VonGustaf Posted September 4, 2016 Share #1 Posted September 4, 2016 Hi. I just bought a Royal Venture - 89 and have a problem with a coolant leak. it comes from a hole in front engine half from under the side panel that sits on engine half.. What is this hole and why can it leak as that?? Thanks in advance... /Kent Link to comment Share on other sites More sharing options...
Prairiehammer Posted September 4, 2016 Share #2 Posted September 4, 2016 It is a water jacket drain hole and should have a rubber plug in it. http://www.boats.net/parts/detail/yamaha/Y-90338-11152-00.html Link to comment Share on other sites More sharing options...
bongobobny Posted September 4, 2016 Share #3 Posted September 4, 2016 Yup! And probably a very good idea to clean/ream/drill out the hole before installing the new rubber plug if you don't want the new one to leak even worse. Just don't make the hole any bigger than what it already is, within reason, or the new plug will not fit properly... Link to comment Share on other sites More sharing options...
VonGustaf Posted September 4, 2016 Author Share #4 Posted September 4, 2016 Thanks for reply. Strange that i have ride at least 700km and not have any leak before as it have not been any plug in hole.... Link to comment Share on other sites More sharing options...
bongobobny Posted September 4, 2016 Share #5 Posted September 4, 2016 Might be a big "clot" of rust, sludge, and crud that is acting as a plug... Link to comment Share on other sites More sharing options...
cimmer Posted September 5, 2016 Share #6 Posted September 5, 2016 I would suggest check the other plugs to make sure they are there also just in case you need to order all 4. These are fairly easy to access. The easiest way I have found to pull them out is with the terminal end of a spark plug. Remove the cap to wear you just have the treaded end of the spark plug and it will screw into the plugs in the cylinder jacks and then give it a pull and out comes the plug. Just remember there is coolant behind the plug. Good luck. Rick F. Link to comment Share on other sites More sharing options...
Black wing Posted September 8, 2016 Share #7 Posted September 8, 2016 (edited) the hole the arrow is pointing to is the water drain for around the spark plug. it lets water escape so it doesn't pool around the plug. all the oils and dirt that fall in there get flushed out with the rain water. Edited September 8, 2016 by Black wing Link to comment Share on other sites More sharing options...
yamagrl Posted September 8, 2016 Share #8 Posted September 8, 2016 This the plug that everyone above is referring to. Those covers put force on those plugs to hold them in place. Do not run the engine with those covers off. The plugs will be blown out as the cooling system heats up and builds pressure. Link to comment Share on other sites More sharing options...
bongobobny Posted September 8, 2016 Share #9 Posted September 8, 2016 Yup!!!! I just ASS-U-ME'd that he took the cover off to show where the leak was coming from. Figured he saw weeping coming from the cover and investigated... Link to comment Share on other sites More sharing options...
yamagrl Posted September 8, 2016 Share #10 Posted September 8, 2016 Yup!!!! I just ASS-U-ME'd that he took the cover off to show where the leak was coming from. Figured he saw weeping coming from the cover and investigated... You're probly right but better safe than sorry. Link to comment Share on other sites More sharing options...
VonGustaf Posted September 9, 2016 Author Share #11 Posted September 9, 2016 Yes i saw it pouring down engine case and down on floor. Took cover of and started the engine. after ca 30-40 sec it started to pour out of hole and it is coolant fluid as it is green. if it is the sparkplug drain hole then i think i have a leak somewhere else.... :/ Link to comment Share on other sites More sharing options...
Black wing Posted September 9, 2016 Share #12 Posted September 9, 2016 if that is the rear right cylinder its coming from the hose at the top of the head and running down into the spark plug relief. Link to comment Share on other sites More sharing options...
yamagrl Posted September 9, 2016 Share #13 Posted September 9, 2016 if that is the rear right cylinder its coming from the hose at the top of the head and running down into the spark plug relief. Or the left front Link to comment Share on other sites More sharing options...
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