Subject: | Grind and/or Rattle Noise from Engine Front Cover Area (Replace Timing Chain Assembly, Tensioner and Guides) |
Models: | 1993 Saturns built between and including VINs PZ233317 to PZ293164, equipped with DOHC (LLO) and SOHC (LKO) engines. |
Some customers may comment about a grind and/or rattle noise coming from the engine compartment under all operating conditions. The noise is more evident near the engine front cover with the hood open.
On these vehicles, the oil bleed hole on the timing chain tensioner assembly was increased from 1 mm to 1.6 mm. The increased bleed hole size may cause the timing chain tensioner assembly plunger to seize and/or stick in the timing chain tensioner assembly plunger bore. This may cause premature wear of the timing chain assembly and timing chain guides, causing a grind and/or rattle noise.
Important: The illustration on the next page shows the difference between the 1 mm and 1.6 mm oil bleed hole.
Perform the following procedure to repair the condition
If the timing chain assembly is not tight against the upper timing chain guide, replace the timing chain assembly, timing chain tensioner assembly and three timing chain guides, (Refer to "Front Cover - in - Chassis" procedure in the "1991 - 1994 Engine Mechanical Service Manual.")
If the timing chain assembly is tight against the upper timing chain guide, refer to the appropriate diagnosis in the "1991 - 1994 Engine Mechanical Service Manual."
If the timing chain assembly is not tight around the camshaft sprocket, replace the timing chain assembly, timing chain tensioner assembly and two timing chain guides. (Refer to "Front Cover - In - Chassis" procedure in the "1991 - 1994 Engine Mechanical Service Manual.")
If the timing chain assembly is tight around the camshaft sprocket, refer to the appropriate diagnosis in the "1991 - 1994 Engine Mechanical Service Manual."
DOHC (LLO) ENGINE | |
21000336 | Chain Asm - Tmg |
21000339 | Guide - Tmg Chain |
21006035 | Guide - Tmg Chain |
21006435 | Guide - Tmg Chain |
SOHC (LKO) ENGINE | |
21000096 | Chain Asm - Tmg |
21000099 | Guide - Tmg Chain |
21006498 | Guide - Tmg Chain |
DOHC (LLO) AND SOHC (LKO) ENGINES | |
21006504 | Tensioner Asm - Tmg Chain |
To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System as follows:
Case Type | Description | Labor Operation Code | Time |
VW | Replace Timing Chain, Timing | T9665 | 3.9 hrs |
Chain Guides and Timing | |||
Chain Tensioner | |||
Assembly -- DOHC (LLO) | |||
Engines | |||
Add: | |||
To replace camshaft cover gasket, if necessary | 0.5 hrs | ||
VW | Replace Timing Chain, Timing | T9665 | 3.6 hrs |
Add: | |||
With P/S | 0.3 hrs | ||
To replace rocker cover gasket, if necessary | 0.3 hrs |