T-Stat ?
06-11-2012 | 09:14 AM
#11
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Joined: May 2012
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Yes, bypass hose goes from front of intake to circulating pump.
Blue hose in the top of the manifold feeds the water pressure gauge.
The springs and check balls have been removed
According to the water pressure gauge as soon as I throttled up the pressure started to climb...15 lbs....I backed off the throttles then.
My housings don't have any plugs in the bottom of them and I'm using the stock merc sea pump, plastic housing.
I do plan on installing the bypass relief valves, still curious why the engines won't get up to 160 degrees. I will recheck with the temp gun and make sure that I'm close to the surface.
Blue hose in the top of the manifold feeds the water pressure gauge.
The springs and check balls have been removed
According to the water pressure gauge as soon as I throttled up the pressure started to climb...15 lbs....I backed off the throttles then.
My housings don't have any plugs in the bottom of them and I'm using the stock merc sea pump, plastic housing.
I do plan on installing the bypass relief valves, still curious why the engines won't get up to 160 degrees. I will recheck with the temp gun and make sure that I'm close to the surface.
If you are interested in trying something, you can install a T fitting on the hose that feeds water to the housing (from the cooler). From this T, place a quarter turn valve. After the valve, place another T. Run both sides of the second T to more Ts placed in the hoses coming from the upper fitting of the T stat housing. With the valve closed, you will be running like it is now. With the valve open, you will be able emulate a larger bypass in the housing or the HiPerf by-pass valve. If you like the results you see, you can go from there.
06-11-2012 | 09:27 AM
#12
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Joined: Jan 2008
Posts: 1,361
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From: Delaware, OH
I would be more inclined to think the stat is not shutting. Is the temp of 130 all of the time or just at high or low speed? If you change the oil on the 130 engine, does the oil pressure come back up? If the block is running 130, then the oil is also running too cold. When that happens, the oil never gets a chance to warm up the condensation (water and fuel) and push it our the crankcase vent system.
This will also affect the fueling system. Both carburetor and EFI (but worse with EFI) will not run properly if the heads are too cold.
This will also affect the fueling system. Both carburetor and EFI (but worse with EFI) will not run properly if the heads are too cold.
Should I go and get a 160 stat.
06-11-2012 | 09:49 AM
#13
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It's running 130 all the time. It warms up to 130 and stays there. I usually only run the boat up to 3k and it stays at 130. I tried going higher rpms on Saturday for a few secs and came back down to 3k. The I felt a loss of power on that motor and the rpms dropped, so I backed her down to idle speeds and that's when the oil pressure dropped to about 10 psi. I shut it off and fired it back up a couple mins later and had good pressure but when I got to PIB it was low again at idle speeds.
Should I go and get a 160 stat.
Should I go and get a 160 stat.
06-11-2012 | 02:35 PM
#14
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Joined: Jan 2008
Posts: 1,361
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From: Delaware, OH
The motor has always lagged behind the other and the oil pres has always been questionable along with water temp. I bought the boat last year and it came with auto meter pro comp marine gauges but same sending units. I had a mech swap the water temp sending unit last summer and since then it been 130 one side and 160 the other. Another mech told me that my oil pres was just backwards, so this summer when I notice the pres getting close to 80 I installed a mechanical gauge and that's when I notice the pres dropping to 10 at idle speeds. So I have know clue what stat is in that motor. I'm going to pick a 160 stat up tonight and then prob swap leads going to the sending units and see if the temps swap on the gauges.
I've had the 130 temp motor out for a trans rebuild and one head pulled off to tap out a broken spark plug. I plan on getting new gauges because I don't want to get knew sending units plus I'm not a fan of auto meter for marine use.
I've had the 130 temp motor out for a trans rebuild and one head pulled off to tap out a broken spark plug. I plan on getting new gauges because I don't want to get knew sending units plus I'm not a fan of auto meter for marine use.
