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1Back to top Go down    Camshaft caps on Sun May 22, 2016 4:56 pm

Dai

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Are they line bored to fit that one cylinder head or precision bored so that any fits any? I just had an interesting weekend that culminated in putting two helicoils into the timing chest and a further four into the cylinder head, all just to secure the cam cover. On no.3 exhaust camshaft cap the boss to secure the cam cover was broken into four parts (fortunately they'd stayed in the cam cover and not made a dive for the sump). Around three complete threads had survived right at the bottom of the boss, so I was able to cut an allen bolt down to exactly the right length and put some gasket cement behind the new rubber bolt seal to keep the oil in.

If the caps are precision bored than I'll replace the cap, but I don't really fancy replacing the cylinder head.


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'83 K100 upgraded to K100RS spec
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'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

2Back to top Go down    Re: Camshaft caps on Sun May 22, 2016 5:20 pm

Inge K.

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As the caps isn't sold as a single part, only together with a cylinder head
.......it seems like they are line bored.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

3Back to top Go down    Re: Camshaft caps on Sun May 22, 2016 5:43 pm

k-rider

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I have replaced one, without any trouble.

Maybe i was just Lucky.

K-rider


4Back to top Go down    Re: Camshaft caps on Sun May 22, 2016 6:09 pm

Dai

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@Inge K. wrote:As the caps isn't sold as a single part, only together with a cylinder head
.......it seems like they are line bored.
I expected them to be line bored for accuracy, but I just thought I'd ask. Looks like I'm going to leave my 'temporary' repair in place; my guess as to why the cam cover has so many securing points (12!!) is to prevent it from heat warping. It's a very light casting.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

5Back to top Go down    Re: Camshaft caps on Mon May 23, 2016 5:34 am

92KK 84WW Olaf


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Definitely line bored........

If you are using different caps my only suggestion is watch for and possibility of binding on the camshaft, camshaft will feel tight. An old hand told me that in such cases he would bolt up his cams so he could check they would turn freely by hand and only then put in the valve gear. Misalignment will increase turning resistance big time. Outcome would be broken camshaft....


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 83,150miles
    

6Back to top Go down    Re: Camshaft caps on Mon May 23, 2016 6:56 am

Dai

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I was thinking about it last night. It's not going to miss one bolt, so next time the cam cover comes off I'm just going to seal the bolt hole and not worry about it.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

7Back to top Go down    Re: Camshaft caps on Mon May 23, 2016 7:15 am

K75cster

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If you chose another replacement cap why would you not lap it in like we would with a white metal bearings In the old days?
Bearing blue would surely do it correctly. I mean it works with old pommycranks why not our cam caps???


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

8Back to top Go down    Re: Camshaft caps on Sun Jun 12, 2016 11:49 pm

Kai Ju

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Some more options:

1. Get a cam cap and plasti gauge it along its entire surface or at least at the bottom, middle and top.
If the clearance is the same in all three locations you're good to go.
2. Take the valve cover bolt for the broken cam cap and install it in the cover with a self locking nut. Trim the bolt to fit. You may have to remove the remainder of the original threaded portion from the cam cap to clear the nut or use a skinny nut.
3. Have the broken cam cap welded and re-threaded.

    

9Back to top Go down    Re: Camshaft caps on Mon Jun 13, 2016 6:26 am

Dai

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The cam cover doesn't flex enough to make it worth the effort. Now, if it was two cam caps side-by-side, that would be a different matter.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

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