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2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggestions
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Author:  Hounddog [ June 3rd, 2014, 11:23 am ]
Post subject:  2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggestions
Motor has lots of water flow. Temperature gauge is half way up. Fine until you get on it for awhile and then temp goes up. Wonder if this is normal. Should I replace the thermostats with washers. I replaced the thermostats already thinking they were the problem. But it made no difference.
SUGGESTIONS!
Author:  LittleCharger [ June 3rd, 2014, 11:53 am ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
Water pressure guage.. what kinda pressure are you actually getting? I had the same issue put a water pump kit in it and cleared it all up
Author:  DoktorC [ June 3rd, 2014, 12:12 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
LittleCharger wrote:
Water pressure guage.. what kinda pressure are you actually getting? I had the same issue put a water pump kit in it and cleared it all up


Gasket blown out of the water pump maybe...or...base gasket under the motor?? totally guessing here lol.
Author:  p man [ June 3rd, 2014, 12:19 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
If the motor is a 2.4XR4 on a drag mid with 1 piece adaptor plate I believe there are some cooling mods that have to be done.
I think you need to reduce the size of the dumps inside the plate
Author:  Hounddog [ June 3rd, 2014, 1:04 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
Motors is a 2.5, has all new Drag large tube water pump.
The pressure gauge is approximately 5 lbs.
When both water dumps open there is lots of pressure.
Author:  Jeff Yammer [ June 3rd, 2014, 1:08 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
Hounddog wrote:
Motors is a 2.5, has all new Drag large tube water pump.
The pressure gauge is approximately 5 lbs.
When both water dumps open there is lots of pressure.


5lbs at WFO ?
Author:  Supermitchie [ June 3rd, 2014, 1:36 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
1) Fill the big dump holes in the one piece adaptor and redrill them th 15/64"

2) Replace the thermostats with 1/16" fender washers.

3) Install diverters under the heads.

4) Does it still have a poppit installed?
Author:  p man [ June 3rd, 2014, 3:13 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
I think Mitch is on to something :O

The XR4 is a 2.4L am I wrong?
regardless it is my understanding that any fishing type steel bore motor will require some adaptor plate cooling mods to run on a one piece place.
Author:  Hounddog [ June 3rd, 2014, 3:15 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
Supermitchie wrote:
1) Fill the big dump holes in the one piece adaptor and redrill them th 15/64"

2) Replace the thermostats with 1/16" fender washers.

3) Install diverters under the heads.

4) Does it still have a poppit installed?
...............YES it still has a poppit installed. Water dumps out one side only and then both sides when it opens.
Author:  Hounddog [ June 3rd, 2014, 3:28 pm ]
Post subject:  Re: 2.5 150 XR4 Mercury on 15" Drag Mid runs hot ...suggest
p man wrote:
I think Mitch is on to something :O

The XR4 is a 2.4L am I wrong?
regardless it is my understanding that any fishing type steel bore motor will require some adaptor plate cooling mods to run on a one piece place.


The XR4 is a 2.4L am I wrong?
You are likely correct. Dryland was surprised when they rebuilt it that it was a 2.5. I got the motor as a basket case.
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