1976 1000ltd


Information and questions on GL1000 Goldwings (1975-1979)
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ausie
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1976 1000ltd

Post by ausie »



I have oil leaking from a hole in the engine housing under the water pump . The hole is part of the housing but I have no idea what it's purpose is and why it is leaking oil. Can anyone give me some advice please?


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Rambozo
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Re: 1976 1000ltd

Post by Rambozo »

It indicates that your seal has gone bad. To make sure the coolant doesn't mix with the oil, there are two water pump seals, one for coolant and one for oil, with a weep hole between them, so when a seal goes bad, it leaks to the outside instead of inside.
ausie
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Re: 1976 1000ltd

Post by ausie »

Many thanks. I will take the cover off and replace seal
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dingdong
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Re: 1976 1000ltd

Post by dingdong »

There is more involved than just replacing that seal.
viewtopic.php?f=11&t=275
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Rambozo
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Re: 1976 1000ltd

Post by Rambozo »

Cyclemax offers a kit with all the gaskets and seals needed.
https://www.cyclemax.com/inc/sdetail/gl ... 809/158216
You might want to change the water pump while you are in there.
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Re: 1976 1000ltd

Post by WingAdmin »

It's the seal IN the water pump. Changing the seal on the gasket won't fix it, you have to change the water pump. As the other user mentioned, read up here: viewtopic.php?f=11&t=275
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Re: 1976 1000ltd

Post by Rambozo »

I thought the oil seal between the two pumps is in the front of the oil pump?
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Re: 1976 1000ltd

Post by WingAdmin »

Rambozo wrote: Thu May 13, 2021 6:44 pm I thought the oil seal between the two pumps is in the front of the oil pump?
The water pump is driven by the engine, by a shaft that comes through the front (pressure) oil pump. That (back) side of the water pump has oil flowing around. The front side of the water pump is subjected to coolant.

There are two seals inside the water pump. One seals the oil out (on the back side) and one seals the coolant out (on the front side).

If either seal fails, there is an escape channel that allows the fluid (oil or coolant) to escape, through the "weep hole" which is where the oil is leaking out in this case. This is intentional. Honda calls it a "tell-tale" hole because if there's fluid coming out of it, it is telling you that the seal in your water pump has failed.

Some people have seen oil (or coolant!) leaking out of this hole, thought "a leak!" and sealed it up with epoxy, and once I saw a wood screw shoved in there! Doing this means the fluid migrates through the pump and is forced out the other seal, resulting in oil in your coolant, or coolant in your oil, neither of which is a good thing.

Blue is coolant, green is oil
Blue is coolant, green is oil

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Rambozo
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Re: 1976 1000ltd

Post by Rambozo »

The thing is there should not even be any oil behind the bearings if the shaft seal in the oil pump housing and the case o-rings are doing their job. The bearings live in a sealed compartment, not common to the oil bath. Depending on the sealed bearing seals to keep oil out is not their designed function. The only way oil can migrate to the start of your green path is for the shaft seal in the oil pump housing, or the o-ring that makes the face seal to fail.

I did say to change everything since it is such an ordeal to get to this area, but I just wanted to be clear about what was failing to cause an oil leak.

Let's see if this works.

It did! The two red dots are the sealed points connected by the pump housings. O-ring to the left, shaft seal to the right. One of those would have to fail to allow oil into the bearings. And of course then it would follow your green path to the weep hole. As well as failure of the o-rings on the water pump body which would connect the oil bath to the weep hole if they failed. (the other green path)


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Re: 1976 1000ltd

Post by Old Fogey »



'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

( Seriously, you haven't read all 115 pages of my http://www.wingovations.com website ?? :shock: )
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