Fiat Coupe Forum Fiat Coupe Forum
- Founded by Kayjey & James Northam - Funded by the Club for the benefit of all owners -
mixed RSS feedall RSS feeds
(this will scroll you to the RSS box)
Fiat Coupe Club UK
join the club
Fiat Coupe Forum
 
» Announced
    Old Forum BACK!
    Forum RSS feed!
    Images - finally!


» Related sites
    www.fiatcoupeclub.org
    www.fiatcoupe.net


» External data
    chatroom
    owners
 
Who's Online
1 registered (1 invisible), 64 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
2,607 Registered Members
65 Forums
108,871 Topics
1,295,482 Posts

Most users ever online: 546 @ 30/08/2007 19:16
Top Posters
stan 32079
barnacle 31764
Theresa 22716
bockers 20994
pinin_prestatyn 19865
PeteP 18589
JimO 17908
Nigel 16870
Jim_Clennell 16223
Vickster 15915
RSS Feeds
Club Events
Club Information
Track Events
Rolling Road/RWYB
Social Events
Non-UK Events
Coupé Related Chat
Coupé Spotting
Coupé News/Press
Buying/Selling Advice
Insuring a Coupé
Basic FAQ's
How to Guides
Forum Issues
Technical Problems
General Maintenance
Styling
Tuning
Handling
ICE and Alarm
Coupés for Sale
Coupés Wanted
Parts for Sale
Parts Wanted
Group Buys
Business Forum
Other Vehicles for Sale/Wanted
Other Items for Sale/Wanted
Haggling/Offers
Ebay links
Other Cars
Other Websites
General Chat
Topic Options
#1605641 - 05/08/2017 23:22 Wrong torque in cambelt guides
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
Can't quite believe this has never been noticed before but maybe this will save someone else the nightmare of stripping the thread on the adjustable tensioner nut as I did earlier.

In Skinflints PDF guide (version 2) and also in this generic Fiat 20v engine cambelt guide:

http://download.fiat-bg.org/Books/Coupe/Fiat%20Coupe%20cambelts%2020v%20all%20models.pdf

it specifies the torque for the nut securing the adjustable tensioner as 50NM. This is double the 25NM specified in the coupe engine manual and is way too high for an M-8 nut.

The fixed tensioner bolt is also specified in the engine manual as 25NM, but is listed as 50NM in the PDF guide.

Just hope I haven't damaged the stud and that the nut is still available from Fiat!

Top
#1605651 - 06/08/2017 09:54 Re: Wrong torque in cambelt guides [Re: GrahamL]
skeandubh Offline
Club member 1598
Making a profit

Registered: 16/07/2008
Posts: 355
Loc: The Shire
Does seem like an error, however it's worth noting that the bolt size does not by itself dictate the torque setting. Material/class also requires to be taken into consideration.
_________________________

Top
#1605653 - 06/08/2017 10:37 Re: Wrong torque in cambelt guides [Re: GrahamL]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
True, but there are still max. torque settings due to the physical size of the fastener.

eg. from the "Standard Torque Values table" at :

http://electronicfilters.tpub.com/TM-10-4330-237-13P/css/TM-10-4330-237-13P_105.htm

even a 12.9 strength M-8 is only rated to 45NM, a 10.9 strength to 35NM, an 8.8 or 9.8 strength to 25NM and 4.8 strength to 13NM.

I just had another look at the nut and it appears to be marked 9.8 on the lower side so that ties up perfectly with the 25NM torque specified in the coupe engine manual.

So the 50NM from the guides is definitely wrong. I guess most people have just been tightening the nut by hand and not reaching much above 20-25NM , but I used a torque wrench and could feel the thread stretching before it hit the 50NM setting.

Hopefully they've made the stud a 10.9 and the nut has deformed first!

Top
#1606283 - 18/08/2017 14:50 Re: Wrong torque in cambelt guides [Re: GrahamL]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
The lock nut was still available from Fiat and it torqued down to 25nm no problem, so all is well with that.

Engine sounds fine and idles well but not taken it out on the road yet and now I've spotted gearbox oil leaking from both drive shaft seals after doing the clutch... seems there's always something else to go wrong! So it'll need stripped down again, happy days. rolleyes

Top