2012/10/26 Caterpillar

Engine: Truck

All

Truck Engine News, SEBD6757, 1 June 2003, "Policy for the Reuse of the Turbocharger Turbine Housing". Disregard the previous article, refer to the article that follows.

ReferenceSpecial Instruction, REHS0956, "Installation Instructions for Remanufactured Turbochargers"

The Caterpillar Remanufactured Product Group is reannouncing the policy of reusing turbocharger turbine housings with cracks in the volute of the housing.

Illustration 1	g03306876

Illustration 2	g03306936

Studies have shown that all housings will crack in the area of the divider wall. These cracks relieve stress in the housing. Testing has determined that the cracks will stop growing when the cracks reach a maximum length. Testing has also shown that housings that have cracks in the divider wall have lower stress levels than housings with no cracks. There is no difference in performance between housings with cracks and housings without cracks. Therefore, you will see remanufactured turbochargers with cracks in the divider wall of the turbine housing. The cracks are normal (1) and the cracks will not reduce durability.

Illustration 3	g03306977

Illustration 4	g03307016

The following issues will cause a turbocharger to be scrapped:

• excessive amounts of cracks (2)

• cracks in the mounting foot (3)

• cracks that have propagated through the housing

Note: The policy for the turbine housing should not be confused with the criteria for acceptance of turbochargers from Caterpillar Remanufactured Products Group.