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Message started by polloloco83 on 01/25/13 at 19:05:25

Title: Head bolt tightening sequence
Post by polloloco83 on 01/25/13 at 19:05:25

The Clymer manual states "tighten the bolts in a crisscross patter, starting with the center bolts (surround the camshaft) and working outward" but provides no dummy-proof picture for me. I remember my Jeep service manual gave me a picture showing a clockwise spiral from the center outward for the cylinder head. Can someone provide me a picture of the tightening sequence? I plan to fix my leaking plug tomorrow.

Table 2 also lists the torque for Cylinder head nuts, but I thought that I remove bolts to do this job.

Title: Re: Head bolt tightening sequence
Post by Digger on 01/25/13 at 19:35:24

Pol,

Well, the 4 topmost head bolts are easy - it's a simple criss-cross pattern.

If you are referring to the head cover bolts, you are right, the FSM does not specifically call out a certain pattern. I threw one out there a few years ago and nobody here has crapped on it (yet):

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

You will find that location #12 presents an elevated challenge. That is because that hole is used for the bolt that serves to also fasten the forward-port corner of the chrome decorative head cover into place. However, you really can't put said cover into place until you are have torqued all of the head cover bolts, since said cover, when installed, prevents access to some of said bolts. And, if you think you can just install the bolt that corresponds to location #12 later, you may find yourself faced with an oil leak, as the head cover sealant may set up a little too thick in that particular location (DAMHIK!).

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 placed a bunch of washers on the bolt. This allowed me to torque the bolt down properly.

After the gasket sealant used on the head cover was cured, I removed the washers and installed the left decorative chrome head cover.

If anybody can improve on this, please take this opportunity to speak your piece now.....I welcome it!

IHTH!

Title: Re: Head bolt tightening sequence
Post by polloloco83 on 01/26/13 at 09:24:42

Yes, I do mean head cover bolts, and that picture helps a lot. I'm used to a block, cylinder head, and valve covers as on my Jeep, this engine is built a bit differently. Am I reading correct that I tighten to only 21-24 lt-lbs?

Title: Re: Head bolt tightening sequence
Post by justin_o_guy2 on 01/26/13 at 10:51:25

Digger said

However, you really can't put said cover into place until you are have torqued all of the head cover bolts, since said cover, when installed, prevents access to some of said bolts.

& he said a lot.

Title: Re: Head bolt tightening sequence
Post by trisuz on 01/26/13 at 15:22:19

The torque spec for the Cylinder head cover bolts is 6-8.5 ft.-lb.
Page 147 table 2 in clymers. If you use 21-24 ft.-lb. you'll most likely break ever one. Also be sure you are at tdc on the combustion stroke before you remove the bolts. There are some great threads on this procedure, I highly recomend you read them all. It's not really difficult if your mechanically inclined but there are a few details to look out for.
Good luck.

Terry

Title: Re: Head bolt tightening sequence
Post by cafecarl on 02/01/13 at 07:55:18

Hey, I'm not trying to hijack this thread, but I'm also putting my head cover on and digger posted such a great photo of the cover and the sequence it will help me explain my problem.
I have an '86, the chrome covers will not be going back on.
I'm all good with the challenge marked 12 in the sequence, I have a stud ready to go in that spot. My question is over where the hole marked 14 is located. this hole doesn't pass through the breather so I'm thinking it isn't part of the squeezing action, but mine has another hole (that I don't see on his) just north of what he has marked as #14. It passes down through the cooling fins of the head but doesn't have any threads. The book shows it on the length chart as 115 mm. Any ideas what's going on? Polloloco, sorry to jump in, hope you're getting along OK.

Title: Re: Head bolt tightening sequence
Post by verslagen1 on 02/01/13 at 08:04:01

the 14 spot is mis located, should be on the bolt above it.

where it's currently at is a chrome cover mounting hole, which is a blind hole.

Title: Re: Head bolt tightening sequence
Post by cafecarl on 02/01/13 at 10:37:59

Thanks Versy, I now see that a PO broke that bolt off down close to the jug. Thats why I couldn't get the new bolt theads to catch. :-/

Title: Re: Head bolt tightening sequence
Post by Digger on 02/01/13 at 18:57:50

415245445B5650525906370 wrote:

the 14 spot is mis located, should be on the bolt above it.

where it's currently at is a chrome cover mounting hole, which is a blind hole.

Actually spot 14 is in the right location.

I placed the spot 14 magenta circle right over where the associated head cover bolt hole is.

The following "raw" photo shows this more clearly:

http://i235.photobucket.com/albums/ee201/Digger109/LS650/HeadCoverBoltTorqueOrder-5E.jpg

As you can see, hole #14 was somewhat obscured due to the angle of the camera when I took the shot. Note that the bolt hole just below and to the left of hole #14 is, indeed, a blind hole used to mount the decorative chrome cover.

IHTH!