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Has anyone had a timing belt break?

 
Old 10-11-18, 03:44 PM
  #76  
cdnewton
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Originally Posted by Koolaid54 View Post
the 3.3 is a non interference fit motor. so even if the belt snaps your engine is fine.
This has been posted before by moderator salimshah: Lexus Variable valve engines (i.e. the 3.3L VVTi) are interfering and depending on circumstances (relative position of piston and valves as controlled by VVTi) you may or may-not be in interference mode.

The bottom line: you may get lucky and not do any damage, then again, you may be in for an expensive repair.

Last edited by cdnewton; 10-11-18 at 04:04 PM.
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Old 10-12-18, 08:06 AM
  #77  
Koolaid54
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Originally Posted by cdnewton View Post
This has been posted before by moderator salimshah: Lexus Variable valve engines (i.e. the 3.3L VVTi) are interfering and depending on circumstances (relative position of piston and valves as controlled by VVTi) you may or may-not be in interference mode.

The bottom line: you may get lucky and not do any damage, then again, you may be in for an expensive repair.
There is no such term in the automotive world called non-Interference mode in engines. Non interference means when either intake or exhaust valves are fully open and the piston is DTC. At no point will the valve head be in any position to where the piston head can be.

As for VVTI causing it. It's not going to happen.
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Old 03-21-19, 02:36 PM
  #78  
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I'm adding to this because of a recent timing belt change: the belt looked ok, but bearings in one of the pulleys/tensioners was starting to go. That failure can still cause damage even if the belt is ok, so don't only focus on it.
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