Water pump cover - O ring

Information and questions on GL1200 Goldwings (1984-1987)
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Posts: 4
Joined: Sun Sep 15, 2019 5:11 am
Location: New Jersey
Motorcycle: 1986 GL1200A Aspencade

Water pump cover - O ring

Post by borntolandhard » Thu Jan 02, 2020 9:02 pm

I removed my radiator a few days ago and after reassembly, there's a slight leak from the water pump cover (I followed this video). I reused the old o-ring. And it also looked like the previous owner used some gasketing on the mating surface.

I bought a new o-ring from Honda today and am going to replace it this weekend. My question is: put it on dry? lube with silicone? something else? Any other suggestions to make this leak-free? Thanks

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Motorcycle: 1985 Goldwing Aspencade (GL1200A

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1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
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1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: Water pump cover - O ring

Post by froche » Thu Jan 02, 2020 11:01 pm

Well I just replace my o rings at the water pump after adding an extension piece to allow the radiator to be moved out for a pooe boy.

Firstly I needed 2 orings, because I added the extension piece, normally you only need one. I didn't but the Honda O ring I bought 12 o rings from Global O rings. You can find them at globaloring.com. What I purchased was listed below

N2.00X046 2X46 METRIC O-RING 12 EA
N2.00X054 2X54 METRIC O-RING 10 EA

They were really inexpensive, the 2x46 were 15 cents each (that's the size needed for water pump) the 2x54 are for the upper thermostat housing (I needed those because while there I had to remove that outlet to get the radiator off) and the small size is for the orings used on the exhaust air input (I removed mine) with shipping it came to 9.73 total!

one Honda Oring will cost about 5.00 plus 5.00 to ship!

On to the leak part.
On a brand new Honda orings work fine, on older Honda's they work fine but every surface needs to be clean and free of junk (old gasket cement, silicone, oil residue, etc and no scratches (surface scratches are ok).

I stuffed a plastic bag into the water pump without the outlet cover on it and used a putty knife (never use a knife to clean with) to clean it, followed by a rag wet with brake cleaner. Then I used a drill with a 3-m scrunge pad to clean the outlet cover and the used a small sculpting tool to clean off all the gasket material from the outlet (I had temporarily used a Moroso part from a big block Chevy as a spacer and o rings wouldn't seal it so I had to use gaskets and gasket stuff to seal) followed by brake cleaner to finish.

It sealed fine, probably just really cleaning all the old stuff off and really cleaning everything will let the new o ring seal fine. Reusing orings can sometimes works but after they are held in compression thay can take a 'set" and will not completely seal. Certainly if it is in an inaccessible spot I suggest using new ones.

As to using anything to seal them... don't use anything. I always use a tiny bit of grease around the o ring in 2 to 3 spots and that hold them in just fine, and will melt and 'dissapear".

Good luck

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Re: Water pump cover - O ring

Post by winguyjo » Fri Jan 03, 2020 2:39 am

dry or with a thin film of silicone, your choice. as stated, it's crucial to have clean, smooth mating surfaces.

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Re: Water pump cover - O ring

Post by WingAdmin » Fri Jan 03, 2020 4:30 pm

Don't do it dry. It's critical that the O-ring not roll when the pump is inserted into its cavity, or it will leak.

Silicone can work. Don't use petroleum jelly or oil, as they can attack the O-ring. The best thing to use is actually KY-jelly or other glycerin/water-based "personal lubricant." It's very slippery, won't hurt the O-ring, and dissolves/evaporates in the coolant.

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Re: Water pump cover - O ring

Post by borntolandhard » Sat Jan 11, 2020 9:07 am

For future reference for anyone who needs it...
I sanded both surfaces with 180 grit paper to remove all the old stuff on there, cleaned the channel with brake cleaner and a pick, used a brand new O-ring covered with a thin film of silicone grease, and it is now leak-free. Thanks.
The service manual doesn't give torque specs for water cover bolts so I put on about 25Nm

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