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Head gasket goo

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hendy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hendy Quote  Post ReplyReply Direct Link To This Post Topic: Head gasket goo
    Posted: 22 Feb 2018 at 19:34
Hi.
Having removed a head on my 71 V7 to check for chrome bores (no), I notice that the head gasket had been put on with some jointing compound.  I wouldn't use this on my Triumphs, but I'd be interested to hear if it's a good or a bad idea on an old Guzzi.
Cheers
Roy
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c13pep View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2018 at 21:13
I wouldn`t use it on any cylinder head but I would check the mating surfaces for being true or maybe it was a quick repair to save the cost of a new gasket!
CHRIS
you can`t have any fun in a straight line

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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2018 at 21:17
Hi Roy, assuming you'll be using new gaskets (of course), there's no reason to use compound.

However I've found it profitable to re-torque the heads after simply  warming up the engine once and letting it cool off completely (dead cold), then once again after riding 500 km/ 300 miles or so.
It' a bit of work but you'll find the torque wrench takes up a tiny bit of slack each time, so the work is not in vain.
JP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2018 at 21:18
I don't use any gasket goo on the cylinder head gasket on my Guzzi. I put the gasket on dry and don't have any leaks......not from the head gasket anyway.
 
Also I second what jpc has said about re-torquing.
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2018 at 22:16
No never done it.

"Chicken nuggets don't dance on a Tuesday."
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hendy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hendy Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 09:08
Thanks for confirming my own thoughts.  I can't see that some compound would have much resistance to a combustion chamber leak in any case. 
Likewise the Triumph twins with the compound gaskets also benefit from re-torqueing two or three times.  I understand that modern engines use 'stretch' bolts to compensate for settling.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 10:18
Originally posted by hendy hendy wrote:

Hi.
Having removed a head on my 71 V7 to check for chrome bores (no),


So does it have replacement Nikasil bores then?

TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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iansoady View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 10:26
Don't know about Guzzis but on my Commando I always used a very thin coat of Wellseal (combined with a well annealed copper gasket) which cured the ubiquitous leak from the pushrod tunnels.
Ian
1982 V50
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johnno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 12:45
i have used it many times on old british bikes ,it works . The only thing to be careful of is getting any in a oil passage . 
GSXR1100 L ,Moto Guzzi 650tt/ntx.750xpa,t5 850.1100 sport,1100 sport corsa rider
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 13:01
True Johnno, but it's not nearly as dangerous as Silicone RTV.I've seen at least two big end seizures due to that stuff.Not on my bikes though, I wouldn't give it house (shed)room.

TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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iansoady View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 14:13
Silicone is good for sealing exhaust pipes but not much else IMO. I've never had a problem with Wellseal blocking oilways.
Ian
1982 V50
1952 Norton ES2
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hendy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hendy Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 16:03
Yes the bores appear to be Nikasil.
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