Rear Axle - Correct Routing

91ford22

Article No.
91-15-11

07/24/91


AXLE - VENT HOSE ROUTING - 8.8 INCH AND 10.25 INCH RING GEAR REAR AXLES


LIGHT TRUCK: 1987-91 BRONCO, F-160-350 SERIES


ISSUE: Rerouting of the rear axle vent hose provides better protection against water entering the axle through the vent hose.

Figure 1:

Figure 2:

ACTION: Check the location of the rear axle vent hose routing which is identical for F-150/250/350 and Bronco Light Trucks. The rear axle vent hoses are mounted on the left hand frame rail (driver's side). This location provides better protection against water entering the axle through the vent hose. Refer to Figure 1; Correct Vent Hose Routing. Previously, vehicles with aft fuel tanks were equipped with the vent hose mounted on the aft axle cross member. This routing has been discontinued. Refer to Figure 2; Incorrect Vent Hose Routing.


NOTE: ALWAYS CHECK TO MAKE SURE THE AXLE VENT AND VENT HOSE ARE NOT PLUGGED WHEN SERVICING AXLE.

The purpose of the vent is to prevent pressure or vacuum buildup in the axle during various driving conditions and temperatures. If the vent is plugged with mud or debris the axle cannot "breathe".

PART NUMBER PART NAME CLASS

372047-S100 Clip (Pkg. of 4) BS
390312-S Cap Plug (Pkg. of 6) S
D3PZ-17543-D Hose (Bulk 50' Roll) BM
376545-S8 Clamp Hose S
E8TZ-4022-A Vent Fitting (Pkg. of 2) B
E3TZ-2K321-A Spacer C

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
911511A Vent Hose Reroute 0.3 Hr.
DEALER CODING
BASIC PART NO. CONDITION CODE
4022 36
OASIS CODES: 509000, 510000