Fiat Tipo timing belt change.

[DIYspanner]

2019 reg 356 1.4, 843A1000 code

Since its @ 48k miles and the recommended change is 54k miles, I need to prepare to do the change.

Can any Tipo experts quote the torques and special tools needed please?

Will likely fit a Gates belt kit. I've had Gates part no KP15503XS-2 quoted to me.

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[Mottie]

Don't think I've ever bothered with torquing up bolts on a little job like that. Just nip 'em up and then a little bit more.

 

[Avocet]

People do get hung-up on tightening torques these days. It's a good idea, obviously, but it's not an exact science. I tend to torque joints where a gasket is involved, to try and get an even clamping force on the gasket, and I tend to torque small, fine-threaded cycle fasteners because they're otherwise so easy to strip, but wouldn't be too bothered about any of the fasteners on a cam belt job.

Have you come across this crowd?

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I used to be on there a lot when my daughter had a Punto, and there are some friendly and knowledgable folk on there. The "EPER" is very good for checking part numbers too.

 

[DIYspanner]

For the water pump, I'd say 5Nm since that's was official for the water pump when I did my Bora TDI belt change.

I inquired on the Forum website so perhaps I'll get feedback.

Also need to establish if the shafts need to be locked before the belt comes off. Its a single cam so not too complex.

Regarding torques, all the tyre centres torque wheel nuts for liability reasons but that's a another story.

 

[Avocet]

For the water pump, I'd say 5Nm since that's was official for the water pump when I did my Bora TDI belt change.

Do you know the thread size and pitch? There are standard tables online for recommended torques for threaded fasteners. If the water pump bolts are (say) M6 x 1.0, 5Nm would seem a bit low? Depends on how much thread engagement you have though.

I inquired on the Forum website so perhaps I'll get feedback.

Also need to establish if the shafts need to be locked before the belt comes off. Its a single cam so not too complex.

Regarding torques, all the tyre centres torque wheel nuts liability reasons but that's a another story.

Yes, we have to specify fastener torques for everything on the line, for exactly the same reasons. You can use lower-skilled staff if you do that, but in reality +/- 25% on a wheel nut / bolt, isn't going to make any real difference.

 

[DIYspanner]

Then VW come along with their stretch volts so its torque + 90°.

Anyone read the official tightening sequence for the drive shaft nut on a Bora TDI?

 

[Avocet]

That's why tightening to a torque isn't an exact science. When you pull on the torque wrench, you have no idea how much of that torque is overcoming friction in the threads, or between the underside of the fastener and its washer, or a bit of swarf down the hole, or whatever. The values are quoted for new (usually plated, sometimes lightly oiled) fasteners. The minute you work with an old, rusty one, or you put some Copperslip on the threads, the manufacturer's original figure goes out of the window! Even without torque-to-yield ("stretch bolts"), manufacturers are increasingly just quoting a relatively small "seating torque", plus an additional angle to turn the fastener through to arrive at the right clamping force.

Stretch bolts take it to a new level, exploiting that peculiar "double yield" point that steel has. They give a much more consistent clamping force than a conventional bolt. (...But of course, you need new bolts each time then)!

 

[DIYspanner]

Regarding the water pump, I presume its replaced it as with VWs when fitting a new timing belt.

The Gates belt kit includes the pump whereas the Ina offering is only the belt and tensioner, the pump being a separate offering.

 

[DIYspanner]

If of interest, a YT video for a similar belt change quotes these torques.