Trans cooler dumps
#1
Registered
Thread Starter
Trans cooler dumps
I'm trying to figure out the best way to dump my trans cooler water overboard. They are 3/8" hose. I see 3 options:
1. Send two 3/8" through hull dumps out the sides of the boat. Would be able to use much shorter through hull fittings.
2. Send two 3/8" through hull dumps out the transom of the boat. I would need to find a spot that doesn't dump all over all of my rigging just to keep things cleaner?
3. Send one 3/4" through hull with a tee out the transom. I'm not sure if these would fight each other and if one motor had a litlte more pressure than the other, it could it prevent the other from draining.
I'm leaning toward number 1 but am worried you guys are going to say it will look like a jetski or something
1. Send two 3/8" through hull dumps out the sides of the boat. Would be able to use much shorter through hull fittings.
2. Send two 3/8" through hull dumps out the transom of the boat. I would need to find a spot that doesn't dump all over all of my rigging just to keep things cleaner?
3. Send one 3/4" through hull with a tee out the transom. I'm not sure if these would fight each other and if one motor had a litlte more pressure than the other, it could it prevent the other from draining.
I'm leaning toward number 1 but am worried you guys are going to say it will look like a jetski or something
#2
Registered
I dump everything overboard off the side . Like you said shorter fittings and easier to access.
Once in a while you might get a question on why are your bilge pumps running all the time? lol
#3
Platinum Member
Platinum Member
ICD, are dumping any intake water ? I'm going to dump two -6 per intake to relieve the hot water issue in the rear of the intake
#4
Registered
I recall that the side of the outlet was important on a trs transmission cooler. My boat has smaller fittings for the discharge. I can take a picture tonight for you. But its defiantly less than 3/8 fitting. My boat is all original with merc2 transmissions.
#5
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Thread Starter
Slpcamaross97,
I understood the in and out to not matter on merctrans so would be interested in learning more. Makes sense to me that you are just running cool water through a set of internals to cool the oil so direction probably shouldn't matter? The lines on the in and out on the trans are 3/8" so I'm assuming 3/8" would be the dump.
Tom
#6
VIP Member
VIP Member
Here the way I ran them , my boat has merctrans, I ran the dump above the drives now they pump water on the drives as a drive shower.
Last edited by cig28; 02-25-2019 at 06:41 PM. Reason: add
#8
Registered
^^^ you`d have to have higher pressure in the block then the headers.. otherwise there will be no water flow. Isn`t the pressure the same in both?
I have two -4AN dumps above the drives.
I have two -4AN dumps above the drives.
#9
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That's what I thought at first, it would flow a little, just enough to get rid of the hot spots. I actually put restrictors in the black hose (1/4" drill holes) because the back of the intake and heads ran noticeably colder. I guess path of least resistance, it's pretty much open atmosphere in the tails with a vacuum pulling the water out the pipe.
Last edited by Rookie; 02-25-2019 at 08:31 PM.
#10
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Thread Starter
Interesting option but I can't figure out what kind of fitting will be long enough to go through the transom. Do you know what -4an fitting you used? Some kind of bulkhead mounted fitting?