SailNet Community - View Single Post - Perkins 4.154 Crank Pulley removal
View Single Post
  #11  
Old 01-25-2012
sea_hunter's Avatar
sea_hunter sea_hunter is offline
Senior Cruiser
 
Join Date: Jul 2000
Posts: 512
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 15
sea_hunter is on a distinguished road
Quote:
Originally Posted by SloopJonB View Post
Indeed I don't (it IS a brute though). I've never seen a serpentine system without a powerful spring loaded tensioner - the one on my wife's minivan requires a breaker bar to unload the tension. How is tension maintained on the belt on the system you describe?
Yes automotive serpentine belts require a loaded tensioner, the ones used on marine engines employing large case alternators do not. The belt goes around ALL the drive pulleys, but underneath the idler pulley. The tension is loaded with the alternator adjusting arm. The main reason it's done this way is that marine diesel engines don't operate at variable and higher engine RPMs (therefore no backlash that causes the belt to "jump") like automotive engines. Hope that helps.
Reply With Quote Share with Facebook