Cutlass L4-138 2.3L VIN A FI HP (1990)
3.
Inspect the timing chain tensioner shoe, refer to Figure 1.
IMPORTANT:
On 1988 and earlier vehicles, also check the thickness of the backing plate. If the thickness is 2 mm (0.079 in.), replace the tensioner shoe and stud
with GM Kit Part No. 12340864. The new tensioner shoe backing plate will be 3.7 mm (0.146 in.) thick, refer to Figure 1. GM P/N 24570357 will
be an updated chain with smooth edges that will reduce tensioner shoe wear.
4.
If the tensioner shoe is broken and the chain is worn from contacting the metal surface, use GM kit P/N 12340864 to replace the tensioner shoe
and stud, P/N 24570357 to replace the chain and P/N 24570356 to replace the tensioner.
5.
Disassemble, clean and inspect the tensioner assembly. Be sure to pay special attention to the oil feed and drain holes, refer to Figure 2. Make sure
the oil holes are free of dirt so they will allow proper oil flow. If there is varnish in the tensioner bore or on the plunger that may cause the plunger
to stick in the bore, LIGHTLY polish the plunger or bore with SCOTCH BRITE or equivalent. Do not use any other method or technique to clean
the plunger or bore. Smooth surfaces will ensure the plunger will not stick in the bore. If the plunger still does not operate smoothly use GM P/N
