Usage:
3406C And 3406E Truck Engines
- SUPPLEMENT: 08/01/95
Truck Engine News, July 1995, Page 3, "New Standpipe Installed On Water Pumps"
The last sentence in the article includes an incorrect torque. The correct last sentence follows:
Use a 3/4 inch wrench to hold the standpipe cap while turning the 1/4 inch hex socket counterclockwise to a torque of 3.5 ± 0.5 N·m (31 ± 4 lb in).
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Description of Change: Beginning with 3406C (8PN4084) and 3406E (5EK50234) all production 3406C and 3406E Truck Engines have water pumps that include a standpipe in place of the filter in the water pump weep hole. The new standpipe will contain normal seepage associated with the lubrication and cooling of the water pump seal. If larger amount of coolant leakage occur, the coolant will overflow out of the standpipe. This will indicate water pump service is required.
Adaptable To: The 127-0890 Standpipe is available through normal part ordering channels. Rather than replacing the entire water pump, this standpipe should be used as a "first step" to remedy customer complaints of block discoloration near the weep hole or small amounts of seepage around the weep hole.
Installation Instructions
Before installing the new 127-0890 Standpipe, remove the 108-5959 Filter from the water pump weep hole.
NOTE: Make sure the filter is removed. Failure to remove the filter could make the standpipe ineffective.
Insert the new standpipe into the water pump weep hole until the standpipe cap contacts the machined surface of the water pump housing. Use a 3/4inch wrench to hold the standpipe cap while turning the 1/4inch hex socket counterclockwise to a torque of 6.5 ± 0.5 N·m (57 ± 4 lb in).