Merc XR2 Cooling System
I just installed my water pressure gauge in the dash and
hooked it up to my engine (1987 Merc Blackmax XR2 150). I installed a new
water pump. It is pumping out of the back of the engine, the 5/8th hose
that goes out of the back of the cowling, and the piss tube is free of
debris and is pissing very well. Did I take the water pressure from the
wrong place on the engine? I took it from the top, but it is not
registering on idle or high rpms, and nothing is coming out of the water
pressure hose at the gauge. What's up? There are no kinks in the 1/4"
water line. Why do I have no pressure?
Okay, Here is the deal!
There is no
poppet valve, and no thermostats in the engine at all. ??????? Why would
it be this way? I was told that it is an old racing engine. It has 149 psi
on all cylinders. (I checked it 3 times, with different gauges, just to be
sure). At the bottom of the engine on the right side, there is a 5/8"
elbow with a 5/8" black hose. Water is dumping out of this hose
pretty heavy, as well as the piss tube (tell / tale), after I rev it up to
around 2000 rpms.
How can I get water pressure to my gauge? Where else can I
take water pressure from in order for my gauge to show pressure? It seems
very strong and sounds great, but the mods that have been done to it are
nowhere to be found on the internet, so far!
If you know anyone who can help me figure out this thing,
please forward this to them!
would get a service manual for that model and a parts book. Then put it
back to stock. The way it is now is doing you no good. Run a XR2 like they
designed it and your reliability will be much better.
Please submit whatever questions you have to IHRTechTalk@yahoo.com. All questions and answers selected will be displayed on this page as they come in. Note: though all boaters are welcome, priority may be given to I.H.R. members. Randy can not be held responsible for any advice given. Though his information and expertise is second to none, he has no control over what you do with your boat. It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.
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