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<blockquote data-quote="Placerville" data-source="post: 78360" data-attributes="member: 2418">Two of the three things that can leak on a pump have been mentioned.&nbsp; The third is the crush washers under the bolts that hold the pump in place.&nbsp; So, you have a dilemma on your hands, don&#039;t you?&nbsp; If there&#039;s no &#039;side to side&#039; play in that pump shaft, that means the large O ring and crush washers are more suspect.&nbsp; But, as stated above, the shaft could be leaking even though it currently has no play.&nbsp; (I&#039;m not being much help, am I?)&nbsp; Here&#039;s something that might make you feel better.....&nbsp; Is the impeller on your pump Bakelite?&nbsp; If so, it&#039;s the original factory pump and (bad or not) it needs to be changed because they all tend to fail about this time anyway.&nbsp; So, don&#039;t worry about it.&nbsp; Replace your pump, gaskets and all of those O rings.&nbsp; While your at it, take your radiator to a shop and have them clean it, re-solder the outlets and pressure test it.&nbsp; You&#039;ll be glad you did.&nbsp; Replace your thermostat as well.&nbsp; If you haven&#039;t picked up a complete pump gasket set as yet, <a href="https://www.ebay.com/itm/GL1000-GL1100-GL1100I-GL1100A-GL1000L-LTD-WATER-PUMP-SEAL-GASKET-SET-/190824619441?pt=Motorcycles_Parts_Accessories&amp;vxp=mtr&amp;hash=item2c6e089db1" target="_blank">this</a> is a good one.&nbsp; It has everything you need for your &#039;77 (there will be one or two O rings left over on a 1000) and it has a proven track record.&nbsp; Tip:&nbsp; Don&#039;t forget the tiny O ring that goes over the post in the upper right corner.&nbsp; Miss that one and you&#039;ll have oil in your coolant.</blockquote>

[QUOTE="Placerville, post: 78360, member: 2418"] Two of the three things that can leak on a pump have been mentioned. The third is the crush washers under the bolts that hold the pump in place. So, you have a dilemma on your hands, don't you? If there's no 'side to side' play in that pump shaft, that means the large O ring and crush washers are more suspect. But, as stated above, the shaft could be leaking even though it currently has no play. (I'm not being much help, am I?) Here's something that might make you feel better..... Is the impeller on your pump Bakelite? If so, it's the original factory pump and (bad or not) it needs to be changed because they all tend to fail about this time anyway. So, don't worry about it. Replace your pump, gaskets and all of those O rings. While your at it, take your radiator to a shop and have them clean it, re-solder the outlets and pressure test it. You'll be glad you did. Replace your thermostat as well. If you haven't picked up a complete pump gasket set as yet, [url=https://www.ebay.com/itm/GL1000-GL1100-GL1100I-GL1100A-GL1000L-LTD-WATER-PUMP-SEAL-GASKET-SET-/190824619441?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item2c6e089db1]this[/url] is a good one. It has everything you need for your '77 (there will be one or two O rings left over on a 1000) and it has a proven track record. Tip: Don't forget the tiny O ring that goes over the post in the upper right corner. Miss that one and you'll have oil in your coolant. [/QUOTE]

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