Engine - Excessive Oil Consumption
87ford06
OIL CONSUMPTION - 5.0L EFI - VEHICLES BUILT Article No.
JOB # 1 TO 02/01/87 87-7-12
FORD: 1986 LTD
1986-87 MUSTANG, THUNDERBIRD, FORD
LINCOLN-MERCURY: 1986 CAPRI, MARQUIS
1986-87 COUGAR, MERCURY, MARK VII, CONTINENTAL, LINCOLN TOWN CAR
LIGHT TRUCK: 1986-87 E-150/250, F-150/250, BRONCO
ISSUE: Oil consumption (less than 900 miles per quart) may be caused by a missing PCV valve baffle, leaking oil gallery cup plug at rear of tappet valley (passenger car only), mislocated/damaged valve stem oil seals and/or leaking intake manifold gaskets.
ACTION: To reduce oil consumption, use the following service procedure.
1. Check for external oil leakage per Shop Manual General Repair, Section 21-01, and TSB Article No. 86-11-16. Correct any leakage that could cause oil consumption. If no leakage is found, proceed to Step 2 for passenger car or Step 3 for light truck.
Figure 10 - Article 87-7-12:
2. Remove upper/lower intake manifolds. Refer to Section 21-21 of the appropriate Shop Manual for removal and installation procedure. On passenger cars, inspect to see if the PCV baffle is in place on the underside of intake manifold. Replace lower intake manifold assembly (E6SZ- 9424-A) if baffle is missing. See Figure 10.
Figure 11 - Article 87-7-12:
a. With intake manifold removed, take special note of rear oil gallery crossover cup plug at rear center of lifter valley (on passenger car engines). This plug may be leaking oil if it is cocked or if hole was not properly machined. Clean off this area with solvent and seal with two-part epoxy cement. See Figure 11. Replace lower intake manifold, gaskets, and end seals. Apply adhesive (D7AZ-19B508-A) to both sides of front and rear end seals before installing intake manifold assembly. Retorque per TSB Article No. 86-20-4. Final torque on all lower intake manifold attaching bolts should be 23-25 ft.lbs. (31-34 N-m). Return vehicle to customer for trial period (estimated 1,000 miles). If oil consumption continues, proceed to Step 3.
3. Remove rocker arm covers and replace all intake and exhaust valve stem seals. Refer to the following application chart for the correct valve stem seals.
Service Part Engine Service Part
Description Application Number
Intake Valve Seals 5.0L E43Z-6571-A
Exhaust Valve Seals 5.0L D90Z-6571-A
Exhaust Valve Seals 5.0L H.O. E2ZZ-6571-A
Figure 12 - Article 87-7-12:
Refer to appropriate Shop Manual, Section 21-21, for installing exhaust valve stem oil seals and refer to instructions in tool kit, T87L-6571-BH, for installing intake valve guide mounted seals. Valve guide, mounted intake valve seals and nylon "umbrella" type exhaust valve seals are used on these engines. The intake seals must be fully seated onto the guides without being cocked. The exhaust seals should be attached to ride along with the valve stem. See Figure 12.
Figure 13 - Article 87-7-12:
NOTE: On passenger car engines, a nylon disk on the intake valve is used as an engine assembly aid and serves no useful function. Remove and throw away nylon discs, Figure 13.
PART NUMBER PART NAME CLASS
E6SZ-9424-A Intake Manifold C
Assembly
D90Z-6571-A Exhaust Valve Seal AM
E2ZZ-6571-A Exhaust Valve Seal - RM
5.0L H.O.
E43Z-6571-A Intake Valve Seal A
D7AZ-19B508-A Contact Adhesive A
OTHER APPLICABLE ARTICLES: 86-20-4, 86-11-16
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
Operation
Description Time Application
Number
SP870712A Step 1 0.2 Hr. All
SP870712B Step 2 2.4 Hrs. Ford/Mercury, Lincoln
2.7 Hrs. Mustang/Capri, LTD
Thunderbird/Cougar,
Mark VII, Continental
SP870712C Step 2a 0.2 Hr. All (Cars Only)
SP870712D Step 3 4.3 Hrs. Mustang/Capri, LTD
Thunderbird/Cougar,
Mark VII, Continental
4.4 Hrs. F Series
4.5 Hrs. Ford/Mercury, Lincoln
5.3 Hrs. Econoline
DLR. CODING: Basic Part No. 6009 - Code: 40