Cylinder head crow foot spanner

02-03-2019, 08:48 AM

Hi all, new to this forum, suggested by my Ducati dealership.
I have a Ducati monster 400 (import from Japan, essentially a m600) and doing a full tear down rebuild. Just come to taking off the cylinder head and realized I need to get the special 15mm crow foot spanner. As these are not cheap I was wondering if anyone localish had one that I could borrow for a weekend or something. From North Hampshire.

Nickj · 02-03-2019, 10:03 AM

TENG do one for £11 dumb 3/8 drive though.

Not seen a 400 for a while

Darkness · 02-03-2019, 10:11 AM

Hi Matti.
You don’t see many of those about.
If you have access to oxi acetylene it is possible to modify a standard ring spanner by bending each end through 90 degrees. I’m sure someone on here has done one recently, but can’t see the post?

There’s this though:

http://www.ukmonster.co.uk/monster/s...uts#post558724

Darren69 · 02-03-2019, 10:44 AM

Darkness is right someone posted some pics of a home made one a few days ago.

Darren69 · 02-03-2019, 10:47 AM

It was Andy B and its here:-

http://www.ukmonster.co.uk/monster/s...t=57101&page=2

02-03-2019, 10:47 AM

I've got one you can borrow, not too far away! In Alresford.

Mr Gazza · 02-03-2019, 10:58 AM

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Luddite · 10-03-2019, 03:08 PM

There's a useful nugget of information in this month's Practical Sportsbikes magazine, which will be of interest to anyone using a torque wrench on a crows foot spanner as above. I'll quote it directly:

"Sometimes you'll need to use a crows foot or dogbone extension to get onto a fastener. In these cases the figure set on the wrench will no longer be the same as that applied to the fastener. You have to do a little sum.

Measure the normal effective length of the wrench and the extended effective length. Divide the first by the second (this will be less than one) then multiply it by the desired torque to get the new figure you should set the wrench to.

For example: You want 12Nm on a bolt. Your wrench's normal effective length is 300mm. The dogbone adds an effective 80mm. 300 divided by 380 is 0.79. 12 multiplied by 0.79 is 9.48. So something around 9.5Nm is what the wrench should be set to."

Every day's a school day!

slob · 10-03-2019, 04:56 PM

or use norbar’s handy app
https://www.norbar.com/en-gb/Home/Download-Apps

if you turn the crowfoot at 90deg to the torque wrench no change should be needed, as with the bent combination spanner as long as the drive/driven ends are on the same axis

02-03-2019, 08:48 AM	#1
Matti Guest Posts: n/a	Cylinder head crow foot spanner Hi all, new to this forum, suggested by my Ducati dealership. I have a Ducati monster 400 (import from Japan, essentially a m600) and doing a full tear down rebuild. Just come to taking off the cylinder head and realized I need to get the special 15mm crow foot spanner. As these are not cheap I was wondering if anyone localish had one that I could borrow for a weekend or something. From North Hampshire.

02-03-2019, 10:03 AM	#2
Nickj Too much time on my hands member Join Date: Jun 2007 Location: Forest Of Dean Bike: S2r Posts: 3,208	TENG do one for £11 dumb 3/8 drive though. Not seen a 400 for a while __________________ "The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature

02-03-2019, 10:11 AM	#3
Darkness . Join Date: May 2007 Location: Stockbridge Bike: M900 Posts: 1,984	Hi Matti. You don’t see many of those about. If you have access to oxi acetylene it is possible to modify a standard ring spanner by bending each end through 90 degrees. I’m sure someone on here has done one recently, but can’t see the post? There’s this though: http://www.ukmonster.co.uk/monster/s...uts#post558724 __________________ Original and Best since 1993 Last edited by Darkness; 02-03-2019 at 10:14 AM..

02-03-2019, 10:44 AM	#4
Darren69 Transmaniacon MOC Join Date: Sep 2013 Location: Sutton In Ashfield Bike: Multiple Monsters Posts: 6,095	Darkness is right someone posted some pics of a home made one a few days ago. __________________ Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage

02-03-2019, 10:47 AM	#5
Darren69 Transmaniacon MOC Join Date: Sep 2013 Location: Sutton In Ashfield Bike: Multiple Monsters Posts: 6,095	It was Andy B and its here:- http://www.ukmonster.co.uk/monster/s...t=57101&page=2 __________________ Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage

02-03-2019, 10:47 AM	#6
rman Guest Posts: n/a	I've got one you can borrow, not too far away! In Alresford.

02-03-2019, 10:58 AM	#7
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,984	[/ __________________

10-03-2019, 03:08 PM	#8
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	Torque setting adjustment for crows foot spanners There's a useful nugget of information in this month's Practical Sportsbikes magazine, which will be of interest to anyone using a torque wrench on a crows foot spanner as above. I'll quote it directly: "Sometimes you'll need to use a crows foot or dogbone extension to get onto a fastener. In these cases the figure set on the wrench will no longer be the same as that applied to the fastener. You have to do a little sum. Measure the normal effective length of the wrench and the extended effective length. Divide the first by the second (this will be less than one) then multiply it by the desired torque to get the new figure you should set the wrench to. For example: You want 12Nm on a bolt. Your wrench's normal effective length is 300mm. The dogbone adds an effective 80mm. 300 divided by 380 is 0.79. 12 multiplied by 0.79 is 9.48. So something around 9.5Nm is what the wrench should be set to." Every day's a school day!

10-03-2019, 04:56 PM	#9
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,737	or use norbar’s handy app https://www.norbar.com/en-gb/Home/Download-Apps if you turn the crowfoot at 90deg to the torque wrench no change should be needed, as with the bent combination spanner as long as the drive/driven ends are on the same axis