Problem with gates racing timing belt
Aug 26, 2013, 07:37 AM
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Problem with gates racing timing belt
This belt is on my 2.4 in my 05 evo with just over 500 miles. The belt is fraying on the sides on the whole belt(side away from the block) and of course the huge chunk of the belt that's broken off. Has anyone seen what could cause this or could the belt be defective?
Aug 26, 2013, 08:07 AM
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How was the gasket for the lower timing belt cover, when you replaced the belt? Very common for them to deteriorate to the point of just flattening or breaking apart over the years, especially when they get oils and other fluids on them. After that, it's pretty easy to over tighten the cover down, which could absolutely cause that sort of wear.
Might want to spin the engine by hand with a big ½ inch ratchet and short extension, and listen for any obvious signs of rubbing.
Might want to spin the engine by hand with a big ½ inch ratchet and short extension, and listen for any obvious signs of rubbing.
Aug 26, 2013, 10:47 AM
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How was the gasket for the lower timing belt cover, when you replaced the belt? Very common for them to deteriorate to the point of just flattening or breaking apart over the years, especially when they get oils and other fluids on them. After that, it's pretty easy to over tighten the cover down, which could absolutely cause that sort of wear.
Might want to spin the engine by hand with a big ½ inch ratchet and short extension, and listen for any obvious signs of rubbing.
Might want to spin the engine by hand with a big ½ inch ratchet and short extension, and listen for any obvious signs of rubbing.
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Aug 26, 2013, 10:47 PM
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the wear indicates that the belt is slipping off of the cam a bit. the part that is worn, you can see where the belt is further forward of the cam teeth, as opposed to the back cam gear. sorta like it "walked" a little. I would look into why the belt is doing that. I usually see about a 1/16th to an 1/8th" of cam teeth on the gears before the belt. I could be wrong. good luck. I've seen that on fin fans for cooling towers, and the cause usually is gear misalignment.
Last edited by heavens turbo; Aug 26, 2013 at 10:51 PM.
Nov 6, 2013, 10:02 PM
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I've seen this happen (not on 4G63/4, but on other engines) when a bolt that holds the idler pulley (or a bolt holding the tensioner pulley) is bent. This causes pulley to be at a slight angle, and the belt to walk one way or another.
Those bolts bend pretty easily when they are taken off (or put on) an engine with a breaker bar (which puts lateral load on the bolt) As opposed to using a impact gun Or a T-handle wrench, which puts a rotational load only.
Those bolts bend pretty easily when they are taken off (or put on) an engine with a breaker bar (which puts lateral load on the bolt) As opposed to using a impact gun Or a T-handle wrench, which puts a rotational load only.
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