Technical Cambelt rotation

[mrbenno]

Hi Guys,

Thanks to the wealth of information on the Forum and much use of the search function, I have taken the head off my Cinq Sporting to replace the head gasket (and water pump, cam belt and thermostat while I'm at it). All has gone well so far. I'm getting it skimmed tomorrow and having the valves reset.

Thanks so much to all that have taken time to make the guides.

I have some basic questions that I can't find answers to via the search:

1. Does anyone know the direction of the cambelt and rotation of the crank and camshaft pulleys if I'm looking at the pulley from the drivers side through the wheel arch?

2. Are there any photos or good descriptions of the throttle body with ref to where all the electric connectors go? I completely forgot to label them all up before I removed them.

3. I have removed the tube from the inlet manifold to the brakes at the brakes end. Do the brakes need to be bled after reconnecting the pipe?

Many thanks in advance.

Cheers,

Ben

 

[ycming]

1) clock wise, so it the spining action moves towards the front of the engine
2) Assuming is a SPI, here it is

https://www.fiatforum.com/cinquecento-seicento-guides/146381-spi-throttle-body-where-pipes-go.html

3) no need at all
Ming

 

[mrbenno]

Thanks Ming. I hope putting it all back together is as easy as taking it apart!

I might be back...

Cheers,

Ben

 

[rallycinq]

You can't get the wiring of the TB wrong, all the plugs are a unique shape/colour.

If it doesn't go into the connector easily, its the wrong plug.

I presume you mean you have taken the servo hose out of the servo, no bleeding neccessary.

Cheers

SPD

 

[mrbenno]

Thanks for the replies.

SPD

The hose went from the inlet manifold to the vacuum servo and had an internally ridged yellow pull off connector a bit like a garden tap. In 'Cinquecentos for Dummies' language what does it do?

One more question...

Mr Haynes Manual seems to say that the FIRE 1108cc is an interference engine. Other posts here say otherwise. Who do I believe?

Cheers,

Ben

 

[ycming]

non-contact engine

 

[rallycinq]

The hose you describe is the vacuum hose from the servo. The vacuum in the inlet manifold sooks the servo, lucky servo.

Cheers

SPD

 

[mrbenno]

Head is back on the car. Just put the new cambelt on. All lined up top and bottom. Tensioned the tensioner.

We turned the engine on the crank. Here's the question:

Will the lines on the belt come around and line up again or does it not matter?

Are the marks on the pulleys and the engine all that need to line up after a few revolutions?

Also:

Haynes Manual says get FIAT to check the tension. None of the guides on FF that feature the cambelt mention taking it to FIAT to get it checked. What to do?

I eagerly await expert answers.

Thanks,

Ben

 

[beau]

you dont need to get them to check it.

 

[ycming]

From rally cinq, on the longest stretch there should one 1 inch of deflection.

Also, if you turn the bottom pulley twice, then the 2 lines on the belt should up with the timing mark on the engine.



Ming

 

[mrbenno]

Which is the longest stretch?

So... If I turn the crank twice then the belt marks should be back to the same place exactly?

Thanks again.

Cheers,

Ben

 

[rallycinq]

Yes, exactly. The timing of the engine is critical. The longest stretch is the longest length between pulleys.

Another way of checking the tension is to twist the belyt. It should go 90 degrees, no more.

Cheers

SPD

 

[mrbenno]

Hi,

I have fitted the cambelt. Tensioned up and did the deflection and the twist 90 degrees tests. I got the lines and the notches all lined up. Gave the crank 2 turns and the pulley notches both lined up perfectly. The belt lines don't line up again.

I reconnected everything except the alternator filled up the coolant and oil and bit the bullet and started the engine up. It ran perfectly.

Are the belt marks just there for the initial installation of the belt and irrelevant after that? I'm confused.

Any top tips for tensioning the alternator and getting to the top bolt? My dad harped on about a special spanner. I had a quick google and discovered obstruction spanners and half moon bent spanners. Noticed that one of the guides featuring the alternator mentioned a ball allen key.

Thanks again,

Ben

 

[beau]

yeah the lines on the belt are just to help with fitting, after its been ran they will be anywhere.

 

[rallycinq]

In the old days, belts didn't have marks on them, you relied purely on the timing marks on the engine.

Tensioning the alternator is best done with a crowbar. Do not overtighten or the bearings will be damaged.

Cheers

SPD

 

[mrbenno]

The belt I took off before replacing the head gasket just had an arrow for rotation.

Thanks so much to the guide writers and all who have given advice in this thread.

I have changed a head gasket all on my own. Yay!

Cheers,

Ben

 

[ycming]

yeah the lines on the belt are just to help with fitting, after its been ran they will be anywhere.

if you line up the white lines on the belt and the timing mark before u fitted them. It will line up again.

But it doesn't really matterm as lnog as it keeps going back to the right place

Ming