[hillbilly68]

hey guys got a water question, the PO had it set up like this and i think its wrong and thats the reason i got it hot and cracked the head.
hose comes in from thru wall from jet then comes to tee from tee one hose goes to the 2 headers, now from other side of tee hose goes to water faucet valve (to control water flow) then from valve to water pump out other side of water pump to back out to lake.......... shouldnt the valve be on the hose that goes to headers? water to engine should be full flow right?? anyone please give diagram or explain the proper way the water hoses should be routed...plz

 

[Chris The Plumber]

water lines

How I do them is: water comming from the jet goes to a "T" then feeds the engine block where normally your water pump would go if the engine was in a car, then you want to run a hose from the top of the intake manifold to the back of the boat as a water dump, another hose should be run from another source on top of the intake to the "T" valve for the headers, Make sure you use a exhaust "T" valve made by Basset or Rewarder, they have a check valve in them & will only allow water to the headers at a certain RPM, This is in my opinion the most simple way to plumb a jet boat, there are other ways for example if you are running a oil cooler or Logs, some guys like to preheat the water thru the cooler or thru the logs before it enters the engine block, My rule is keep it simple!!!!!!

 

[hillbilly68]

thanks chris, but i dont have any hoses coming from the top of my intake, the only water inlet/outlet on me 460 is it goes in on one side of the waterpump and out on the other side of the water pump or you know where the wp supposed to be and yes i love simple too. theres a block off plate where the thermostat is supposed to go (no thermostat) give me a second and I will post a pic of it

 

[hillbilly68]

chris here is a pic, as you can see is water inlet on left and then outlet on right

 

[Chris The Plumber]

They sell a housing that goes on top of the intake where your T-stat housing would have been if it was in a car, anyway the housing will have 2 threaded openings where you can screw barbed adaptors into, you will plumb one of these to the dump on the back of the boat & the other you will plumb to the "T" for the headers. also some intake manifolds on the top of them have threaded plugs that can be removed & utilized for this as well.

 

[Chris The Plumber]

plumbing

Ok, point those 2 fittings down & tie them into the "T" that is going to be plumbed in from the Pump, those 2 on the front of the water pump block off will be the feed they will feed each side of the engine to bring water to the cyl.'s.

 

[SoCalKev]

The way I have it set up (460 Ford) Thru Transom Exhaust-



From the jet it leads to a valve where I can control how much water I let thru:
to a "T" that splits the water lines up to that water pump cover you have hilbilly (one goes in the left side and the other goes in the right side as you water pickup.
Them, I have (where my Thermostat would be) is a double opening where I feed one line to each exhaust log.

Also I have another "jumper" hose feeding from the front of my exhaust log to behind the riser in the back.

 

[Turboelimtim]

Mine's a little more complex, but similar. I have a gate valve from the jet, then it T's into the exhaust water jackets, then into the engine water pump fittings, out the thermostat and dumps into the exhaust. I have a pressure relif valve that bypasses water from the engine, through my oil cooler and out through a dump. This way I can set the pressure in the engine to avoid chocolate oil.

 

[Jetaholic]

Just spoke to him on the phone.

Apparently whoever had the boat before had it going like this -

Pump water outlet to T fitting

One side of T fitting ran to a second T fitting that split to the headers (no T valve)

Other side of T fitting to gate valve

From gate valve to left water pump inlet

Right water pump inlet to overboard dump

T-stat capped off with plate. Plate was drilled and tapped for water temp sender.

They were using one water pump inlet as an inlet and the other as an outlet. Informed him that cold water is to split from the pump and run in to BOTH water pump inlets and exit out of the t-stat plate to the overboard dump. Header water would need a T valve instead of a T fitting and can either be plumbed from the pump or one of the bungs on the intake manifold water crossover, but would need a gate valve in between the water source and the T valve.