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Message started by mscepu101 on 05/14/13 at 19:49:44

Title: Torque Values?
Post by mscepu101 on 05/14/13 at 19:49:44

I am at the point of reassembling the cylinder head after installing a new oil plug and would like to know the torque values for the reinstallation of the bolts.

I know there is a torque value list but I must admit I do not know the name for the bolts .

I assume they are the cylinder head bolts but is the value only between 8-1 ft-lbs?

Title: Re: Torque Values?
Post by Dave on 05/15/13 at 04:56:47

The Table in the Tech Session says 5.9 to 8.8 foot pounds. These are thin 6mm bolts and the aluminum head they are threaded into can't take a lot of extra torque.....so tighten them in a criss cross pattern and start snugging them up a little at a time before you tighten them to the final torque.

Title: Re: Torque Values?
Post by Routy on 05/15/13 at 07:17:12

6mm head bolts,.....is that for real ?? Thats hardly a 1/4 inch !
There must be plenty of them,.....don't recall gaskets being a problem here.
6 mm ?? I mite have to look for myself. :o

Title: Re: Torque Values?
Post by Dave on 05/15/13 at 07:28:22

232C362D313724262E2037450 wrote:

6mm head bolts,.....is that for real ?? Thats hardly a 1/4 inch !
There must be plenty of them,.....don't recall gaskets being a problem here.
6 mm ?? I mite have to look for myself. :o

The bolt thread is 6mm.....the hex head is 10mm. The bolts in question are for the "head cover".

Title: Re: Torque Values?
Post by Digger on 05/15/13 at 19:06:48

53686572636F747269616C73000 wrote:

.....so tighten them in a criss cross pattern...

A while back, I offered up this tightening pattern as a straw man. So far, nobody's sh*t on it.....

When installing the cylinder head cover, the FSM says to tighten the cylinder head bolts "diagonally." Clymers says the same thing, but adds to tighten the bolts in the middle of the cylinder head cover first.

With this vague guidance in mind, here is the bolt tightening order I've arrived at after removing and installing the cylinder head cover a few times (loosening order (e.g. when removing the cylinder head) will be the reverse of the tightening order):

http://i235.photobucket.com/albums/ee201/Digger109/LS650/HeadCoverBoltTorqueOrder-4E.jpg

My methodology was to start with the inner-most bolts and move diagonally as much as possible. This is just the pattern I have been using. Your way most likely will be better, please share if so.

I torque these bolts using a 0-200 in-lb beam torque wrench in three stages (snug, half-torque, full-torque).

Note that the bolt associated with position #12 in the above picture represents a special challenge. This is because said bolt is also used to secure the port decorative chrome head cover. However, with that cover in place, some of the other head cover bolts would be hard to access.

However, if you don't mind going through a little extra trouble, you can still torque the head cover in a complete fashion - to include bolt #12.

Here is what I used to take the place of the decorative head cover - a stack of washers:

http://i235.photobucket.com/albums/ee201/Digger109/LS650/HeadCoverSpacerE.jpg

I just place a bunch of washers on the bolt. This allows me to torque the bolt down properly.

After the gasket sealant used on the head cover is cured, I remove the washers and install the left decorative chrome head cover, taking care to re-torque the subject bolt properly.

IHTH someone!