It is mounted on a 44 passenger bus).

Engine was losing coolant; mechanic couldn't find a leak and decided it was radiator cap. He replaced old cap with a 7 PSI cap (which seems awfully low to me). I did not see the original cap so I don't know what the pressure rating was.

I don't have an opportunity to troubleshoot while the thing is running, but I'm told it is now using a gallon of coolant every 2-3 hours of run-time (more than before replacing the cap) and I can't find any trace of a leak...and there's no water in the oil either and no unusual exhaust. The engine is running *slightly* cooler than normal. I'm starting to think the old cap was in fact failing, but that the new cap is the wrong one.

thanks for any info or ideas!


JoeK    Posted 10-08-2001 at 08:59:25       [Reply]  [No Email]
Had similar problem with old camper/bus yrs ago,couldn't find any leakage etc til,DUH!,happened to remember the rear heater in the back....sure enough,cracked hose was way back behind rear wheel....Just a thought.


Lazy Horse    Posted 10-08-2001 at 05:48:20       [Reply]  [Send Email]
Give your local auto supply house a call. They should have a book to show the proper radiator cap for your application. 7 psi does sound awfully low. My guess would be 12 to 14 psi, but some systems go up to 18 or 20 psi. If it's running on the cool side that really doesnt sound like a cap problem, since it should only build pressure under heat and your losing a lot of fluid.


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