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Author Topic: head reassembly  (Read 1443 times)

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Bonesaw

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head reassembly
« on: July 07, 2012, 07:20:35 AM »
1978 cb750k. Ok so I finally got the cylinder block back over the pistons (after much cussing and fernangeling) now I need to get the head back on the block. My manual doesn't show what goes where, and in my madness of trying to get the block back on the case, some rubber orings/gaskets fell out as did some of those metal cylinders that I think are oil passages or line-up pins.

What goes where? Does anyone have a picture/diagram of the top of the block/bottom of the head?
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Offline rklystron

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Re: head reassembly
« Reply #1 on: July 08, 2012, 03:38:46 AM »
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1970 CB750 K0 (Bought in 73)
1972 XL250 (Bought new in 72)
1973 ST90 (Free)
1975 XL250 (Free)
1975 Rickman CR750
1982 CBX1000 Pro-link
1975 CB750 DRAG BIKE
1977 Custom Built CB750 Sturgis Bike (GL front end).
1977 CB750 F2 (Big Resto)
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1978 CB750 K8 (My San Francisco ride)
1984 VFR750 (Bought New)

Bonesaw

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Re: head reassembly
« Reply #2 on: July 08, 2012, 10:31:59 AM »
oh crap there's o-rings that go inside the gasket? (#6 on the diagram)
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Offline rb550four

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Re: head reassembly
« Reply #3 on: July 08, 2012, 07:23:50 PM »
Those O rings are hard to get (unless you live near a marina) these and some other honda outboards are the only motors in the world that use that size o ring it seems, so don't loose them .
   As for the lost labor, it's just practice until you are comfortable with it. The cursing, there's always more of that.
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Offline MCRider

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Re: head reassembly
« Reply #4 on: July 08, 2012, 08:02:55 PM »
Quote from: Bonesaw on July 08, 2012, 10:31:59 AM
oh crap there's o-rings that go inside the gasket? (#6 on the diagram)
No those are only "inside the gasket" in a maner of speaking. They are actually pushed into grooves that surround the sleeve where it emerges from the aluminum cylinder block. If you never removed them they are still there. If you ahd it resleeved to a 900cc they would be gone.

Truth be told the bike runs just fine without them. They are a belt and suspenders approach to keeping oil from wicking up the outside wall of the sleeeves.

I may be wrong but I think they come with most gasket sets. If they don't its because as I mentioned they are not necesary.

First hand experience. Left them out several times on purpose.
« Last Edit: July 08, 2012, 08:05:26 PM by MCRider »
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