Beretta L4-138 2.3L DOHC QUAD 4 (1991)
3.
For 1990 model vehicles, inspect timing chain tensioner shoe. If timing chain has worn grooves into tensioner shoe in excess of 1.14 mm (0.045
in.) deep replace tensioner shoe and stud (see Figure 1).
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
24570356 to replace the parts. Store the tensioner assembly until it is needed for assembly in a location where dirt will not get into the oil holes.
DO NOT USE ANY CLEANING MATERIAL OR METHOD THAT WILL REMOVE METAL FROM THE PLUNGER OR BORE.
6.
Inspect cylinder head bolts for damaged threads or for damaged bolt heads caused by improper use of tools. Replace head bolts as appropriate.
