Timing belt walk

shadowman1977

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#1
Hey all, got my Supra running a few days ago after a ground up rebuild.
I have a modified timing cover and noticed that the belt is walking slightly forwards on the tensioner pulley, about 1/16”.
Is this normal or should I worry? The belt is right in the middle on the timing gears.
Any incite would be much appreciated.
 

cinderMK3

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#5
Possibly meant the Guide Ring on the crank pulley. the ring tacks have been known to pop and it allows the belt to walk.
 

hvyman

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#8
As long as the belt is not riding off of the pulley your fine. The belt will walk where it wants to depending on rpm.
 

shadowman1977

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#9
As long as the belt is not riding off of the pulley your fine. The belt will walk where it wants to depending on rpm.
Ok, It doesn’t move too much with RPM change. Just noticed it looked a little more forward than the other pulleys and I found it hard to follow the repair guides belt flexion measurement instructions
 
Last edited:

figgie

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#10
Shawdowman,

if you got this addressed great.

If it does happen that the timing belt is moving all over the place

verify the proper torque on the bolt that holds the cam in place to the oil pump.

I had an incident that the bot sheared so the pulley was wobbling and the timing belt was walking with it.