Exhaust Manifold - Exhaust Leaks
Article No.98-15-6
08/03/98
EXHAUST - EXHAUST LEAK AT EXHAUST
MANIFOLDS - VEHICLES EQUIPPED WITH 7.0L OR
7.5L ENGINE
LIGHT TRUCK:
1993-96 E-35O
1993-97 F SUPER DUTY, F-250 HD, F-350
MEDIUM/HEAVY TRUCK:
1992-97 F-700, F-800
This TSB article is being republished in its entirety to correct the Labor Operation Times listed.
ISSUE
An exhaust leak at the exhaust manifolds may be evident on some vehicles. This may be due to heat causing a reduction in bolt torque on the exhaust manifolds.
ACTION
Install new exhaust manifold bolts. Refer to the following Service Procedure and Part Application Chart for details.
SERVICE PROCEDURE
1. If an exhaust leak exists at the exhaust manifold due to a reduction in bolt torque, remove the manifold bolts and the exhaust manifold and check the overall flatness of the manifold. The manifold should not exceed 0.25 mm (0.010") out-of-flat. Refer to the appropriate model/year Service Manual for manifold removal procedures.
2. If the vehicle is covered under the emissions warranty period, replace the manifold if it is out-of-flat. If the vehicle is out of the emissions warranty period, resurface the exhaust manifold.
NOTE
IF THE MANIFOLD IS TO BE RESURFACED, THE BOLTS MUST BE SHORTENED TO ACCOMMODATE THE EXHAUST MANIFOLD. THE BOLTS SHOULD HAVE THE LEADING "DOG POINT" REMOVED TO PREVENT BOTTOMING INTO THE HOLE.
3. Install the manifold using new mounting hardware, but DO NOT USE WASHERS TO INSTALL THE MANIFOLD. Torque the bolts to 34-47 N.m (25-35 lb-ft).
NOTE
THERE SHOULD NOT BE ANY TYPE OF GASKET USED BETWEEN THE EXHAUST MANIFOLD AND THE CYLINDER HEAD.
4. Check all exhaust system fittings loosened during repair for adequate tightness and allow engine to warm up. Recheck exhaust system for leaks and repair as required.
Parts Block
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 97-26-23
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage
OPERATION DESCRIPTION TIME
981506AL Replace Exhaust Manifold, 1.5 Hrs.
Left Side - 1993-96
E-350/E-Super Duty 7.5L
981506AR Replace Exhaust Manifold, 2.7 Hrs.
Right Side - 1993-96
E-350/E-Super Duty 7.5L
981506AT Replace Exhaust Manifold, 3.8 Hrs.
Both Sides - 1993-96
E-350/E-Super Duty 7.5L
981506BL Replace Exhaust Manifold, 2.1 Hrs.
Left Side - 1993-97
F-250HD/F-350/F-Super
Duty 7.5L
981506BR Replace Exhaust Manifold, 2.5 Hrs.
Right Side - 1993-97
F-250HD/F-350/F-Super
Duty 7.5L
981506BT Replace Exhaust Manifold, 4.4 Hrs.
Both Sides - 1993-97
F-250HD/F-350/F-Super
Duty 7.5L
981506CL Replace Exhaust Manifold, 1.2 Hrs.
Left Side - 1992-97
F-700/F-800 7.0L
981506CR Replace Exhaust Manifold, 1.2 Hrs.
Right Side - 1992-97
F-700/F-800 7.0L
981506CT Replace Exhaust Manifold, 2.2 Hrs.
Both Sides - 1992-97
F-700/F-800 7.0L
DEALER CODING
CONDITION
BASIC PART NO. CODE
9430 12
OASIS CODES: 403000