Chains

There are three chains in the engine:

• One primary chain from a sprocket pressed onto the crankshaft to the intermediate shaft (jackshaft)
• Two secondary (upper) chains from jackshaft to camshafts

Chain Dimensions

Chain Type

• Both chains are 3/8 pitch double-row (ISO 06B-2) automotive quality.

Primary Chain

• 74 links -> 29.750" long continuous.

Secondary Chain

• 102 links -> 38.50" long with split link.
  • (each)

Vendors

• Renold
  • Formerly known as "BRAMPTON"
    • Chains marked this way are likely NOS and should not be fitted as they are early technology
  • "Synergy" is their state-of-the-art version chain (but is NOT) automotive quality.
    • It will serve if you are unable to find automotive quality.
• "IWIS"
  • As used on 1991 Mercedes 420 SEL

• Chains are still supplied by SM Club de France in the more recent but NOT latest technology.

See Also

• Chain Replacement
• Primary Chain Tensioner
• Primary Chain Oil Spray