WSM question.

Hello

I came across this procedure In the 456GT timing belt section that confused me.

Its about rotating counterclockwise, without coming back.

Do they mean slightly near the TDC or a full revolution?

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Prit, for the sake of correct translation if you can submite a picture of full page so we can compare to Italian ducument.
I can read partially that it is counterclockwise. I am not aware of counter clockwise rotation But again I can be wrong.

 

There is a problem with the translation of that procedure in the manual. You never want to turn the crankshaft counter-clockwise (backwards of normal engine rotatation) when checking the tension of the cam belts or performing the tensioning procedure. In order to check the tension of the belts rotate the engine over clockwise until it is at TDC on cylinder #1 on the compression stroke (PM1/6). This is when all of the timing marks on the cams/cam sprockets should line up.
This is also when you check the tension of the cam belts. You check the values of the belt tension on both runs of each belt with the Staeger gauge and add the values together to come up with the spec of 135.

 

Many thanks. I will take another pic of the procedure.

A mechanic helper did turn the crank slightly
Counterclockwise Which I luckily stopped it at around 60 degrees.

I have started the engine and everything seems normal Thank God

 

Brian- Does Staeger make a system for measuring frequency? I thought the Staeger measured depression.

 

Hey not sure If this is the tool or whether it’s calibration is for Ferrari.

There is one for sale on ebay.
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That is not what you want. You want a tool designed to measure the frequency of the vibrations of the timing belts when struck with a screwdriver or other tool. Here is the latest version of that from the 612 WSM. The 456-612 use (with upgrades) the same tensioners and belts so this procedure works for all of them.


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Hey Happy new year all


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That is from a procedure written in 1993 or 1994. Ferrari has learned a few tricks since then. Just like it makes no sense looking for 25 year old lubricants called for in the OM. The one from the 612 WSM is the most current for timing belt tension. If you want to buy a tool and do not want to use your smart phone, here is a tool that works as well as the factory tensiometer for about $250.

 

Many thanks for the clarification. I must of lost 25 percent of my hair in the last month.

I spoke to a few specialist near me and I do want them to tension the belts using some tool in line with the new procedure.

This is how the old tesnioner was sitting when I took off the cover to change a waterpump!
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Yes, the Staeger gauge is old tech and measures belt tension using spring pressure causing depression of the belt.

The newer tensioning method using belt frequency is far more accurate. Your method is the proper one, and now you can purchase a belt frequency meter for much less than a Staeger gauge:
https://www.pelicanparts.com/More_Info/00072192010.htm?pn=000-721-920-10-OEM&gclid=EAIaIQobChMItu6bq8bN3wIVBsNkCh3iUQ2FEAQYASABEgK4APD_BwE

 

Great clarification thank you. I it best to leave in spark plugs when rotating the engine with the tensioner bolt loose?
I did try this and the tensioner really floats! Its a bit daunting when the compression builds up.

 

It is best to set the belt tension with the spark plugs removed. You cannot rotate the crankshaft smoothly due to the increase in force required to turn it as each cylinder comes up on its compression stroke. This causes the belt tension to change.

 

Prit, I looked at all four languages and the content are all same counterclockwise, the principle is always same and never changes and is clockwise. I can not tell exactly where the root of this mistake came from but Europeans usually speaks 2-3 different languages .. Regarding tensioning the belt their are verity of tools plus your own fingers can tell the setting. There is one semi confusion between experts , the manual says make few rotation and check the tension, never says stop at TDC and then check the tension. I like to see the TDC phrase in WSM if some body can direct me.
Good luck and happy new year to you too.

 

Greetings

Really appreciate all your valuable advice. My small one year project hopefully will be complete now. Car Is running lovely.

I am now confident enough to do the job myself. However for the peice mind I am going to have the belts done professionally by someone who has done many of these before.

Many thanks
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