Differences left/right cylinder heads?


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kndw
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Joined: Sat Jun 19, 2010 2:56 am
Location: Driebergen, Utrecht
Motorcycle: 1976 GL1000 Plempbak

Differences left/right cylinder heads?

Post by kndw » Thu Dec 14, 2017 3:20 am



Hi,

The cylinder heads of my '76 GL1000 have been rebuilt at a machine shop, and now I'm puzzled as to which head is the left, and which is the right.

The only differences I could find were:
1. some markings on the bottom of each head. Both have the letters 'ZL', but one head also has marking that say "3 KR", while the other has "4 KR";
2. there is some residue of the rubber seals at 3 of the 4 'holes' where the camshafts exit the head, making me suspect that the clean one is where the fuel pump was, since that hole doesn't have such a gasket. That would make that the right hand head.

Am I missing something really obvious? Even if the heads are identical, I imagine it is of importance to match the camshaft and head as they were.

Thanks!



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Fred Camper
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Re: Differences left/right cylinder heads?

Post by Fred Camper » Thu Dec 14, 2017 8:45 am

The fuel pump is a solid clue. I would go with that since I have not heard they are identical. So since I too am not sure, go with the clue.

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WingAdmin
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Re: Differences left/right cylinder heads?

Post by WingAdmin » Thu Dec 14, 2017 10:28 pm

They are identical - looking at the parts manual, the left and right head assemblies have the same part numbers.

That said, I'm with you - I would match them to the way they were, as they've been spending almost 40 years seating into one another.

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DenverWinger
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Re: Differences left/right cylinder heads?

Post by DenverWinger » Fri Dec 15, 2017 1:24 am

The camshafts are the clue, I had heads machined without removing cams, so the fuel pump drive and ignition point drive were a dead giveaway. But if the cams were removed, since same part number both heads either cam should fit either head. So best guess at that point....
They say 98% of all Hardleys ever made are still on the road..... The other 2% made it home. :lol:
(I stole this from somebody on another GW site...) :roll:

kndw
Posts: 58
Joined: Sat Jun 19, 2010 2:56 am
Location: Driebergen, Utrecht
Motorcycle: 1976 GL1000 Plempbak

Re: Differences left/right cylinder heads?

Post by kndw » Fri Dec 15, 2017 1:36 am

WingAdmin wrote:
Thu Dec 14, 2017 10:28 pm
They are identical - looking at the parts manual, the left and right head assemblies have the same part numbers.
:D Smart! Should have thought of that.

Alright, I'll go with the fuel pump clue.



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