newbie HELP cooling prob!!!

[REDJIM78]

PLEASE can someone help
just been given two boats 1 is over 2ft long and the other is just under 4ft
they both have irvine os max engines a 20 and a 40.
got the small boat running but gets hot quick.
the water pickup is just behind the prop about an inch and shaped like a J.
the engine has 1 inlet and 1 outlet in the head and the back of the crankcase also has the same. there is also an outlet in the rear of the boat.
how do i pipe it up ????
the exhaust has a pressure nipple on it does this only presurise the tank???
or is this part of the cooling system????
ive tried the obvious way i think but dosnt seem to push any water through the rear outlet.

[bufferoo]

Think of the water fitting at the back of the boat (j shaped) as the inlet. The water goes in there, into one of the fittings on the head (doesn't matter which one), out the other fitting and then out the water outlet on the rear. If this is how you have it plumbed (with new lines) and are still not getting any water through you may have two problems.

1. Either the inlet or outlet is plugged.
2. The head is corroded inside and needs to be cleaned.

Just to be safe you should check both. Always remember that it will take a certain amount of speed to get the water flowing enough to cool properly. Running around at idle might not do it for you.

The fitting on the muffler or pipe is to pressurize the fuel tank. It would go into the fitting on the tank that exits at the TOP of the tank and the fuel will exit the tank from the bottom. Idealy your fuel system will be a closed loop without a vent in the tank.

Bufferoo

[lovinnitro]

Are you seeing any water exiting the cooling head when you run? if not Bufferoo I think has it. fastest way to tell is disconnect the tube from the J inlet and blow through it you should be able to blow it past the head. If so then hook it back up and blow through it from the side that connects to the heaqd. You should be able to blow through it as well. If your getting water out the exhaust tubing you may be too lean on the needle setting.

You say there are two other outlets on the crankcase? I'm not sure about that. One of the nitro gurus here will probably be able to help on that.

[Hydro Junkie]

You say there are 4 fittings on the engine? I got the two being on the cooling jacket, are the other two by the exhaust or down at the bottom of the engine block? If they are by the exhaust, they are also cooling fittings. If they are down by the bottom of the block, they are probably pressure taps for a water pump or something like that. If you could post a pic of the engine, it would be easy to tell

[REDJIM78]

the pics are bad but they show what i mean. i hope!!

[REDJIM78]

complete engine.
the exhaust pressure out let is on the side of the header towards the back.

[Hydro Junkie]

Looks like it had a water pump and something else hooked up to the engine. If you can find some SHORT SCREWS, you can plug them. Another option is to put a piece of fuel tubing between them as a jumper. I'm sure some of the others around here will have other suggestions for you too

[REDJIM78]

ive just blanked off one outlet and sucked on the other and it sticks to my tongue. so there is no leaks there. looked inside and theres just a plate recessed into the block.
no pump of any type on the back of it.
could it be just another cooling jacket but just for the block????
LOVINGNITRO also said that if i get water out the exhaust im too lean on the needles.
but there is no water connection on the exhaust or carb how would this happen???
have had it running but didnt blow any water out of the stern outlet or exhaust. it just got hot so i ran it up with a washing up bottle connected to the water pipes and kept squeezing when it was running!!!! worked well for a minuite!!!!!!!

[BoatDoc]

HJ is right, you may just want to block off those holes. if you want extra fuel pressure, you can block one and use the other to pressurize the fuel system instead of getting pressure off the exhaust.

[bufferoo]

I think you may be right. They might just be a cooling backplate. I know that there are special backplates for car & buggy engines that are finned to allow that area to give off more heat to help cool the lower end of the engine. I would try taking off the backplate and taking a quick peak. Adding that area into the cooling cycle might just help you some.

Bufferoo

[REDJIM78]

but will the input have enough power to push water around all the system?
it seems the input is very small! will this be adiquate to cool it ?
the hole is only 3-4mm wide

[lovinnitro]

"LOVINGNITRO also said that if i get water out the exhaust im too lean on the needles"
You misunderstood me. I said that if you are getting water out of the exit side of the head you may be running to lean and maybe that's why it's getting hot. Is it running ok and getting hot or running bad and getting hot? you could also rig up a milk jug or such run a piece of tubing from it to you head. get the jug about 2'-0" above the boat and gravity should push water through the head to make sure your getting water at least through the motor. Did you check the j bend to see if it was clogged?
I might be wrong here but the only two ways I see a water cooled motor heating up is no water to cool it or too lean.

[BoatDoc]

i was cruising e-bay looking for a new project and saw a very similar engine. the seller said that those fittings on the back are for the water pump. just an idea.

[REDJIM78]

boat doc
can you find the item no for me please
thanks
jim

[REDJIM78]

totally brill !!!!!!!!!!!!!!
got the small boat running in the kids paddling pool just.
water started comming out of the outlet in the rear of the boat!!!
well happy !!!!
seems to be running cool too!!!
I just need to know what settings are the needles?
im not familiar with theses carbs but im not new to nitro .
thanks everone for your help.
now trying to get thing to stay running so i can try it on open water.
LOVINGNITRO: SORRY dumb moment!! i re read the post and yep you were right i read it wrong !!! DOH !!!
Im now going to try and get the big 40 running !
bet your life i will be back asking questions within a week !!!!lol lol
THANKS AGAIN PEEPS
JIM

[BoatDoc]

there isn't a lot of info about the motor, but here's the item number from e-bay

Item number: 5924545875

[lovinnitro]

I think Jim a good rule of thumb is 2 1/2 out on the needle if I'm not mistaken.
However that is only a starting point. you'll have to play with it to get it running the best and still staying within a decent heat range just like your other ones.

[REDJIM78]

DOC !!!!!
thats the same engine as mine but my lunp is a 20.
tha other is a 40 but tried to fire that up and major probs!!
heads not sealed water flies from the jacket and fuel from the head it will start and run but for 10 secs, somthing to do i suppose!!!!
LOVINNITRO!!
tried that and seems a good medium it pushes the water out of the kids pool so that must be a good sign plus it stays well cool!!!!!!!!!!!!!!!!!!
will try bidding on the engine, at that price it worth it!!!
thanks peeps!!!
jim