Engine - Metallic Rapping Noise When Cold: Overview

Article No.
95-7-3

04/10/95

^ METALLIC "RAPPING" NOISE - 4.6L ENGINE - DURING COLD ENGINE START-UP - ENGINES BUILT BEFORE 10/7/93

^ ENGINE - 4.6L - METALLIC "RAPPING" NOISE FROM ENGINE DURING COLD START-UP - ENGINES BUILT BEFORE 10/7/93

LINCOLN-MERCURY:
1993-94 MARK VIII

This TSB is being republished in its entirety to include the latest level parts and to update the Service Procedure.

ISSUE:
Some vehicles may exhibit a brief metallic "rapping" noise from 2 to 5 seconds after starting the engine. The noise may be caused by low secondary cam chain tension during start-up, due to bleed down of the hydraulic secondary cam chain tensioner.

ACTION:
Install improved design secondary cam chain tensioners in engine. Refer to the following procedure for service details.





NOTE:
THE REPLACEMENT OF THE SECONDARY CAM CHAIN TENSIONERS REQUIRES THE SPECIAL TOOLS:





NOTE:
A WOODEN WEDGE MUST BE MADE TO HOLD THE PRIMARY TIMING CHAIN IN POSITION. REFER TO FIGURE 14 FOR DIMENSIONS.

CAUTION:
THE REPLACEMENT OF THE SECONDARY TENSIONERS CANNOT BE DONE WITHOUT THESE TOOLS. FAILURE TO USE THE SPECIAL TOOLS WILL RESULT IN SEVERE DAMAGE TO THE ENGINE.

OTHER APPLICABLE ARTICLES: 93-23-14
SUPERSEDES: 94-17-4
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME
950703A Replace Tensioners 11.0
Hrs.

DEALER CODING
BASIC PART NO. CONDITION CODE
6k254 1C04

OASIS CODES: 497000, 499000, 702000, 702100