Transmission Fluid Leak - 1800 ??

Information and questions on GL1800 Goldwings (2001-Present)
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Transmission Fluid Leak - 1800 ??

Postby gold1803 » Mon Nov 02, 2009 1:03 pm

I have a '05 GL1800 trike that leaks a green fluid under the engine when I have either the front wheel only up on a block (apx 5") or when the rear end (wheels) only are up on blocks. It is not a constant run, just a small 2" circumference spot on the floor. When the trike is level on the ground there is no leak. What could be cause?

Thanks any/all advice

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Re: Transmission Fluid Leak - 1800 ??

Postby WingAdmin » Mon Nov 02, 2009 3:45 pm

Well, a couple of things:

First: there is no transmission fluid. The transmission, like most integrated motorcycles (where the transmission is built into the engine case), uses engine oil for lubrication.

Second, what you're seeing is coolant. You can confirm this by taking a tiny bit of it on your finger, and touching it to your tongue. If it is coolant, it will taste sweet (when I say tiny, I mean TINY - it is poisonous).

If you can put a cup under the bike and capture some of it, you can try adding cooking oil to it. If it mixes, it's oil. If it doesn't mix, it's coolant.

I don't know how the water pump works in an 1800, but in an 1100, seeing drops of coolant on the ground indicates a failing O-ring or water pump bearing.

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Re: Transmission Fluid Leak - 1800 ??

Postby gareva1 » Tue Nov 03, 2009 10:21 am

On an 1800, the most common cause for this type of leak is loose hose clamps on the cooling system....while I was looking for a photo of the hose clamps, I found you also posted on the gl1800riders looks like they are going to get you on the right track...the cooling system hose routing is the same across the whole 1800 series, so you should be able to pull the service manual off this site and go hunting if you catch the urge...depending on how many miles you put on it, I may be inclined to just watch the coolant level and refill as necessary...another possibility is that the coolant is coming from a coolant overflow tank under the bike towards the back...if theres a crack in it, it could leak some if there is any coolant in it.

The thread you started at the other forum is here, and maybe someone else could get some use out of it: ... ose+clamps

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Re: Transmission Fluid Leak - 1800 ??

Postby gold1803 » Tue Nov 03, 2009 10:50 am

Many thanks for the feedback.

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