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From the jet pump the intake tube goes to a Tee. I guess this is me with nothing better to do.
How to adjust jet boat cooling.
Jet boat cooling system diagram. If you are running a blue printed jet drive in the higher RPM ranges at higher speeds with a lot of power then you are likely to have excessive pressure in the block. The average jet drive can build pressures in excess of 150psi and the engine cooling system is designed for no more than a maximum of 22-25psi. Inboard Stern Drive Cooling Systems And How They Work inside Marine Engine Cooling System Diagram image size 800 X 720 px and to view image details please click the image.
Here is a picture gallery about marine engine cooling system diagram complete with the description of the image please find the image you need. Wisefam22 Here is a link and a diagram to follow. They were relocated in.
It uses the Hardin Marine thermostat kit and a pressure relief valve set to open at 12 PSI. You can get the valve at McMaster Carr for about 50. On my setup I run the water full on unrestricted from the pump.
I prefer to regulate flow prior to the block instead of valves on the dump lines. With this setup you can keep block pressures down and still run proper cooling temps. Exhaust jet boat Have you got the log and snail type exhaust on a Ford chevy or Olds jet engine.
Maybe this schedule one side can help you For a V8 engine you have to put a Y connector on the intake side and depending on the thermostat housing also like my Olds 455. Most chevy Ford engines have a left and right connector. These systems are pressurized just like your car or truck.
By increasing the pressure inside the closed part of the system the boiling point of the coolant is enhanced. For every pound of pressure added approximately 3 F can be added to your engines. Steam jet cooling system is a cooling technique which involves usage of steam and water for cooling purposes.
In steam jet refrigeration systems water can be used as the refrigerant. Like air it is perfectly safe. These systems were applied successfully to refrigeration.
Water comes from the pump bowl which is pressurized. From there it goes to a gate valve and hopefully a pressure regulator which drops pressure down to a lower psi and dumps the excess overboard. The gate valve controls flow and thus engine temperature.
From the gate it goes into the water inlets in the front of the engine. Mercruiser 74l mie whurth gm 454 v 8 1989 1992 closed cooling system parts. Marine engine cooling system diagram is one of the images we located on the net from reliable sources.
Cooling system diagram the engine is much newer than the boat and you have an aftermarket heat exchanger. In this diagram a simple circulation system for an engine. If one is missing the hose then just place it back in the exact way the other is.
Wait till the engine is cool and fill to the full cold line and check the coolant in the engine. Just like a car it will be under pressure so be careful. As far as what kind just use.
Jun 22 2009. I Just bought a jet boat with a 1973 olds 455 Id396021F with a Berkeley 12JG pump. The engine has hardin exauhst manifolds.
My question is how are the cooling lines routed and what temperature thermostat should I. Going to have to take another look at my pressure relief valve and make sure its working. I suspect the orifice isnt big enough and I might need to add a.
I guess this is me with nothing better to do. But it bothered me I couldnt really figure out how the cooling system works in my boat from looking at the service manual did I mention that Yamahas service documentation sucks. So here is a drawing I made based on info from the manual.
From the jet pump the intake tube goes to a Tee. The small tube from the Tee goes to the Water Regulator which is mounted on top of the muffler. The larger hose goes directly to the intake on the head.
There is another hose that goes to the large exhaust pipe. Heck the coolant level of the heat exchanger daily and only when the engine is cool. Generally a good time to do this is just prior to starting the engine for the first time each day.
Heck coolant protection during extreme ambient temperatures. Keep the fuel tank filled. From here two lines run to the front of the headers and one large line radiator hose size runs from the thermostat housing to the water pump runs from where the upper radiator hose would hook up on a car to where the lower radiator hose would hook up.
I had a 2003 350 mag mpi installed in a 32 ft aluminum boat with a keel cooler. The place I had install it said the motor was made to run raw water through it but would be no problem hooking it to the. Hi I am curious if anyone has a diagram of exactly what is happening with the cooling system just so I can really understand it.
I know it is picked up at the pump and comes into the pipe and through the engine etc. But what about the pipe and from pipe to pipe etc. I am just not sure and what about when you hook the hose to it.
I have a 650 X2 system with a PJS pipemani and westcoast. You need to test your cooling system while its in the water running under its own power. If you look at the exploded view find hose 13.
This is at the top of your tuned pipe and is normally tubed to the back of the boat as your tell-tale. On your motor configuration they. Going over the basics on how a jet boat works and using a 1968 Tahiti Tornado as a visual aid.
In my opinion these are the basic solutions for most engine cooling problems for the average jet boat. PERFORMANCE JET can set you up with everything that you need or you do it yourself but remember dont skimp. Buy good parts and do the job right the first time.
Remember your jet boat is supposed to be a pleasure boat. So keep it that way. Now do NOT put in a thermostat.
Not even one of them fancy jet boat bypass ones. The normal automotive ones will blow the cooling water through all your gaskets the jet boat ones can eventually lead to cracked heads. How to adjust jet boat cooling.
Remember the valve gate or ball between the pump and the logs. This is your adjustment.