Engine Block Drains.....
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Engine Block Drains.....

  1. #1
    Senior Member Fireguy's Avatar
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    Default Engine Block Drains.....

    Do you guys drain the water from your block after every trip? Or flush regularly?
    If so, does any one have any cool fittings or drain setups to make it easier?
    Reason I ask is because Im doing some work on my boat engine and the bottom of the head studs are pretty corroded and the block had a bunch of sand in it. I always drained the water out of the race car but the boat.....

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    21 Daytona Outlaw's Avatar
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    Nothing fancy but I drain it after every trip plus flush it out.
    Just some stainless caps at the drains
    And a fitting on the thermostat block off plate.
    I've seen some guys install 1/4 turn valves on the front engine plate
    With lines ran to the block drains.
    #55

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    Super Moderator HammerDown's Avatar
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    I pre-filter the river water before it enters my block = zero sand/debris

    On my block drain holes, I use a simple 1" brass nipple with a screw-on cap...makes it EASY to drain/recapture the blocks antifreeze used from winter storage > I simply stick a 6' length of 5/16 vinyl hose on the nipple and out the boat drain-hole and back into a catch container the antifreeze goes for next winters use.


    Also...spoke to a FelPro rep over a decade ago and what he told me made sense...it is best to keep water in the block as, once the water is drained, the rusting/corrosion process is accelerated. Of course it's not practicle for me to refill my block with water after returning home from the river...so the blocks water-level drains about 1/2 out.
    OP, chevy head bolts/studs are not blind holes, some enter the block water...so rust they will.
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    I have a flatbottom with aluminum heads and after running in certain fresh water rivers, I will hook up a line that goes into a bucket of tap water and run it for about 5 minutes at home or long enough to get it hot in an attempt to slow down the corrosion of the heads. I don't worry about the sand in the block, some will accumulate but not much. I've seen what can happen to the heads though.

    I don't know if it helps, but it makes me feel better.

  7. #5
    Senior Member bp298's Avatar
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    pretty religious about draining/flushing after a weekend. i also use saltaway in the warmup bucket all the time. not sure if it helps, but can't hurt.

  8. #6
    gn7
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    Quote Originally Posted by bp298 View Post
    pretty religious about draining/flushing after a weekend. i also use saltaway in the warmup bucket all the time. not sure if it helps, but can't hurt.
    go to Pep Boys and get Motorhome anti freeze instead, and leave what ever stays in the block in there. Your heads will be happier, and you don't need to flush it next time you go to the water because its biodegradable. They use the stuff in cattle feed, soap, cosmetics, ice cream etc.



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    Senior Member SHAWN DAVIS's Avatar
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    I used some of these ball valves from fastenal, work decent

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    Senior Member SBS933's Avatar
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    I use ball valves, and i open them everytime i take the boat out of the water. Probably overkill, but the previous owner used to keep anti-freeze in it during the winter and it rotted a corner of the head due to corrosion. I had it welded and i drain the block every time now.
    Believe Nothing you hear and 1/2 of what you see.

  11. #9
    Senior Member bp298's Avatar
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    Quote Originally Posted by gn7 View Post
    go to Pep Boys and get Motorhome anti freeze instead, and leave what ever stays in the block in there. Your heads will be happier, and you don't need to flush it next time you go to the water because its biodegradable. They use the stuff in cattle feed, soap, cosmetics, ice cream etc.
    where's pep boys in havasu????

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    Senior Member Rivernut's Avatar
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    Ball valves front and back on exhaust manifolds, one each side of block. I fish all winter with this boat and I only drain it during the winter months after each trip. Don't engines rust quicker if they are drained each trip? More oxygen available and it is wet = more rust than just covered in water.
    Last edited by Rivernut; 04-15-2013 at 06:08 PM.

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    Senior Member Bubbletop409's Avatar
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    I have a Dart BBC block in my Cole and used 1/4 pipe X #6 AN fittings in the block, with a #6 AN cap. Easy to install and use.
    Larry

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