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Manifold replacement GT40 bolt selection |
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HondaF1 
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Joined: August-03-2015 Location: PA Status: Offline Points: 20 |
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 Topic: Manifold replacement GT40 bolt selectionPosted: October-19-2015 at 12:43pm |
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I am contemplating what is all needed to replace the manifolds on my 2000 Ski Nat. The boat was used in brackish water before I purchased it and the Allen head bolts on the manifolds and rusted away.
I see you can get a kit with all the needed gaskets and bolts: http://www.nautiqueparts.com/pcmexhaustmanifoldservicekit.aspx However I have seen posts on this site and others mentioning they used stainless steel Allen heads (obviously with anti seize). I was wondering this was standard practice? I bet I have to drill out just about all the bolts, fun, fun!! Any advice will be appreciated. Rick |
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: October-19-2015 at 1:45pm |
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There are kits but just so you know that one is for a Chevy. You can get what you need from other locations for much cheaper if you look around, ie the riser to manifold bolts are nothing special. Reuse the water fittings,get new pipe plugs at McMaster Carr when you order new manifold to block bolts. Most here will tell you to stainless and anti seize. You will see why when you try to remove the old as you already guessed
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2976 |
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Posted: October-19-2015 at 8:37pm |
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I used Grade 8 bolts from FastenAll and it worked well. Get the gaskets from NP or Skidim.
I had to drill out one Allen-head bolt and then use an Easy-Out. I went with the SS bolts and anti-seize / anti-gall Permatex. JQ |
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: October-19-2015 at 8:45pm |
Did you use grade 8 or stainless? I'm confused. |
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2976 |
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Posted: October-20-2015 at 2:13am |
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Pete:
Sorry for the confusion. Thinking while typing can be bad... I used Grade 8 bolts on the risers and stainless Allen head bolts on the exhaust manifolds. I originally got long riser bolts from skidim, but they were Grade 5 and I twisted one off at 25 foot pounds of torque. Yes, I was using the anti-seize, but I didn't expect the bolt to fail. I looked at the calcs for Grade 5 but didn't take the anti-seize lube into account. The Grade 8 units worked well. I bought the Allen head exhaust manifold bolts from skidim and they were stainless. JQ |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: October-20-2015 at 7:43am |
Wow, sounds like the Chinese bolt syndrome!  It's amazing the difference between the dry and lubricated specs. A lot of the OEM manuals list only the dry. Besides the old method of using the Machinist Handbook, It's easy to find both specs on line these days. You're not the only one who has forgotten. 
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Jonny Quest wrote: