Focus Fanatics - View Single Post - Weird sound from engine
View Single Post
Old 11-11-2012, 11:33 PM   #5
jetrinka
Focus Fanatic
 
jetrinka's Avatar
 
Join Date: Mar 2007
Fan#: 45622
Location: Snohomish, WA
What I Drive: 88 5-speed XR4TI

Posts: 7,528
FF Reputation: 180 jetrinka Excellent Standing Memberjetrinka Excellent Standing Member
Buy-Sell-Trade Rating: (6)
Slack in a chain or belt won't affect cam timing as timing is dependent on the number of teeth in either the chain or belt, not the relative length or tautness. The relation between the cam and crank remains 2 revolutions of the crank to every 1 of the cams. However in extreme cases of say a tensioner completely failing it will cause the motor to run like crap purely because the crank accelerates and then there is a delay on when the cams turn because that slack must be taken up. Often the motor won't run at all.

If there is a bad tensioner in your car, it probably isn't affecting how the car runs, at least at this time. Hydraulic tensioners can tend to make knocking sounds if they are failing.
jetrinka is offline  
    Reply With Quote