R 30 P/U 2WD V6-262 4.3L (1987)
Heater Hose: Technical Service Bulletins
Cooling - New Style Hose Clamp
Number: 92-03-6B
Section: 6B
Date: AUGUST 1991
Corporate Bulletin No.: 166201
Subject:
NEW STYLE HOSE CLAMP
Model and Year:
1983-92 ALL C/K AND 1987-92 R/V TRUCKS
WITH 4.3L, 5.0L, 5.7L, 6.2L, 7.4L ENGINES
A new design hose clamp will be used in production starting with the 1992 model year on C/K trucks. Usage of this clamp will expand to include other
models in the 1993 model year. The Mubea constant tension hose clamp was designed to reduce the amount of coolant leakage from radiator and heater
hoses.
With the previous design, screw type clamps, it is difficult to maintain a constant load on the hose connection. Some of the load is lost under certain
temperature changes. The Mubea clamp exerts a relatively even and constant pressure that is maintained under varying temperature conditions.
SERVICE PROCEDURE:
^
The Mubea clamp must be installed on a hose which will be put on to a clean, dry, paint free surface. If lubrication is necessary for assembly, only
GM lubricant P/N 998562 may be used.
^
Production of trucks with the clamp began 02/91, starting with the water pump and radiator connections. The heater hoses will follow in some
applications.
^
If the vehicle was originally built with Mubea clamps, the clamp should be replaced with the same P/N Mubea clamp and not a screw type hose
clamp.
^
Also if the vehicle was originally built with screw/worm type clamps, the clamps should be replaced with screw/worm clamps.
Note:
Standard pliers or hose clamp pliers will not work well on the new style clamp. Various tool companies have developed special pliers to install and
remove these hose clamps. Some companies may have a plier available that is effective in removing the larger size clamps but may not open wide
enough to accommodate the clamp once it is off the hose and relaxed. Do not compress the clamp (permanently) to make the tool fit it, since this will
decrease the effectiveness of the clamp. GMC does not endorse any specific tool or company. Check with local sources to determine availability.
PARTS INFORMATION:
Mubea clamps will be used in the following applications:
Size
Part Number
Application
27 mm
10108255
Heater Hoses
24 mm
10146975
Heater Hoses
42 mm
15671833
Radiator/Water Pump Hoses
50 mm
10108249
Radiator/Water Pump Hoses
55 mm
15671832
Radiator/Water Pump Hoses
Note:
The clamp's size is stamped on the tab of the clamp.
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty use:
Labor Operation: J3340
