A/T - Updated Oil Hose Fittings on Oil Cooler
86MERCEDES02TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: September 1986 (supersedes NM 27/11, Sept.1986 REF..NO. MBNA 27/11a and 27/73, April 1986)
SUBJECT: OIL HOSE FITTINGS ON TRANSMISSION OIL COOLER MODELS 107, 124, 126 AND 201 WITH AUTOMATIC TRANSMISSION MODEL YEARS 1985 AND 1986
FIGURE 1 - COLLAR NUT:
On the above mentioned vehicles with alloy cross flow radiators, the oil cooler fittings are secured to the radiator with aluminum collar nuts (a, Figure 1).
These aluminum collar nuts should be replaced with nuts and washers or collar nuts made of steel, according to the table on page 2.
NOTE: As of the end of March 1986 production, a steel collar nut is used.
We recommend that every vehicle being serviced or repaired is visually inspected. If the oil cooler fittings are secured with aluminum nuts, they should be replaced with the steel type.
NOTE: Remove and replace one retaining nut at a time to reduce possible leakage.
Model Model Year Steel Collar Nut Steel Nut (M16 x 1.5) &
(M20 x 1.5) Steel Washer (M16)
126.037/044 1985 both connections
201.024/122 1985 both connections
107.048 1986 up to 3/86 upper connection lower connection
124.030 1986 up to 3/86 both connections
126.035/039/ 1986 up to 3/86 both connections
045/125
201.024/034 1986 up to 3/86 both connections
201.126 1986 up to 3/86 upper connection
lower connection
Tighten the steel nut/steel collar nuts to 25 N-m. Tighten the retaining nut for A/T oil hose to 15-20 N-m. Check and replenish coolant and automatic transmission fluid as necessary.
Parts Information
Part Name Part Number
Steel nut 003 990 16 51
Steel washer 003 990 77 40
Steel collar nut 000 990 24 50
Time Allowance
02-2738/50/70/80 Automatic transmission oil cooler attachment nuts
11/15/41 and washers, exchange
0.5 hour
42/43
0.7 hour
44
0.6 hour