Home » Public Forums » GMCnet » [GMCnet] Gasket Options for Choke Heater Block-off Plate?!?
| [GMCnet] Gasket Options for Choke Heater Block-off Plate?!? [message #364147] |
Thu, 20 May 2021 18:33  |
Rob
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Registered: November 2013
Location: Victoria, BC
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I had been chasing an exhaust leak for a while - it turns out that the block-off plate that a PO installed was the source! I thought I had a small piece of Remflex that would have worked well for a new gasket - but of course I haven't seen it in 3 years and I'm supposed to be driving the GMC tomorrow - so I just want to get something in there ASAP!
I see this in stock nearby:
Permatex Ultra Copper High Temperature Gasket Maker 101BR
Or should I be able to make a gasket to seal the plate? What material?
Thoughts? Thanks!
Rob
76 Royale Twin Beds, Dry Bath
Victoria, BC
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| Re: [GMCnet] Gasket Options for Choke Heater Block-off Plate?!? [message #364151 is a reply to message #364147] |
Fri, 21 May 2021 12:59  |
TR 1
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Location: DFW
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A small piece of annealed copper sheet would probably do the job.... Cut it out in the shape of the block off plate, punch a couple holes for the bolts and you'd be good...
Coper prices are through the roof right now, though... So as long as you can find a small sheet, or have some laying around to use, this would be a good option.
For that copper silicone, I've had mixed luck with it throughout the years... Depends where it's used, how hot it gets, how much pressure the joint sees, etc.
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| [GMCnet] Re: Gasket Options for Choke Heater Block-off Plate?!? [message #364153 is a reply to message #364151] |
Fri, 21 May 2021 13:15 |
Rob
Messages: 651
Registered: November 2013
Location: Victoria, BC
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Thanks!
That's exactly what I ended up doing - a friend (that USED to have a GMC MH!) that works on vintage motorcycles had a perfectly sized sheet. I had not thought of using it - so thanks to him and you.
I also ordered the stock Fel-Pro (72586) gasket - to have just in case. I don't have far to drive in the next few days - so I'm sure I'm in a better position than I was before I found the leak!
I'm hoping (and rather expecting) that my exhaust leak will be considerably reduced once I start it.
Rob
76 Royale Twin Beds, Dry Bath
Victoria, BC
> On May 21, 2021, at 10:59 AM, Mark Sawyer wrote:
>
> A small piece of annealed copper sheet would probably do the job.... Cut it out in the shape of the block off plate, punch a couple holes for the
> bolts and you'd be good...
>
> Coper prices are through the roof right now, though... So as long as you can find a small sheet, or have some laying around to use, this would be a
> good option.
>
> For that copper silicone, I've had mixed luck with it throughout the years... Depends where it's used, how hot it gets, how much pressure the joint
> sees, etc.
> --
> Mark S. '73 Painted Desert,
> Manny 1 Ton Front End,
> Howell Injection,
> Leigh Harrison 4bag and Rear Brakes,
> Fort Worth, TX
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| Re: [GMCnet] Re: Gasket Options for Choke Heater Block-off Plate?!? [message #364154 is a reply to message #364153] |
Fri, 21 May 2021 14:05 |
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Matt Colie
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Registered: March 2007
Location: S.E. Michigan
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Rob wrote on Fri, 21 May 2021 14:15Thanks!
That's exactly what I ended up doing - a friend (that USED to have a GMC MH!) that works on vintage motorcycles had a perfectly sized sheet. I had not thought of using it - so thanks to him and you.
I also ordered the stock Fel-Pro (72586) gasket - to have just in case. I don't have far to drive in the next few days - so I'm sure I'm in a better position than I was before I found the leak!
I'm hoping (and rather expecting) that my exhaust leak will be considerably reduced once I start it.
Rob
76 Royale Twin Beds, Dry Bath
Victoria, BC
Rob,
Copper is really a poor gasket material unless it can be embossed and later annealed. Even then, it has issues. I suggest that you start by resurfacing the blocking plate that will have been cut away by the leaking exhaust. If you can't get it at least as flat as the manifold opening, you will never get it sealed off. The Fel-Pro part is probably a perforated core 6150 material, and it will work if you flatten that plate. As you have the high temperature Permatex, you might as well put some on the plate and barely snug the fasteners. Then come back tomorrow and make them up.
When Federal Mogal bought both Fel-Pro (previously a family owned company) and McCord (previously owned by lots of different and less than interested companies), it has been hard to offer real advice because I don't know what anybody is actually shipping in the box these days.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| [GMCnet] Re: Gasket Options for Choke Heater Block-off Plate?!? [message #364157 is a reply to message #364154] |
Fri, 21 May 2021 14:46 |
Rob
Messages: 651
Registered: November 2013
Location: Victoria, BC
Karma: 3
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Thanks.
The blocking plate that was in there is likely too thin. I may see if I can't fabricate a thicker one - but right now I want to see if I can get it sealed enough...
Rob
76 Royale Twin Beds, Dry Bath
Victoria, BC
> On May 21, 2021, at 12:05 PM, Matt Colie wrote:
>
> Rob,
>
> Copper is really a poor gasket material unless it can be embossed and later annealed. Even then, it has issues. I suggest that you start by
> resurfacing the blocking plate that will have been cut away by the leaking exhaust. If you can't get it at least as flat as the manifold opening, you
> will never get it sealed off. The Fel-Pro part is probably a perforated core 6150 material, and it will work if you flatten that plate. As you have
> the high temperature Permatex, you might as well put some on the plate and barely snug the fasteners. Then come back tomorrow and make them up.
>
> When Federal Mogal bought both Fel-Pro (previously a family owned company) and McCord (previously owned by lots of different and less than interested
> companies), it has been hard to offer real advice because I don't know what anybody is actually shipping in the box these days.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
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