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I think my truck suffers from this TSB
I have a coolant leak from the oil cooler at the end where the oil filter goes. It is dripping from the bottom front between the cooler and the block. I removed the cooler and rebuilt it with all new gaskets and it still leaked. I removed it a second time and cleaned the mounting surface on the block with a wire wheel so that it was shiny clean. It's still leaking just like it was originally before I pulled it out the first time. It seems to be leaking inside and then dripping out the bottom even though there does not appear to be any coolant in the oil. This truck only has 36,000 miles on it so it's not like it's worn out. I found this TSB that appears to describe my problem to a T. Anyone had experience or heard about this before? It sounds pretty complicated since only Navistar engineers can perform this fix.
LIGHT TRUCK: 1996 E-350, ECONOLINE, F SUPER DUTY, F-250, F-350
This TSB article is being republished in its entirety to revise the Navistar assistance scheduling.
Coolant may leak at the rear oil header on some vehicles. This may be caused by a localized thin section of material on the crankcase at the mounting pad radius.
Increase the amount of material at the section where the coolant leak occurs. The service procedure required can only be accomplished with an on-site visit from Navistar engineers. Refer to the following for details.
The procedure for servicing the rear oil cooler header for concerns of coolant leaks has been developed by Navistar. The procedure can only be accomplished with an on-site visit from Navistar engineers. The service procedure has been validated and verified through extensive durability tests. The repair is 100% effective and should not be considered an interim fix. The repair is a permanent action to resolve the coolant leak concern.
The repair is performed by Navistar representatives, not field service personnel. The procedure involves using a precision fixture to install threaded, sealed, and overlapping switch pins. The pins must be installed by Navistar representatives using Navistar's fixture.
Contact Navistar directly via fax to initiate scheduling a factory specialist to your location. Please provide the dealership name, phone number, city, person to contact, and VIN for the subject vehicle. The fax number at Navistar for scheduling is (708) 865-3322.
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