M115 timing chain rattle on cold startup

The M115 simplex timing chain stretches causing a rattle on cold startup that quietens as oil pressure builds. Long term, stretched chain affects valve timing and performance.

• Chain rattle on cold startup lasting several seconds
• slightly rough idle when cold
• gradual power loss

• Stretched timing chain
• worn chain tensioner
• worn timing sprockets

Listen for rattle on cold start. Check timing with light — if marks are significantly retarded despite correct distributor setting, chain stretch is likely.

Replace timing chain, tensioner, and guides as complete set.

M115 timing chain set — chain, tensioner, guides, sprockets