Nope, don't even know WTF a "sharder valve" is. The 525s are closed cooling and external water is only in the seawater pump, coolers and exhaust. All you need to do is drain the majority of the water out of all of the above, put a 5 gallon pail with about 3 gallons of anti-freeze on the platform with a hose and muffs to the drive, start engine and run it thru. The anti-freeze pushes any remaining water out and fills the entire system in a couple minutes, some don't even drain first but it saves on anti-freeze if you do. If you use the pink stuff you can just launch in the spring and be on your way, with the real stuff you should drain first but you can catch it and use it again the following year. Simple deal.

A shrader valve is basically the same thing as a valve stem it has a little check ball that allows you to push air or liquid through it in one direction. As for the closed cooling system yes I have that as well. Based on the manual you only need to pump out the water (via the valve) and remove all of the plugs incase you don't know what a plug is its those little blue things on the sea pump and a few other places. Sounds like you can get away with out the anti-freeze - like I said I don't think I'll take that chance and stick to the anti-freeze. I'll bet if you look a little closer you have a similar set up. Here's a link to a picture/parts lay out of the water drain system that mine is equiped with.

http://www.mercruiserparts.com/Show_...R+DRAIN+SYSTEM

Anyone else have one of these and do you trust it or use it or just do the anti-freeze like I've been doin?

Ok, but I thought they only used that system on the 4 bangers, never noticed it on the 496s.

I said drain the majority of the water out, via the little blue plugs was assumed to be the way.

And......................then you start the engine and run the anti-freeze thru, via the bucket and muff deal on the drive. Would never just trust draining the system and calling that good. Before the closed cooling I would drain the blocks then pull the T-stat housing and fill the blocks with the good green stuff, then flush it thru all the coolers and exhaust as well. Anti-freeze is cheap, parts ain't.

When you get a chance PM me your address, I have some assorted Velocity chit, no offense, that I'll send you.

Ragged look what you made me do. I got that cool little spinny thing under my name on the posts What ever Velocity Chit you got better be good or I'm sickin mom on you Ooops Chery said I better be nice....... sorry.

whatever happened to twins? seems to have fallen off the map

Ye of little faith, you think I would have half a$$ed chit?

Maybe old Twins fell into a crack and can't get out ?

Likely overwhelmed by the world of ever changing high finance. Seems all the "Financial Guys" are bummed out lately. A little infusion of cash would cure all that ails them, no doubt. Went up to HBW last weekend to grab the refer and dock box and went in to the showroom to BS, asked about the marine finance rates,,,,,,,,,,,,,, 8.99% with a real 20% down was the best deal, up a point from two weeks before. I do believe the days of easy credit for toys have come and gone. Go figure! But then you and I have had that conversation before.

Nope not half a$$ed chit just Velociy Chit Thanks in advance. I guess I'll owe you a cocktail or two or three next time we're out your way. Earlier you mentioned going for a run at the end of Nov. Cheryl and I have been discussing coming out there for Thanksgiving (don't tell Mom or my Sister - we haven't talked to them about it yet) If you don't think the extra weight will keep you from getting that extra 1 , 3 or 4 mph we'll tag along that way you can have third paqrty confirmation on the speeds :-)

I'm still here ..... just lying a little low getting ready for the snowmobile season ..... just put "got twins ?" in storage for the winter.
With regards to Ragged's comment ..... my dealings in the financial business is a little different ...... our customers our feeling the crunch no different then anyone else but with the "Saved by Zero" program offered by Toyota it has certainly helped ......
We are fortunate to have a very diverse line of vehicles to offer .... like Toyota ..... they are still strong as ever with regards to current sales.

Jeff

The sleeping bear is out of hibernation! How are things Twins?

You may have been somewhat "Saved by Zero", but stats say Toyota is in the chitter same as the rest, somewhere around 30% off, so they say. Little different than the old days when they could add the "Additional Dealer Profit" tag under the MSRP and get it.