Technical Cambelt Change on Grande Punto 1.4 Tjet

[AdamST205]

Hello I have just bought a Grande Punto Tjet for my daughter as a first car but it is a bit of a project and has very little history so first port of call is to change the cam belt. I have downloaded eLearn but the procedure for changing the belt is completely different to the video's on youtube I have watched.

eLEARN wants you to use pins in the spark plugs to align the pistons to the half way point where most of the video's I have watched you lock the crank shaft with a plate and screws? Also undoing the cam shaft sprocket do you need a special tool to do this or are the locking pins strong enough to take the pressure of undoing the cam sprocket bolt and also retorquing it?

This is the set I have bought.

Pardon our interruption...

ToolHub 9847

Does anyone have a definitive guide on how to do these. I have done plenty of belts and chains but mostly Japanese cars which have timing marks whereas this engine seems to have zero and the cams are inside the engine so just do not want to mess it up and then be scratching my head trying to get it all back in time.

 

[GrandePunto PL]

First of all, take your time and study classic 16V (non-turbo) timing belt procedures/tools (it's the same thing mostly). Then T-Jet.
https://aftersales.fiat.com/elearns...ocedure&validityName=1.4 16v TJet&isExaminer=
Procedures are NOT there to babysit the mechanic and tell each and every step in detail, explain things (like holding/locking parts during undoing the bolts etc.).
Some locking tools are too weak, some not (to help you torque the bolts). You must know (feel) this from experience.

There are also universal tools to hold the cam sprockets, lever type. But it can mess-up the timing.
Example (don't know if it fits any Fiat): https://gm-tools.eu/225,universal-camshaft-pulley-locking-tool-set.html
https://eshop.ntn-snr.com/en/product/OM3678-CLA/UNIVERSAL-CAMSHAFT-BELT-PULLEY-LOCKING-LEVER-TOOL

 

[AdamST205]

Yeah i pretty much get it now. Have ordered a tool to hold the cam pulley.

The way I see it in simple terms.

1) align cams with locking tools in head.
2) apply locking tool to crank pulley after removing aux belt pulley.
3) loosen cam pulley and then belt tensioner
4) remove belt
5) put new water pump and belt on.
6) align belt tensioner
7) torque up cam sprocket
8) remove all the gear and then do two rotations of engine then reattach everything to make sure in time.

From what I have read from the procedures is I do not need to remove plugs and use height sticks to see the alignment of the cylinders because of the cam locking tool included in the kit which isn't in the Fiat procedure. I presume this was a modification done at a later date to make belt changes easier.

 

[AdamST205]

I ended up removing the two spark plugs closest to the timing belt as well and putting in the piston height sticks. It made it a hell of a lot easier to get the cam locking tool in as I could see the right place to turn the crank.

I only used one locking tool for the cams as to put one in the other side would require removal of the turbo but seeing as the cams are geared I am sure this is more than fine. The cam locking tool that I used also required removal of the injector plug and moving the loom to allow room to get the locking pin into the hole but wasn't too bad in the end. Just a few more bits to undo.

Took me about 5 hours to do all together although I was cleaning and double checking everything I was doing. I also put a new aux belt and tensioner on too. I am sure I could do another one a lot quicker now I know all the torque settings etc.

I did notice a blanking plate was leaking a little oil next to the cam sprocket so put a new O-ring in and sealed it up for good measure. Not sure how common this is. Camshaft and Crankshaft seal were fine however so left them alone.

 

[Dan1818]

I ended up removing the two spark plugs closest to the timing belt as well and putting in the piston height sticks. It made it a hell of a lot easier to get the cam locking tool in as I could see the right place to turn the crank.

I only used one locking tool for the cams as to put one in the other side would require removal of the turbo but seeing as the cams are geared I am sure this is more than fine. The cam locking tool that I used also required removal of the injector plug and moving the loom to allow room to get the locking pin into the hole but wasn't too bad in the end. Just a few more bits to undo.

Took me about 5 hours to do all together although I was cleaning and double checking everything I was doing. I also put a new aux belt and tensioner on too. I am sure I could do another one a lot quicker now I know all the torque settings etc.

I did notice a blanking plate was leaking a little oil next to the cam sprocket so put a new O-ring in and sealed it up for good measure. Not sure how common this is. Camshaft and Crankshaft seal were fine however so left them alone.

Hi mate doing the cambelt on my punto t-jet currently, just wondering what the torque specs are for the camshaft pulley is?

 

[AdamST205]

Hi mate doing the cambelt on my punto t-jet currently, just wondering what the torque specs are for the camshaft pulley is?

120nm iirc. There is a video on YouTube. Search Alfa 1.4 Tjet cambelt. It is with an Irish guy. He goes through pretty much everything. You need a tool however to take up the slack of torquing it up though.

 

[Dan1818]

120nm iirc. There is a video on YouTube. Search Alfa 1.4 Tjet cambelt. It is with an Irish guy. He goes through pretty much everything. You need a tool however to take up the slack of torquing it up though.

Thanks for the reply, and yes I’ve got a laser camshaft holding tool. I will give this a go tonight and hopefully all goes well.