Turbocharger - Diagnostic Procedure

84ford4

Article No. 84-22-4


TURBOCHARGER - DIAGNOSTIC PROCEDURE


FORD 1983-1/2-84 T-BIRD, MUSTANG, MUSTANG SVO

LINCOLN-MERCURY 1983-1/2-84 COUGAR, CAPRI

The following procedure should be used to diagnose the turbocharger for customer reports of Excessive Whine or Oil Consumption.

EXCESSIVE WHINE

Turbochargers will exhibit some normal audible whine and should be evaluated to determine if the noise level is normal or excessive.

FIGURE 7:

Remove the turbocharger air inlet casting from the compressor housing and rotate the compressor wheel and shaft assembly by hand (Figure 7).

NOTE: If the radial movement seems excessive, measure movement per the service manual (Section 24-45 - Turbocharger).
OIL CONSUMPTION

Check all four spark plugs: If all are oily, the wrong crankcase vent tube connection may be the cause (see TSB 84-6-18 or 2.3L EFI and 84-20-9 SVO only), or the turbo compressor face seal may be defective.

FIGURE 8:

If the spark plugs are dry, drop the exhaust pipe from the turbocharger flange (Figure 8). If the exhaust elbow on the turbocharger or the tail pipe is saturated with oil, the turbine ring seal is the cause, replace the turbocharger.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"