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GT40 Gasket, Riser, Manifold |
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SKIGT40 
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Joined: May-08-2017 Location: CANADA Status: Offline Points: 19 |
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 Topic: GT40 Gasket, Riser, ManifoldPosted: May-08-2017 at 8:35pm |
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Hi All
I'm new to posting but have been reading the forum for years. I have a 95 Ski Nautique196 GT40 EFI, I'am replacing the gaskets in-between the riser and manifold that i bought from SKIDIM. Is it possible to sand down the riser and manifold? What would be the best way to do it? |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21107 |
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Posted: May-08-2017 at 8:39pm |
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60 grit sandpaper wrapped around a sanding block works well.
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lewy2001
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Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Posted: May-08-2017 at 8:50pm |
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Bastard file and a good eye. Keep a straight edge handy to check that good eye though
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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gun-driver
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Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4112 |
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Posted: May-08-2017 at 9:11pm |
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I did mine last year when I added a 1" riser block and did not see a need to flatten the surface.
Is yours rusted badly or are you trying to remove the old gasket why do you need to sand/flatten the surface. oops misread post thought he was talking intake manifold, damn Molson Canadian... never mind 
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SKIGT40
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Joined: May-08-2017 Location: CANADA Status: Offline Points: 19 |
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Posted: May-08-2017 at 9:52pm |
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I have cleaned them off with steel wool , but there is a bit of rusty unevenness in some places. I'm not sure what is a reasonable amount of unevenness. I would post a pic but am not quit sure how to do it, Do i need to request permission from the forum?
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: May-08-2017 at 10:14pm |
Russ, Use the "post reply" and not the quick. Click on the icon of the tree with the up arrow. A browse box will come up allowing you to select anything off your computer. Welcome to posting. Pictures of the boat would be great too. |
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2tall
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Joined: November-10-2015 Location: MT Status: Offline Points: 47 |
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Posted: May-11-2017 at 7:54pm |
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I had a similar issue on my thermostat housing and I used a fine grit sandpaper on a drill attachment like a sanding disc, but it had a soft back. It was from a 3m headlight restoration kit. The sandpaper was 500 or maybe even 750 grit. If I paid close attention and kept the disc as level as possible and only did a little bit of sanding then backed off, then a little, then back off, it worked perfectly and cleaned up the surface nicely, but I was only after removal of a very small amount of rust.
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2Tall - 1996 Ski Nautique GT-40
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TRBenj
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Posted: May-11-2017 at 8:02pm |
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I would skip the goop and focus on getting the mating surfaces flat.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: May-11-2017 at 8:05pm |
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Mark's method is the best for cleaning up a gasket surface by hand especially surfaces that must be as flat as possible.
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SKIGT40
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Posted: May-11-2017 at 8:12pm |
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Update, I sanded it down with metal sand paper with a vibrating sander first with 100 grit then 600. Came out great very smooth and got rid of the rusty spots and unevenness.
I'm Still Having Issues uploading Pics, I get error messages. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: May-11-2017 at 9:34pm |
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Again, any gasket surface needs to be flat. A flat bastard file and a straight edge works. Anything with a soft backing pad such as a vibrating sander, a dual action sander or a disk sander will round over the flat surface. Do not rely on any type a thick gasket compound such as silicone to seal a surface meant to be flat.
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SKIGT40
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Posted: June-26-2017 at 5:19pm |
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To sum up . I sanded everything down smooth as possible . Put new gaskets from ski dim. Then was able to source the bolts from fastenal, the small ones were exact size the big ones I had to cut a 1/4 inch for it to fit. Bolts were grade 8 zink plated, bolts costed me about 10 bucks. All seems to be good now, thanks All for the advice.
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gun-driver
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Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4112 |
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Posted: June-27-2017 at 12:58am |
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Coat the bolts with anti-seize to keep them from rusting in place.
I take mine out one at a time and re-coat about every other year or so. They still look like brand new and easy in easy out. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: June-27-2017 at 6:44am |
Paul, Maybe you should try a better brand of anti seize or, get some help with that OCD issue! 
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JPASS
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Joined: June-17-2013 Location: Orlando Status: Offline Points: 2283 |
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Posted: June-27-2017 at 8:28am |
First thing I thought of when I read your reply  |
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'92 Correctcraft Ski Nautique
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SKIGT40 wrote: