coolant leak 2 questions


Information and questions on GL1500 Goldwings (1988-2000)
Post Reply
Crusty1
Posts: 127
Joined: Sat Jun 06, 2020 10:57 am
Location: Kansas
Motorcycle: 2000 GL1500SE
2007 ST1300A ABS

coolant leak 2 questions

Post by Crusty1 »



Chasing a coolant leak on my 2000 GL1500SE 55,000miles. Coolant pooling on top of cylinder block left front. Likely from the large coolant pipe connecting the head to the thermostat housing.

Question number one. The old o-rings were flat due to age. New ones appear to have a stepped sealing surface and appear to be directional. See picture. I did not find the answer in my repair manual. Is this the correct direction for installation?

Question number two. Are there any other common or likely sources for a leak in this area?


Thanks in advance


User avatar
newday777
Posts: 2422
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH
Motorcycle: 2008 Cabernet Red. Level 4 bought at 15,000 now 172,000

1975 CB750 K5 Planet Blue 11,00 miles

Project bikes
1976 CB750 K6 Anteres Red 25,000 miles, 2 more K6s, 1 K4, 1 K8

Past rides
1983 GL1100A Wineberry 63,000 miles(sold)

1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: coolant leak 2 questions

Post by newday777 »

1. I've not seen the new stepped o-rings. Are they from Honda? I would think that is the correct install direction.
2. Have you checked the coolant lines into and out of the carbs?
How about the coolant reservoir tube and right angle elbow?
There is also a short connector hose between the 2 radiators to check.
User avatar
Snowmoer
Posts: 315
Joined: Fri Jan 25, 2013 12:23 pm
Location: Cedar City UT
Motorcycle: 2012 GL 1800
1977 GL 1000
2012 KLR 650

Re: coolant leak 2 questions

Post by Snowmoer »

The leak I had in the same place was from the O rings that you are replacing. I have not seen that type of O ring either. I would install it like you are doing. It is a Honda one? If not, remember, everything is metric on these bikes. A standard O ring is a different size and will not seal up right.
Crusty1
Posts: 127
Joined: Sat Jun 06, 2020 10:57 am
Location: Kansas
Motorcycle: 2000 GL1500SE
2007 ST1300A ABS

Re: coolant leak 2 questions

Post by Crusty1 »

Thanks for the replies.

The orings I am installing are OEM Honda. The old ones appear to have been stepped at the beginning of their life. I have ordered every small coolant hose excluding the main radiator hoses. This is a nasty job. The worst I have encountered on any bike. Lots of tupperware removed, Carbs and intake manifolds also. With 22 years of age I am trying to avoid having to go back in for a repeat performance.


Post Reply