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Marty_Guzzi
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« on: February 07, 2010, 07:59:22 PM » |
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Okay, on a 96 Cali, are the hex head bolts on the sump aluminum? Should they be replaced with stainless steel ones?
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guzzisteve
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« Reply #1 on: February 07, 2010, 08:13:54 PM » |
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Long ones are cad plated steel
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"Pray through Carlo & your bike shall be healed"
Location: Planet Earth
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pehayes
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« Reply #2 on: February 07, 2010, 11:08:07 PM » |
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Okay, on a 96 Cali, are the hex head bolts on the sump aluminum? Should they be replaced with stainless steel ones?
Why did you ask this question? Are you just curious about metalurgy? Or have you confronted some issue, error, problem? Please explain more and maybe you'll get more answers. Patrick |
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Spaceclam
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« Reply #3 on: February 08, 2010, 01:15:07 AM » |
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Aluminum heads are easy to strip. If you need to replace one, use steel
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Rolf Halvorsen
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« Reply #4 on: February 08, 2010, 01:25:00 AM » |
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Zinc plated screws are far better than stainless. Just renew them if they start to corrode.
Stainless screws will destroy the threads in the aluminim faster than zinc plated material.
I never use stainless screws in connection with aluminium. I use only zinc plated with a lot of copper grease.
Rolf
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Holt
Guzzi Hero
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Age: 59
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« Reply #5 on: February 08, 2010, 04:08:36 AM » |
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Zinc plated screws are far better than stainless. Just renew them if they start to corrode.
Stainless screws will destroy the threads in the aluminim faster than zinc plated material.
I never use stainless screws in connection with aluminium. I use only zinc plated with a lot of copper grease.
Rolf
Wouldn't aluminum grease be a better choice, to avoid galvanic corrosion in connection to road salt? |
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Anders Holt
Breva V 750 ie "Rossinante" '03
SMC/FEMA/LTT
"El camino amigo, el camino y nada mas"
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Two Checks
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« Reply #6 on: February 08, 2010, 06:41:44 AM » |
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If road salt is getting on the threads of your sump bolts, grease isn't your problem.
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1990 Cal III f/f "Il Duce' III"
1987 1000 SPII "Il Duce' II"
1980 Suzuki GS1000G
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Marty_Guzzi
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« Reply #7 on: February 08, 2010, 07:04:00 AM » |
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Okay, on a 96 Cali, are the hex head bolts on the sump aluminum? Should they be replaced with stainless steel ones?
Why did you ask this question? Are you just curious about metalurgy? Or have you confronted some issue, error, problem? Please explain more and maybe you'll get more answers. I fear stripping the hex heads out, and really having a problem. I need to change oil again, and thought I would replace them this time, if it made sense. Patrick |
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rodekyll
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« Reply #8 on: February 08, 2010, 12:45:34 PM » |
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As long as the threads and heads are good and they are not stretched all is well. They only get 5 - 7# torque, so fatigue is not a common problem.
Don't use a ball-headed allen wrench on them or the heads will get chewed up.
Don't use stainless for sump bolts.
If you're really worried about stripping sump bolts get an adapter to put the filter on the outside of the bike.
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'76 ConVolution -- Convert + EV EFI motor "Rodekyll"
'04 CalVert -- EV + Convert Transmission "EV'l Twin"
IBA 33429
MGNOC L-812
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"Son, there are some things in life a motorcycle endorsement doesn't prepare you for."
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Holt
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« Reply #9 on: February 08, 2010, 01:28:03 PM » |
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If road salt is getting on the threads of your sump bolts, grease isn't your problem.
Stacking aluminum, iron and copper generally isn't a good idea. And some grease will probably sneak past the threads anyway.  It may not be an issue. Probably not. But it's a bad habit and can lead to unwanted side effects. |
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Anders Holt
Breva V 750 ie "Rossinante" '03
SMC/FEMA/LTT
"El camino amigo, el camino y nada mas"
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pehayes
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« Reply #10 on: February 08, 2010, 02:45:40 PM » |
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Okay, on a 96 Cali, are the hex head bolts on the sump...
Please clarify. Are you speaking about the 14 perimeter machine screws which have Allen Head recessed hex? Or are you speaking about the four central machine screws with external hexagonal heads in the bottom face of the sump? There are different mechanical and environmental concerns for each. Patrick Hayes Fremont CA |
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guzzisteve
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« Reply #11 on: February 08, 2010, 04:41:08 PM » |
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The only HEX head bolts on the pan are the long interior ones for oil system (stock 96 Cali)
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"Pray through Carlo & your bike shall be healed"
Location: Planet Earth
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RayB
Guzzi Mentor
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Location: NW Indiana
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« Reply #12 on: February 08, 2010, 04:54:23 PM » |
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Zinc plated screws are far better than stainless. Just renew them if they start to corrode.
Stainless screws will destroy the threads in the aluminim faster than zinc plated material.
I never use stainless screws in connection with aluminium. I use only zinc plated with a lot of copper grease.
Rolf ditto If you use SS bolts you run the risk of galling the aluminum and pulling the threads. This is true on any motorcycle application, not just Guzzi. Why not use the bolts that were designed for the application. If the existing bolts are corroded or otherwise buggered, replace with original spec bolts. ...my opinion. |
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01 EV
82 BMW R100
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rocker59
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« Reply #13 on: February 08, 2010, 05:59:03 PM » |
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The only HEX head bolts on the pan are the long interior ones for oil system (stock 96 Cali)
Yep. |
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Marty_Guzzi
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« Reply #14 on: February 08, 2010, 07:02:57 PM » |
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Mine are all hex head bolts, the 14 aluminum and 4 longer ones. Anyway, thanks for the comments, and my questions have been answered.
Marty
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rocker59
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« Reply #15 on: February 08, 2010, 07:08:09 PM » |
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Mine are all hex head bolts, the 14 aluminum and 4 longer ones. Anyway, thanks for the comments, and my questions have been answered.
Marty
The perimeter bolts should be "socket head" and use Allen Keys. The four bolts in the middle of the sump should be "hex head" having six sides and using normal wrenches. |
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Marty_Guzzi
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« Reply #16 on: February 08, 2010, 10:58:02 PM » |
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Mine are all hex head bolts, the 14 aluminum and 4 longer ones. Anyway, thanks for the comments, and my questions have been answered.
Marty
The perimeter bolts should be "socket head" and use Allen Keys. The four bolts in the middle of the sump should be "hex head" having six sides and using normal wrenches. Okay, you are probably right. I haven't looked under there a while. |
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