Head Bolt Torque

Mechanical issues and How-to articles.

Moderators: DAVID THOMPSON, phlat65

Head Bolt Torque

Postby cameronda » Fri Sep 08, 2017 4:53 am

G'day there
What is the correct head bolt torque for a ES250/2
The book says 5 KG-M which I work out to be about 36 F-lb
Working on this I snapped a head stud
Some of my other bikes come in at 16-17 f-lb
Though my waterbottle is 29 f-lb
This has probably been asked before or sorted out, I can't find it
Thanks in advance, only taken two years to get back to the bike
Dave
cameronda
 
Posts: 33
Joined: Thu Mar 27, 2014 10:03 pm

Re: Head Bolt Torque

Postby breakwellmz » Fri Sep 08, 2017 7:04 am

breakwellmz
 
Posts: 796
Joined: Sun Dec 16, 2007 7:11 am
Location: SW England

Re: Head Bolt Torque

Postby MZCountryRider » Fri Sep 08, 2017 8:24 am

Something is wrong with that converter. 5 kg/m = 36 ft. lbs.

https://www.convertunits.com/from/kg+m/to/lb+ft
Charlie
'69 Guzzi Ambassador
'71 Guzzi Ambassador
'72 Benelli 175 Enduro
'73 Guzzi Eldorado
'76 Guzzi I-Convert
'77 Morini 3 1/2 Strada
'81 Ducati 500SL Pantah
'82 Moto Guzzi V50 III
'97 MuZ Skorpion Tour


http://www.AntietamClassicCycle.com/
MZCountryRider
 
Posts: 120
Joined: Tue Jul 22, 2008 9:16 am
Location: western Maryland, USA

Re: Head Bolt Torque

Postby dandywarhol » Fri Sep 08, 2017 11:31 am

Was the bolt wet or dry?
Whale oil beef hooked
dandywarhol
 
Posts: 113
Joined: Tue Aug 25, 2015 8:35 am
Location: Edinburgh, Scotland

Re: Head Bolt Torque

Postby cameronda » Fri Sep 08, 2017 2:33 pm

If I recall I think dry, sometimes I put a bit of oil
Can not recall
two years to the day
cameronda
 
Posts: 33
Joined: Thu Mar 27, 2014 10:03 pm

Re: Head Bolt Torque

Postby cameronda » Fri Sep 08, 2017 3:12 pm

If I recall I think dry, sometimes I put a bit of oil
Can not recall
two years to the day
cameronda
 
Posts: 33
Joined: Thu Mar 27, 2014 10:03 pm

Re: Head Bolt Torque

Postby dandywarhol » Fri Sep 08, 2017 4:54 pm

There can be quite a difference between them both. Oily nut and bolt faces will take higher torque before the wrench clicks leading to the bolt stretching and potentially shearing
Whale oil beef hooked
dandywarhol
 
Posts: 113
Joined: Tue Aug 25, 2015 8:35 am
Location: Edinburgh, Scotland

Re: Head Bolt Torque

Postby cameronda » Fri Sep 08, 2017 5:13 pm

I know three of the four tightened, and the other snapped
I was wondering if this is the correct torque or I worked it out wrong or just shit happens
Dave
cameronda
 
Posts: 33
Joined: Thu Mar 27, 2014 10:03 pm

Re: Head Bolt Torque

Postby breakwellmz » Sat Sep 09, 2017 1:20 am

MZCountryRider wrote:Something is wrong with that converter. 5 kg/m = 36 ft. lbs.

https://www.convertunits.com/from/kg+m/to/lb+ft


That is really bad!
I came across that one by chance and just assumed it would be right without even thinking about it. :oops:
breakwellmz
 
Posts: 796
Joined: Sun Dec 16, 2007 7:11 am
Location: SW England


Return to Mechanic/Tech Talk

Who is online

Users browsing this forum: No registered users and 9 guests