Upper Radiator Hose - Rubs Through/Leaks
Group 11Engine
Bulletin Number
11 01 97
Woodcliff Lake, NJ
Jan. 1997
Product Engineering
Perform the procedure outlined in this Service Information on all affected vehicles the next time they are in the shop for maintenance or repairs.
SUBJECT:
Coolant Hose Rubbing
MODEL:
E36 with M52, S50 and S52 engine
Situation:
The upper radiator coolant hose may come in contact with the oil filter when the engine coolant is at operating temperature due to coolant system pressure and expansion of the hose.
A coolant leak may develop in the hose contact area on vehicles with high mileage accumulation as a result.
Vehicles Affected:
This Service Action involves E36 vehicles with M52, S50 and S52 engines which were produce from 10/95 - 6/96.
In order to determine if a specific vehicle is affected by this Service Action, it will be necessary to utilize the "Service Menu" of the DCS (Dealer Communication System. Based on the response of the system, either proceed with the corrective action or take no further action.
The Chassis Number Ranges listed are only for informational purposes and are not to be considered as the only deciding factor.
Correction:
Check the clearance between the upper radiator hose and the oil filter housing on all affected vehicles and replace the hose if necessary.
Procedure:
The following procedure must be performed when the engine is cold:
Visually inspect the upper radiator hose for pressure marks and traces of rubbing at the closest point of contact to the oil filter housing cast boss. (See illustration).
-- If traces of rubbing are found the upper radiator hose must be replaced with the new style hose.
Note:
A modified hose was used in production from approximately mid 11/95 - 6/96 which included an extra rubber pad attached to the outside of the hose in the critical area.
If traces of rubbing are found on the rubber pad area of this type of hose it must also be replaced with the new style hose.
Visually inspect the oil filter housing for any sharp edges (casting burr) on the cast boss area shown.
If a sharp edge (casting burr) is found on the cast boss it must be removed using sand paper or a fine file.
Note:
Cover up the drive belts and pulleys using a clean shop rag before sanding or filing to prevent metal filings from falling onto them.
-- If no pressure marks or traces of rubbing are found on the hose as described above check the gap at the closest point (A) between the cast boss of the oil filter housing and the upper coolant hose.
There must be a gap (A) of at least 7 mm (1/4 inch) when the engine coolant is cold.
-- If gap (A) is 7 mm (1/4 inch) or greater, no further repairs are necessary.
-- If gap (A) is less than 7 mm (1/4 inch), the upper coolant hose must be replaced with the new modified version.
Note:
Partially drain coolant in a clean drain pan to be reused after the repair is completed.
Parts Information:
Service Action Label Instruction:
This Service Action has been assigned code number 180. After the vehicle has been checked, and corrected if necessary, obtain a label (SD 92-070) and:
a) emboss your BMW dealer warranty number in the middle of the label (1);
b) punch out code number 180 printed on the label and,
c) affix the label to the B pillar as shown:
If the vehicle already has a label from a previous Service Action/Recall Campaign, affix the new label next to the old one. Do not affix one label on top of another one because a number from an underlying label could appear in the punched-out hole of the new label.
Warranty Information:
Covered under the terms of the BMW New Car Limited Warranty. Reimbursement for this Service Action will be provided through Campaign Entry.