drip off exhaust manifold |
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flyweed
Gold Member Joined: July-11-2016 Location: WI Status: Offline Points: 544 |
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Posted: June-24-2021 at 3:22pm |
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Hey guys
my old girl needs a little attention. Today after a morning on the lake I Notice a tiny/slow drip off the bottom of the exhaust manifold near the rear. At first I thought it was the manifolds drain cap just not tight enough and dripping a bit. Upon further inspection, on the under side of the manifold there is a little rust spot an inch or two foward of the drain cap. Question..should I bother pulling the entire manifold off and replacing it at this point, or dry it good, flapper disk the area and put some JB weld on and finish out the season? In the meantime I am going to look around for a PCM exhaust manifold to replace it with. Any thoughts? Thanks |
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'93 Ski Nautique NWZ, Air Boom Tower
Drink Tonight..for tomorrow We Ride! |
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desertskier
Platinum Member Joined: December-19-2006 Location: Az Status: Offline Points: 1115 |
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I would pull the spark plugs on that side and make sure there is no water intrusion into any of the cylinders. I replaced both manifolds and risers last year for a similar problem.
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92 SN - Owned since 93
99 Pro Air 89 SN - Went to live on a lake in Texas 75 Donzi 16 - Sold in 93 |
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flyweed
Gold Member Joined: July-11-2016 Location: WI Status: Offline Points: 544 |
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did that, and there is no water intrusion into the cylinders, cylinders and plugs are fine In fact I just did an oil change as well, all looked OK. It's a very small water drip off the bottom of the outer edge of that manifold.
Dan |
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'93 Ski Nautique NWZ, Air Boom Tower
Drink Tonight..for tomorrow We Ride! |
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desertskier
Platinum Member Joined: December-19-2006 Location: Az Status: Offline Points: 1115 |
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JB it for now. But it sounds like new manifolds and maybe risers are in your future. I went with new everything just so I didn't have to worry about it.
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92 SN - Owned since 93
99 Pro Air 89 SN - Went to live on a lake in Texas 75 Donzi 16 - Sold in 93 |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11118 |
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Flyweed
Speaking of JB Weld, how's that rudder of yours holding up?
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flyweed
Gold Member Joined: July-11-2016 Location: WI Status: Offline Points: 544 |
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Ken- JB weld on the rudder is holding up like day 1. no more cavitation, and no deterioration on those areas.
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'93 Ski Nautique NWZ, Air Boom Tower
Drink Tonight..for tomorrow We Ride! |
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flyweed
Gold Member Joined: July-11-2016 Location: WI Status: Offline Points: 544 |
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Sean...Yeah, the rust spot is small, and the drip is tiny. It's almost July, so I think I'll use a flapper disk to remove the rust, then put some JB weld on it and call it good for this summer. This fall when I bring it home, I'll pull the exhaust manifolds and risers and replace. They aren't super expensive, but places like Nautique Parts and SKiDim are currently on backorder for them. So I am going to place the order now, and hopefully they'll arrive sometime this summer.
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'93 Ski Nautique NWZ, Air Boom Tower
Drink Tonight..for tomorrow We Ride! |
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flyweed
Gold Member Joined: July-11-2016 Location: WI Status: Offline Points: 544 |
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Ok, so question about manifold removal. How easy (or not) is it to get the bolts out to remove the exhaust manifolds? Mine are not rusted at all, but I'd say it's highly likely they have never been removed.
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'93 Ski Nautique NWZ, Air Boom Tower
Drink Tonight..for tomorrow We Ride! |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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If they are that clean they should come off with no trouble but you know that goes,maybe start lubing them now . On mine the socket heads are heavily corroded,why didn't these knuckle heads use stainless?? - I don't even want to touch them..... When you get the new ones check the mating surface between the manifolds and risers right when you get them. I got some last fall which had a casting flaw- I lost a couple of more weeks straightening that all that out.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11118 |
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You never know till you try I'd try loosening and retightening them one at a time during the summer while the engine is hot.. The PCM torque spec was 18-24 ft lbs just to give you an idea how much force it should take to loosen them. At least then you'll know if it's gonna be an easy job or not. PS I bet you're kinda glad you didn't fork over the bucks for a new rudder now and maybe you still have some of the JB Weld hanging around.
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flyweed
Gold Member Joined: July-11-2016 Location: WI Status: Offline Points: 544 |
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Ken. Yep JB weld for now, and replacement of exhaust manifolds in the Fall!
Gary, not sure why they don't use Stainless. I assume it's because of "softness" or "hardness" I'd imagine Stainless is probably softer than say a Grade 8 bolt. |
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'93 Ski Nautique NWZ, Air Boom Tower
Drink Tonight..for tomorrow We Ride! |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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A socket head cap screw is actually a grade 8.8 which has a tensile of 170,000psi. The only stainless SHCS that comes close is a grade A286 at a tensile of 120,00psi BUT, at roughly $15.00 each I doubt anyone would use them. 18-8 and 316 grades of SS SHCS come in at 70,000psi so maybe strength does come to play?
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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I'd be willing to bet that they didn't use socket head cap screws for their strength but for their clearance,try fitting a regular bolt in there. Many vintage engines even used those double thick brass nuts with studs and they worked. PCM chose steel over stainless because they were cheaper. The very same reasons auto manufacturers deleted differential drain plugs,radiator drains,block drains,transmission drains etc. Saving a dollar here and there adds up.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11118 |
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So Pete...... I'm mildly confused here You're presumably talking about a metric cap screw since you're throwing around terms like Grade 8.8 ( which is actually Class 8.8) Or are you talking about an SAE threaded cap screw that would have a Grade number assigned to it and there is no SAE Grade 8.8 Or are you mixing together SAE and metric terminology. How does a Class 8.8 metric bolt compare to a good ole' American Grade 5 or a Grade 8 Unconfuse me
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11118 |
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Here's what PCM sells these days for Ford exhaust manifold bolts
Will ya look at that,,,,,,,,they're stainless steel and the price isn't terrible Maybe Pete will tell you everything he "knows" about their tensile strength, maybe you shouldn't worry about it and just use them if you want to
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flyweed
Gold Member Joined: July-11-2016 Location: WI Status: Offline Points: 544 |
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well look at that. Damn. I see that SkiDim also offers a full set of replacement bolts, gaskets, plus brass fittings, caps etc for $129, enough to do both sides.
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'93 Ski Nautique NWZ, Air Boom Tower
Drink Tonight..for tomorrow We Ride! |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11118 |
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You'll also need a pair of exhaust manifold to head gaskets instructions whenever you put new manifolds on. You might get to reading the SkiDim description of the exhaust gaskets that tells you to install the gaskets with the shiny metallic side toward the engine and the felt side toward the manifold. And it sure looks like a FelPro number stamped into the gasket they sell.. Then again, you might read some FelPro gasket installation instructions for their MS90000 SBF exhaust gaskets (or any of their metallic faced on one side exhaust gaskets) that tell you to install them with the shiny side out towards the manifold Who you gonna believe? Does it really matter which way they go? You probably have months to think about it, but I'd look at what you take off and if in doubt go with instructions from the people who make the gaskets Edit.............a number of years later..........SkiDim changed their wording to agree with FelPro's wording |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Which way to face the gasket? From the Felpro instuctions: Logical with our cast manifolds?
"When installing Fel-Pro exhaust manifold gaskets, if there is a smooth, metallic side and a composite side, the metallic side should be installed facing out, meaning toward the exhaust manifold. This smooth surface of the shiny side will allow the flange of the exhaust manifold to slide as it expands and contracts during heat cycling from engine operation."
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11118 |
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So are you agreeing with the Felpro instructions or questioning them with your question quoted above Pete? Of course it's logical Look at all those cars and trucks out there with cast manifolds
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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What I see is a 10 dollar price increase in 12 hours to an already inflated price for a handful of rebranded bolts, 4 gaskets and some miscellaneous parts you already probably have.
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gun-driver
Grand Poobah Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4127 |
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