know of a zed for sale with broken engine( timing belt snapped) supposedly at low speed could anyone give pointer to what possible damage may of occurred to see if its worth buying

cheers :rolleyes:

Have replaced a least half a dozen broken timing belts each one was at low speed roughly up to 30mph and some at tick over and all were auto`s ( drive disconnects instantly after engine stops) and everyone was NOT damaged, a new belt sorted them out.

 

Having said that, you never know if you are getting the real story, if it is badly damaged then could be in for a major rebuild, it still maybe worth a punt if the car is priced right, you can always break it to recoup your money.

 

Jeff TT

know of a zed for sale with broken engine( timing belt snapped) supposedly at low speed could anyone give pointer to what possible damage may of occurred to see if its worth buying

cheers :rolleyes:

 

 

depends how soon the person driving stopped and what speed more than likely bent valves but the engine will need stripping down anyhow also may need new heads :( depends how much your paying

as a newbee its 1992 t/t auto any idea of its worth

as a newbee its a 1992 t/t auto what would you pay?

Mine went on ebay with a knackered bottom end for £1300. Nice alloys, recon gearbox.1989 one in good nick other than engine

How does drive disengage? I mean the bottom end and top end still have momentum. So surely valves will touch regardless of whether the engine is stuck in gear or not.

 

Sorry, just wondering. :)

Quoted by FunkySI "How does drive disengage? "

 

Good question! easily explained, the drive in an auto box is derived from the torgue convertor changing the fluid pressure into driving force, the fluid pump is driven at the front of the box from the engines rotation.

 

So engine stops, pump stops, drive stops, by this I mean the spinning rear axle cannot drive the engine through the box like on a manual.

 

This is why an auto box is less likely to cause less damage when a timing belt breaks, as well as the momentum of the car not driving the engine there is less ( well non ) chance of the driver attempting to bump start the engine ( in case they thought it had stalled.

 

As far as the engine is concerned it will continue to rotate a little but with it not firing it will stop very quickly.

 

The explainaion of the gearbox function is for illustration only not the exact way it works.

 

Jeff TT

Thanks Jeff.

Quoted by FunkySI "How does drive disengage? "

 

Good question! easily explained, the drive in an auto box is derived from the torgue convertor changing the fluid pressure into driving force, the fluid pump is driven at the front of the box from the engines rotation.

 

So engine stops, pump stops, drive stops, by this I mean the spinning rear axle cannot drive the engine through the box like on a manual.

 

This is why an auto box is less likely to cause less damage when a timing belt breaks, as well as the momentum of the car not driving the engine there is less ( well non ) chance of the driver attempting to bump start the engine ( in case they thought it had stalled.

 

As far as the engine is concerned it will continue to rotate a little but with it not firing it will stop very quickly.

 

The explainaion of the gearbox function is for illustration only not the exact way it works.

 

Jeff TT

 

I could be wrong but on my old toyota celeca auto i could switch the engine off while rolling down a hill in drive and it would still be turning the engine over, as when you turned on the key it would bump start.