D50/Power Ram 50 L4-2300cc 2.3L DSL (1984)
Timing Chain Tensioner: Customer Interest
Engine - Metallic Knock/Noise on Start Up
Models
1983-1984 Conquest, Ram 50 With 2.6L Engine
Subject
Start Up Knock
Index
ENGINE
Date
July 22, 1985
No.
09-09-85
P-2599
SYMPTOM/CONDITION
Metallic noise or knock sound for 1-3 seconds after engine start up, on vehicles that have not been operated for a period of four hours or longer.
NOTE:
THIS START UP NOISE IS NOT DETRIMENTAL TO ENGINE RELIABILITY. HOWEVER, THE FOLLOWING REPAIR
CAN BE PERFORMED TO ELIMINATE THIS NOISE.
PARTS REQUIRED
1 Dampener
PN MD084945
REPAIR PROCEDURE
NOTE:
THE DAMPENER IS INSTALLED IN ALL ENGINES BUILT AFTER OCTOBER, 1984.
The start up knock is caused by the timing chain tensioner relaxing and expelling the engine oil from the tensioner oil pressure cavity. The rubber
dampener, PN MD084945, is placed inside the tensioner spring to prevent excessive chain relaxation and reduces the volume of oil required to fill the
tensioner cavity. The result is quicker oil pressurization and elimination of the start up knock.
1.
Using the appropriate service manual, disassemble the engine far enough to remove the timing chain tensioner and spring.
