Risers, Manifolds and V-Drive

[Gramps]

How many years is everyone waiting before putting in new manifolds and risers? My engine is running at the same temps it was brand new, I have closed cooling but do run in brackish water. I flush after each use and do not see any visual leaking from my risers but I am curious. Boat is 03' SANTE

What about my V-drive, how many hours, years before it will actually need to be torn apart and serviced? I have heard 5 to 7 years but that just doesn't seem long enough. My boat has less than 450 hours on it and I know I wouldn't tear apart my car or truck tranny with low mileage or hours.

Any input from experience would be great.

Thanks in advance

[DanielC]

RE: Risers, Manifolds and V-Drive

My 1997 Ski Nautique has 2221.3 hours on it. I have not replaced manifolds, or any gaskets in them. I drain it for winter layup, do not use antifreeze in it, I leave it open.

[WakeSlayer]

RE: Risers, Manifolds and V-Drive

My riding buddies 99 SAN with a 502 has ~1250 hours on it. No such repairs have ever been done to it.

I would not not touch any of that stuff until you need to.

[jward]

RE: Risers, Manifolds and V-Drive

Gramps, if you just want piece of mind. Take the risers off and just replace the gaskets. I did this o an 03 san that I had. the boat had been run in salt water and one of the mechanics at white lake suggested this to me. You will get a real good idea if you need to replace anything. Really easy to do. Just go slow taking the bolts out. Scrape the old gaskets off and replace with the new ones. There is some adhesive stuff that they told me to use when replacing but I don't remember what it was called. It was red and you just paint it on and bolt it all back together. I did do a little clean up on the inside of my risers. there was some rust build up but nothing too bad. It did help me to sleep at night though.
Good luck.

[AirTool]

Re: RE: Risers, Manifolds and V-Drive

There is some adhesive stuff that they told me to use when replacing but I don't remember what it was called. It was red and you just paint it on and bolt it all back together.

Indian Head ??

[jward]

RE: Re: RE: Risers, Manifolds and V-Drive

Found it in the garage. It's called High Tack. Comes in a small can with a brush on the cap, kinda like pvc glue or cleaner. If you use this stuff, make sure you cover everything in the boat. If a drop of it gets on anything it is not coming off.

[east tx skier]

RE: Re: RE: Risers, Manifolds and V-Drive

I was told to use aviation gasket sealant when I did it on my old boat. Picked it up at NAPA. Worked like a charm.

[jward]

RE: Re: RE: Risers, Manifolds and V-Drive

probably about the same thing. High Tack IS a gasket sealant

[AirTool]

RE: Re: RE: Risers, Manifolds and V-Drive

OT:

Nice gasket sealent selection chart.

http://www.permatex.com/documents/Ga...ngSelector.pdf

[bobchris]

high tach really isn't needed for this application, You should be setting the riser down and not slidding it around to line it up. all you need to do is place the gasket in the correct postion then have the blots hang from the riser as your installing it to use a guide to line it up correctly, pretty easy job once you get the bolts out.

[gnford]

I have a 95 Gt40 Pro Boss that had no external rust on the manifolds, no overheating, running hotter or any other obvious issues. It ran and looked great. I went to start it one day and the engine siezed. I had to do a complete rebuild ($6,500) as the manifolds had leaked into the pistons. I highly recommend changing the gasket and looking at the risers for internal rust!

[gride]

i plan on just using indian head on the bolts, not the gaskets. is that kosher?

[crobi2]

When I did my riser gaskets I couldn't help but use silicone on them even though they are "self sealing".

I also used never seize on the bolts.

Everything looked brand new when I took it apart.

I did it because I had the telltale streaks down the manifold from the riser joint.

Make sure you put the blocked part of the gasket toward the overflow side.

[ski4evr]

Check the temperature rating on the Indian Head, don't think it is designed for applications near combustion chamber.

[scarbs]

Just changed the exhaust manifolds, risers, and gaskets on my 1999 SAN with 1000 hours. Fresh water only. Temps were always fine, but it wasn't running right and took a few extra turns over to start. Took it in and the chambers had just barely rusted through allowing water through I to the pistons. Fortunately, I caught it in time. Compression and other tests confirmed all is ok with engine. Best to open it up and look.