Removing thermostat cover bolts GL1500


Information and questions on GL1500 Goldwings (1988-2000)
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Aussie81Interstate
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Removing thermostat cover bolts GL1500

Postby Aussie81Interstate » Thu Dec 17, 2015 8:29 pm



I have managed to remove the lower fairings, radiator shroud, both radiators, and now looking to remove the thermostat cover.

Also have moved the fans out of the way as far as I can - but not fully removed them from the bike (PITA).

Does anyone know how to easily get to the rear bolt holding the thermostat cover on? I cannot even see where to get to this bolt at all?

Apart from all the coil wires in the way - is it easier to remove the whole thermostat housing?

thanks guys - it is also nearly 90 degrees out side in the sun at the moment - so that's why I am in here having a break.. ;) too much perspiration.



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bstig60
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Re: Removing thermostat cover bolts GL1500

Postby bstig60 » Thu Dec 17, 2015 11:04 pm

Oh, for some 90*F weather!!! Its just about freezing here. If you don't have a service manual, I would advise getting the Clymer's Service Manual. The Factory manual for your year is preferable, albeit expensive.
There should be 3 bolts holding the thermostat cover. You will need to remove the radiators, fans and the upper hose from the thermostat cover to get to the bolts.
Bill

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Aussie81Interstate
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Re: Removing thermostat cover bolts GL1500

Postby Aussie81Interstate » Fri Dec 18, 2015 3:06 am

So I suppose the answer is to remove the radiator hose going into the thermostat cover, then I get access to the rear bolt - or be able to see it (bloody obvious when someone else provides the clue).. :D

Thanks for that - will tackle that job early tomorrow morning - so should be able to pick up a new thermostat and the radiators tomorrow morning as well..

then to reassemble :)

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Aussie81Interstate
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Re: Removing thermostat cover bolts GL1500

Postby Aussie81Interstate » Fri Dec 18, 2015 5:29 am

Will try this again for the third time
Might post this anyway so at least I can edit it later.

OK - that works.

My eldest son assisted to get the top hose off the thermostat and remove the top - did not snap any bolts - but they were tight and corroded - so relieved they came undone OK, will buy some anti seize tomorrow and a new thermostat.

Thermostat had some green granulated muck on top - not much - more like a few small lumps of sugar - maybe a 20th of a teaspoon. Thermostat was not stuck open ( might be stuck closed).

When thermostat removed there was some sludge underneath and evidence of corrosion - some pictures to follow:

I think I will be cleaning and flushing for a few hours tomorrow. Thermostat seal is fine - so will clean it up and reuse it.
Attachments
Best picture I could get
Best picture I could get
Obvious corrosion that needs to be cleaned
Obvious corrosion that needs to be cleaned
A bit of clean up to do
A bit of clean up to do
Sludge from under thermostat
Sludge from under thermostat

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RBGERSON
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Re: Removing thermostat cover bolts GL1500

Postby RBGERSON » Fri Dec 18, 2015 8:57 am

easy to test it..pot of water, candy thermometer, stove top. note temp when she starts to open and then cool water and note when she closes.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

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MikeB
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Re: Removing thermostat cover bolts GL1500

Postby MikeB » Fri Dec 18, 2015 6:11 pm

Aussie81Interstate wrote:Thermostat seal is fine - so will clean it up and reuse it.

Replacing the seal now may save you the headache of tearing it apart again. If that seal is as old as the motorcycle, it may be a good idea to replace it.
MikeB
Tacoma, WA, USA

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Aussie81Interstate
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Re: Removing thermostat cover bolts GL1500

Postby Aussie81Interstate » Fri Dec 18, 2015 6:52 pm

Pretty sure someone has been in there before me, as there was some sealant around the O ring top and bottom.

Purchased another thermostat - exactly the same size in diameter - a little bit shorter in the top and bottom dimensions - length wise - so plenty of room in the housing for it - cost a total of AU$15.25.

Honda wanted AU$77.45 and AU$7.90 for the seal.
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52mm diameter
52mm diameter
42mm depth & 38mm depth
42mm depth & 38mm depth

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dingdong
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Re: Removing thermostat cover bolts GL1500

Postby dingdong » Sat Dec 19, 2015 9:36 am

When replacing with something other than OEM make sure it has the correct temp ratings.

Starts to open: 80 / 84° C (116 / 183° F)
Full open: 93 / 91° C (199 / 200° F)
Valve lift: 8 mm (0.31 in) minimum
Tom

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Aussie81Interstate
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Re: Removing thermostat cover bolts GL1500

Postby Aussie81Interstate » Sat Dec 19, 2015 8:21 pm

Temperature rating was the same 82 celsius.

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ct1500
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Re: Removing thermostat cover bolts GL1500

Postby ct1500 » Sun Dec 20, 2015 7:53 am

A thermostat is an integral part of a well designed cooling system and are application unique evidenced by literally hundreds of different designs. The thermostat when opened acts like a restriction regulating the speed of coolant through the engine and radiators which has a direct correlation of the ability of radiators to properly transfer heat.

Changing thermostats to one that just physically fits and reusing old seals is never advised. Your replacement thermostat opening dimension is much smaller than the OEM on the left and will likely cause problems down the road in reduced coolant flow through the system from Engineer designed specs.

The OEM stat also has the air bleed which I do not see on your replacement making refill problematic for getting air bound.
This is what I do
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Aussie81Interstate
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Re: Removing thermostat cover bolts GL1500

Postby Aussie81Interstate » Sun Dec 20, 2015 4:17 pm

Thanks for your comments, I am not an engineer - and take note of your statements re- flow etc.

The existing thermostat removed had no air bleed in it either. Regarding the volume of coolant being pushed through the opening- looking at the size of the radiators I would think this impact would be negligible - but I bow to your knowledge, and will see what happens in the future. The old seal was in perfect shape - and after removing some old sealant I was quite happy to re-use it - otherwise if it was degraded I would have purchased a new one.

Cheers :)




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