[Wiley]

I noted recently, that I had not changed the coolant in my Majesty in quite some time. I decided to do that. However...
I now have another problem;
I unscrewed the wrong "Drain" screw on the engine. Not realizing it till too late. To make matters worse, I stupidly decided to push a little air with a compressor down the radiator cap tube, to squeeze out all the old coolant, since it had been a while since the last time I did it. Well...
Now my engine will not circulate new coolant, and runs 'hot.'
I could use some advice from you more mechanical folks out there on what the problem may be. I've checked for blockage in tubes as best as I could, and so far have found none. The pump looks good. So the only possibility that I can see left, is that maybe I've damaged the 'thermostat' with the backpressure?
Any suggestions or advice would be most appreciated!
Seeing as how the dealerships do not want to service what they sell after 10 years.

 

[Roland Donnell]

When you were refilling the coolant at the radiator did you open the air bleed screw on top of the cylinder? If you did not an air lock occurs preventing coolant from filling to capacity. .

 

[Roland Donnell]

The allen head bleed screw is located inside the top left corner of the opening after removing the ABS plastic spark plug cover access. Do not remove the screw. Keeping the radiator full, loosen then turn (CCW) until coolant flows freely from the drain tube and no bubbles are discharged. Then reseat without over tightening.

 

[Wiley]

When you were refilling the coolant at the radiator did you open the air bleed screw on top of the cylinder? If you did not an air lock occurs preventing coolant from filling to capacity. .

I just found out that I had the wrong screw opened. So I'm going to try again and see what happens.
Thank you!

The allen head bleed screw is located inside the top left corner of the opening after removing the ABS plastic spark plug cover access. Do not remove the screw. Keeping the radiator full, loosen then turn (CCW) until coolant flows freely from the drain tube and no bubbles are discharged. Then reseat without over tightening.


View attachment 14686

Well, sigh, I did remove it but, have since replaced it. Stay tuned, I may have a thermostat to replace.

 

[Wiley]

I just found out that I had the wrong screw opened. So I'm going to try again and see what happens.
Thank you!

Well, sigh, I did remove it but, have since replaced it. Stay tuned, I may have a thermostat to replace.

The allen head bleed screw is located inside the top left corner of the opening after removing the ABS plastic spark plug cover access. Do not remove the screw. Keeping the radiator full, loosen then turn (CCW) until coolant flows freely from the drain tube and no bubbles are discharged. Then reseat without over tightening.


View attachment 14686

The allen head bleed screw is located inside the top left corner of the opening after removing the ABS plastic spark plug cover access. Do not remove the screw. Keeping the radiator full, loosen then turn (CCW) until coolant flows freely from the drain tube and no bubbles are discharged. Then reseat without over tightening.


View attachment 14686

Well, Ok, I'm not the brightest bulb in the closet I guess. Here is the latest dilemma...
I did, "remove the drain screw" before seeing your notation saying "not to remove it," just to loosen it. Ok...
I replaced it, put antifreeze into the radiator, and noted that it did fill as per the instructions in the shop book. I then started the engine to see if it was going to heat up to the "Normal" position this time, rather than "Over Heating." Now...
I've got a new problem:
That clear "Drain Hose" connected to the Thermostat Housing, started leaking coolant fluid once the engine warmed up. The Temp Indicator did stop at the "Normal" setting. But since liquid had started leaking from that Drain Hose, I do not know how long it will stay there.
At this point, I can only guess two potential problems; (Not knowing what the purpose of that drain hose is, on the thermostat housing, "other" than for draining coolant for replacing from time to time.)
1. The "O" Ring seals on the Bleed Screw are 'shot,' and need replacing. Or....
2. The Thermostat has failed, and that Hose allows coolant to exit, rather then allow the water pump to develop to much backpressure.
I can order a new Bleed Screw and O rings. But...
I'm not sure now if the Thermostat should be replaced too?
Would you, or another person on this site have any idea of what all that drain hose is supposed to cover on the thermostat housing?

 

[Roland Donnell]

Review this link from this site for a good run down and images.

Changing the engine coolant

I just replaced the coolant in mine. The manual says to remove all sorts of body work, but it can be done much simpler. Pics at the bottom! (boy is my bike dirty...) There are four locations you need to know about: 1) The radiator cap which is located under a removeable bottom in the...

www.majestyusa.com

Well, Ok, I'm not the brightest bulb in the closet I guess. Here is the latest dilemma...
I did, "remove the drain screw" before seeing your notation saying "not to remove it," just to loosen it. Ok..

May be some confusion on terms.
The drain screw is removed for draining the old coolant
The vent screw is for venting the air trapped in the upper part of the cooling system (by the thermostat). After loosing the vent screw is advanced CCW with your allen wrench until fluid starts to trickle out of the plastic tube, then closed. Make sure to keep the radiator topped off when venting.
If the temperature gauge is in the normal position after warm up, the thermostat is ok.
.
I replaced it, put antifreeze into the radiator, and noted that it did fill as per the instructions in the shop book. I then started the engine to see if it was going to heat up to the "Normal" position this time, rather than "Over Heating." Now...
I've got a new problem:
That clear "Drain Hose" connected to the Thermostat Housing, started leaking coolant fluid once the engine warmed up. The Temp Indicator did stop at the "Normal" setting. But since liquid had started leaking from that Drain Hose, I do not know how long it will stay there.

The leaking from the "venting screw" drain tube may simply be residual coolant trapped in the plastic tube after you closed "tightened" the vent screw. Probably a few drips for a day or two but not continuous. If drips do not stop its possible there is debris on the O-ring. I have two Majesty's with multiple coolant exchanges and have not encountered this issue yet. If reoccurring it may simple be a bit of foreign debris. Remove the vent screw and purge the opening with a little compressed air or a shot of plastic safe electronics cleaner. Insert and apply a little silicone grease to the o ring. Replace vent screw.
The water pump does not create the working pressure in the system, only flow. Pressure in the cooling system is an effect of heating the coolant. The PSI rating of the radiator cap determines maximum system pressure.

At this point, I can only guess two potential problems; (Not knowing what the purpose of that drain hose is, on the thermostat housing, "other" than for draining coolant for replacing from time to time.)
1. The "O" Ring seals on the Bleed Screw are 'shot,' and need replacing. Or....
2. The Thermostat has failed, and that Hose allows coolant to exit, rather then allow the water pump to develop to much backpressure.
I can order a new Bleed Screw and O rings. But...
I'm not sure now if the Thermostat should be replaced too?
Would you, or another person on this site have any idea of what all that drain hose is supposed to cover on the thermostat housing?

 

[Wiley]

Well, that drain tube started pouring quiet a bit of fluid out. Even though the screw was all the way in and thumb tight in torque.
Hence why I asked if that tube was also some sort of pop off valve?

 

[Wiley]

Oh, oh, think I just found it.
I let the engine cool down.
Was quiet a bit of fluid leaked out.
Pulled the drain screw.
One, of the two tiny "O" rings was gone. The smaller one. I looked in the Port and saw the remains of it.
Pulled it out with tweezers.

 

[GlenM]

I noted recently, that I had not changed the coolant in my Majesty in quite some time. I decided to do that. However...
I now have another problem;
I unscrewed the wrong "Drain" screw on the engine. Not realizing it till too late. To make matters worse, I stupidly decided to push a little air with a compressor down the radiator cap tube, to squeeze out all the old coolant, since it had been a while since the last time I did it. Well...
Now my engine will not circulate new coolant, and runs 'hot.'
I could use some advice from you more mechanical folks out there on what the problem may be. I've checked for blockage in tubes as best as I could, and so far have found none. The pump looks good. So the only possibility that I can see left, is that maybe I've damaged the 'thermostat' with the backpressure?
Any suggestions or advice would be most appreciated!
Seeing as how the dealerships do not want to service what they sell after 10 years.

I too opened the wrong screw on top of the engine. Turned out to be to an oil passage..Engine pumped out almost all of the oil on the floor until I shut motor off.....Finally found the air bleed screw...had to get my head way down in the front of the seat box, while pulling up on the rubber flap. Made mistake of removing it once, had a dickens of a time screwing it back in, couldn't get the theads to catch. Just loosen it about 4 turns should be enough.