Author Topic: head gasket  (Read 967 times)

Offline Rabscuttle

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head gasket
« on: June 13, 2021, 03:22:22 PM »
Hello everybody,
I have a 16 v7ii stone with 40k and Im trying to replace the head gaskets. Im having trouble removing the valve part to get to the head. Is there a way to do this without damaging the fins?
Thanks,
Steve

Offline Dirk_S

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Re: head gasket
« Reply #1 on: June 13, 2021, 03:29:07 PM »
Hello everybody,
I have a 16 v7ii stone with 40k and Im trying to replace the head gaskets. Im having trouble removing the valve part to get to the head. Is there a way to do this without damaging the fins?
Thanks,
Steve

Do you mean the gaskets are sticking? If so, a rubber mallet has worked for me in the past. Maybe shoot some WD40 or PB BlastR in there.
Current: ‘16 Guzzi V7 II Stone, ‘78 BMW R80/7

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Offline Rabscuttle

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Re: head gasket
« Reply #2 on: June 13, 2021, 03:37:09 PM »
Thanks. I just realized that I need

 to remove these two nuts. This is going beyond what Im able to get done.

Offline Dirk_S

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Re: head gasket
« Reply #3 on: June 13, 2021, 03:54:39 PM »
Thanks. I just realized that I need

 to remove these two nuts. This is going beyond what Im able to get done.

 Oh yeah, I was going to ask if you made sure you got all the bolts and nuts out. I’m no mechanical genius, but I’ve taken them off as well when I had to replace a head due to to a seized header stud.  Wasn’t too hard, just got to make sure you get them torqued appropriately and keep things clean in there.
Current: ‘16 Guzzi V7 II Stone, ‘78 BMW R80/7

Previous: ‘15 Ural Gear Up, ‘77 Kawasaki KZ400 Special, ‘78 Honda CX500S, ‘80 Honda CX500D, ‘11 Suzuki TU250X

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Re: head gasket
« Reply #3 on: June 13, 2021, 03:54:39 PM »

Offline Rabscuttle

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Re: head gasket
« Reply #4 on: June 13, 2021, 04:11:57 PM »
It does make things easier! Thanks for the info. The header seems to be preventing removal. I did get the fitting off. Do I need to remove the entire exhaust?

Offline fotoguzzi

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Re: head gasket
« Reply #5 on: June 13, 2021, 04:16:05 PM »
Why are you replacing head gaskets?
MINNEAPOLIS, MN

Offline Rabscuttle

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Re: head gasket
« Reply #6 on: June 13, 2021, 04:33:58 PM »



Both sides are leaking.

Offline Pescatore

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Re: head gasket
« Reply #7 on: June 13, 2021, 05:12:43 PM »
This is the thread I was hoping for motivation.
I will be doing the same thing this winter.
 :popcorn:
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Online Antietam Classic Cycle

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Re: head gasket
« Reply #8 on: June 13, 2021, 05:15:03 PM »
Charlie

Offline fotoguzzi

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Re: head gasket
« Reply #9 on: June 13, 2021, 05:19:13 PM »



Both sides are leaking.
oh, is that common on small blocks?
MINNEAPOLIS, MN

Offline Rabscuttle

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Re: head gasket
« Reply #10 on: June 13, 2021, 05:25:00 PM »
This is the thread I was hoping for motivation.
I will be doing the same thing this winter.
 :popcorn:
I'll be your huckleberry.

Offline Rabscuttle

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Re: head gasket
« Reply #11 on: June 13, 2021, 05:36:43 PM »
Thanks! He doesnt put any goop or sealant on the gasket. Ive been reading i need to put permatex300. I have new OEM metal gaskets. Should I?

Theres a nick and scratches all around. Do I need to have it resurfaced?




« Last Edit: June 13, 2021, 06:25:39 PM by Rabscuttle »

Offline Pescatore

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Re: head gasket
« Reply #12 on: June 14, 2021, 05:08:19 PM »
I'll be your huckleberry.
:thumb:

Theres a nick and scratches all around. Do I need to have it resurfaced?
Looks like the old gasket was scraped off with a metal instrument that scratched the surface.  A light sanding on a flat surface might help, but I wouldn't chance it.
The gouge looks deep enough that you would have to remove too much material.  It doesn't go across the contact surface, so I wouldn't worry about it... provided you use the Super 300.
If it leaks again, then I would bring the heads to a machine shop to get cleaned/checked.


2008 Norge 1200
1991 V65GT
1980 CM400T
MGNOC Member
Ascolta sempre e solo musica vera
E cerca sempre se puoi di capire

Offline Rabscuttle

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Re: head gasket
« Reply #13 on: June 16, 2021, 03:34:19 PM »
The old one peeled right off. I havent looked at the other side yet. As far as I know Im the only one thats monkeyed with it. Ill try the permatex and see what happens. Thanks for the help.

Offline pat80flh

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Re: head gasket
« Reply #14 on: June 16, 2021, 03:40:29 PM »
FWIW, small block head gasket leaks are mentioned in Guzziology, and a brush on sealant is recommended. Those look just like the head gaskets on my V65, which I just replaced, along with the valves. No leaks!
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Offline Pescatore

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Re: head gasket
« Reply #15 on: June 16, 2021, 04:37:04 PM »
Hi pat80flh,
Where did you buy the valves from?
Did you replace guides or rods too?
Thanks,
P
2008 Norge 1200
1991 V65GT
1980 CM400T
MGNOC Member
Ascolta sempre e solo musica vera
E cerca sempre se puoi di capire

Online Antietam Classic Cycle

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Re: head gasket
« Reply #16 on: June 16, 2021, 04:43:54 PM »
When I rebuilt the heads on a customer's V65SP and few years ago, I bought the valves, guides and seals from MG Cycle. I also "updated" to Nevada (single) springs which required the seats and retainers from the same model, all purchased from Harper's.

https://www.mgcycle.com/index.php?main_page=product_info&cPath=68_127&products_id=2583
https://www.mgcycle.com/index.php?main_page=product_info&cPath=68_127&products_id=4401
https://www.mgcycle.com/index.php?main_page=product_info&cPath=68_127&products_id=2687
https://www.mgcycle.com/index.php?main_page=product_info&cPath=68_127&products_id=2572
Charlie

Offline pat80flh

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Re: head gasket
« Reply #17 on: June 16, 2021, 07:31:26 PM »
These heads had only 18k miles, guides had no discernible wear. I bought valves from MG Cycle and hand lapped them in. Re-used the springs and retainers. 
00 Bassa
80 FLH (in rehab)
84 V65C
75 850T prject

Offline Pescatore

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Re: head gasket
« Reply #18 on: June 16, 2021, 08:35:53 PM »
 :thumb:
Thanks for the responses.
2008 Norge 1200
1991 V65GT
1980 CM400T
MGNOC Member
Ascolta sempre e solo musica vera
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Offline acogoff

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Re: head gasket
« Reply #19 on: June 17, 2021, 08:00:03 AM »
   A sheet of 400 grit wet or dry on a piece of glass is what most people use to get out those nicks. Use a figure 8 pattern.
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Offline Vagrant

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Re: head gasket
« Reply #20 on: June 17, 2021, 08:09:37 AM »
They leaked because nobody re-torque them at the 600 mile first service. Don't make the same mistake.
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