imp
Explorer Addict
- Joined
- November 12, 2009
- Messages
- 4,798
- Reaction score
- 779
- Year, Model & Trim Level
- 59 Ranchero F250 D'Line
Does 4.6L use a hydraulically actuated tensioner like 4.0L? Where is it? If yes, wouldn't slack be present on coast side of chain when engine off? That was one of the first questions at the beginning. No tensioning is needed on "drive" side of chain, as it's pulling like hell against valve springs. "Coast" side reflects slack left in chain. Slack increases with time as all those pins in holes wear, effectively making chain longer, therefore looser. So, a hydraulic "tensioner" pushing the "looseness" in the chain against some form of backing, removes possibility of chain "whip", and rattling noise.
Chains get the job done. They wear out. They get longer when they wear out. Time was, to test a worn timing chain, you laid it out on it's side, held at one end, if it formed a curve, it was shot. What bullshit! I saw brand new chains lay over in a curve!
Anyhow, gears are better. OHC diesels use them. Trying in vain to find pics of Cat 500 HP truck eng., experimental then, in our dyno lab. Used a big gear train. Amazing engine, ca. 1967. imp
Chains get the job done. They wear out. They get longer when they wear out. Time was, to test a worn timing chain, you laid it out on it's side, held at one end, if it formed a curve, it was shot. What bullshit! I saw brand new chains lay over in a curve!
Anyhow, gears are better. OHC diesels use them. Trying in vain to find pics of Cat 500 HP truck eng., experimental then, in our dyno lab. Used a big gear train. Amazing engine, ca. 1967. imp