Proper trailer warm up
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Proper trailer warm up

  1. #1
    I'm No Expert Shaun's Avatar
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    Default Proper trailer warm up

    So, i try to fire the engine up once a month. I also run it before a river trip. Whats the proper way to build heat in the engine on the trailer. It takes a while for my water temp guage to even register heat, i've wondering if i should slow down the water from the hose to allow the heat to build faster or if this is a bad idea?

    This is my proceedure (right or wrong)..

    1. Turn the hose on so that i get about a 6" stream of water out the back.
    2. Fire the engine, bring the rpms up to 2K for 5-10 seconds.
    3. Idle for a 5-10 minutes, brining rpms up to 2K-3K for 5-10 seconds here and there.
    4. Few Waps here and there.

    When sticking my hand on the head it takes quite a while to feel heat in them. water temp guage also bearly shows anything twords the end of the run.

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    Loose Nut on the Wheel michaellone's Avatar
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    When I am putting heat in th motor in the pits I use a 5 gallon bucket, slide a rubber hose on the pickup to the bucket, and hang the bucket below the water outlet. Fire the motor, 1200-1400 rpm for a few seconds until the motor will idle, then let it idle until I have 150 on the gauge. This is with a Magnaflow pump and Rex's Marine thermostat.

    If you don't have a thermostat from Rex, get one. I swear by them.

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    gn7
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    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by gn7 View Post
    Just run it until one of the neighbor shows up with a gun
    Lol, bob, i'm not in that same neighborhood anymore. I moved about a mile down the street. I have yet to fire it for the new neighborhood, should be sweet too, it's a culdasack with hills all around it!

    I've though about doing the bucket deal for pit warm-ups (if i ever get to that point...), it's a jet so i would need a water pump, when setting up the boat i did put AN fittings on both the inlet and outlet for this purpose. Should be a easy connect/disconnect.

  7. #5
    Senior Member bp298's Avatar
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    what i do for driveway starting.
    set the boat so it has the same slight nose up attitude it has when it's sitting on the water.

    if it's not level side to side, i use a floor jack to raise one side of the trailer until it the engine's level (i use the digital protractor for that). at some tracks, pits are like that and i'll jack it up there too.

    i hook up the water hose upstream of the pressure regulator and turn the water on a couple turns.
    if there's no regulator, or the hose connection is downstream, i turn the faucet on about 1/2 turn or less, wait for the engine to fill and vent.

    i'll run the engine for 10-15 minutes, at least until the heads are nice and toasty to the touch. usually, at that point water outlet temp is around 140 or so. if water outlet temp is climbing too quickly, open the faucet a little more; if it won't move, close it down a bit. if inlet water temp is cold, like 50ish, you don't need much flowrate.

    for pit warmup, the 5 gallon bucket works fine. get a decently sized bilge pump, add some long wire and aligator clips to hook it to your batt. the pump i use is a bit overkill, 2200 gph, but i want at least 1100 or so - lots of guys get by with less.
    i replaced my dump fitting with an AN bulkhead connector, and have a hose hooked to it to return to the bucket.

    again, inlet water temp and atmospheric conditions are going to dictate how long you either need to run it, or can run it.
    i've used a 15 gallon tub many many times over the years. reason being, i'm trying to heat engine components, not water, and in some conditions (like marble falls, 100F with 50+% humidity), that water get's dam hot dam quick, and it never cools down. i've seen guys running engines on the bucket with steam coming out of the overboard, and i don't care to do that.

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    I'm No Expert Shaun's Avatar
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    I figured i needed to slow down the water alittle bit, just wanted to make sure i wasnt going to hurt anything by doing this. I guess the main idea is to watch the water temp and if it's getting too hot i need to speed up the flow a bit, or in the case of a bucket, get a bigger bucket.

  9. #7
    Senior Member Morg's Avatar
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    Non jet guy questions hear:

    Is there packing or seals in the jet pump that will overheat without water flowing?

    Seems like the guys with removable drive lines take them out in the pits for warm ups??
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  10. #8
    I'm No Expert Shaun's Avatar
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    I have a jetaway so i can switch the jet into neutral and not have to worry about that.

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    Senior Member fleetimus's Avatar
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    Morg,

    You are correct in your assumption. Most jets that warm up on the trailer do or should disconnect. Many of the boats have a Jet a Way that disconnects the pump from the engine.

  12. #10
    Senior Member bp298's Avatar
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    Quote Originally Posted by Shaun View Post
    I guess the main idea is to watch the water temp and if it's getting too hot i need to speed up the flow a bit, or in the case of a bucket, get a bigger bucket.
    you shouldn't have a problem with a 5 gal bucket where you live, or in spring/fall months. also, it is important to eyeball a bucket, just to make sure the water coming out of the engine is still going into the bucket, and not somewhere else on the ground.
    the other thing about a bucket or tub is that you don't want the water getting way way hot, like 180-200, close to steaming. getting the water that hot isn't making your engine better, and it'll wear out a good bilge pump before it's time.
    i've been in marble falls with the 15 gallon deal, warmed it up in the morning getting the water up to like 130-140 (and that happens very quickly back there). put your hand in that water 4 hours later, and it's still dam hot. hook the water up after a pass to try and cool it a bit, nothing gets cool. the only thing to do is dump it, get some cooler water, and then that heats up too quickly. you just acclimate to it.

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    i have seen guys use a 5 gallon bucket that has a 12 volt pump mounted to the bucket to pump water into the engine and catch the overflow in the bucket.

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