paul2289 Posted June 10, 2015 Share Posted June 10, 2015 During my preflight check i found some oil under the pump between the main casing and the plastic near the pull starter. I cleaned it of but it has come back after a 30 minute flight. I guess i need to take the motor off and strip the starter pulley and plastic cowling off. Has anyone had this and are there any tips / suggestions as to where it might be coming from? Here is a photo of it. https://www.flickr.com/gp/133040592@N08/736wX3 Quote Link to comment Share on other sites More sharing options...
paul2289 Posted June 13, 2015 Author Share Posted June 13, 2015 I have removed the plastic fan cover and snapped some pictures. https://www.flickr.com/gp/133040592@N08/N17c4w Quote Link to comment Share on other sites More sharing options...
Guest Posted June 13, 2015 Share Posted June 13, 2015 If that white goop is a 'gasket' I suspect you need to replace the goop. Before opening anything up, its worth checking all the casing bolts are torqued up correctly as they may have worked slightly loose over time. Best of luck and here's to a quick solve for you! SW Quote Link to comment Share on other sites More sharing options...
paul2289 Posted June 13, 2015 Author Share Posted June 13, 2015 Thanks, i have emailed Paul B as that goes a bit beyond what i am happy doing especially as there is a crank sensor on he fly wheel that i can imagine getting out of alingment when i refit it causing problems. Quote Link to comment Share on other sites More sharing options...
Guest Posted June 13, 2015 Share Posted June 13, 2015 Did you check to see if they were a little loose first? May save you both a load of time. Over time the case bolts (of any engine) can stretch just a tiny tiny bit but enough to cause a leak. SW Quote Link to comment Share on other sites More sharing options...
paul2289 Posted June 13, 2015 Author Share Posted June 13, 2015 I cannot get at them without removing the flywheel and i dont have a puller. I think i will take it to the guy that services my motorbike to look at it. Quote Link to comment Share on other sites More sharing options...
Guest Posted June 13, 2015 Share Posted June 13, 2015 Ahhhh, got you... bugger. Get well soon V5 the sun is here to play SW Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted June 15, 2015 Share Posted June 15, 2015 I've had a leak there for some time, nothing major just wipe it off once in a while. Incidentally, are you sure its oil?.. I have a problem with mine whereby when the carb rubber reaches around 6 hours I get carb frothing which apart from causing misfire on higher power settings, it also causes fuel to be vented out the overflow which causes what looks like oil spatter on the prop pylon. I can only imagine that petrol attracts dust and crap which accounts for the appearance. Nige Quote Link to comment Share on other sites More sharing options...
paul2289 Posted June 29, 2015 Author Share Posted June 29, 2015 I am 99% sure it is oil. It's probably just a weak part of the gasket. Given there is less than .5l of oil in it losing any is not good in my book I am hopefully getting it into bailey this week to be fixed. Quote Link to comment Share on other sites More sharing options...
rabcam Posted July 6, 2015 Share Posted July 6, 2015 Hi guys its a reply to Nigel_d. About your carb rubber lasting around 6 hours. My V5 was doing exactly what you described until I made up an extra brace for the carb with another rubber mount, no more carb frothing or miss firing at full power. I can send pics of what my motor looks like now. Quote Link to comment Share on other sites More sharing options...
alan_k Posted July 7, 2015 Share Posted July 7, 2015 I have a V5 so would be interested to see what you have done, Cheers, Alan Quote Link to comment Share on other sites More sharing options...
rabcam Posted July 8, 2015 Share Posted July 8, 2015 Here's a picture of my mod, seems to work very well... Quote Link to comment Share on other sites More sharing options...
alan_k Posted July 8, 2015 Share Posted July 8, 2015 Looks good, is this an extra bracket? i.e. is there an original similar bracket on the opposite side, bolted to a rubber mounted on the top of the reduction drive? Cheers, Alan Quote Link to comment Share on other sites More sharing options...
rabcam Posted July 8, 2015 Share Posted July 8, 2015 Yep, it still has the original mount on the drive mount.. And I fabricated the metal bracket and welded it to the steel side plate on the carb. I shortened the spacers on the engine mounts by the thickness of the aluminium angle so as not to alter the engine thrust angle. Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted July 8, 2015 Share Posted July 8, 2015 Hey that's a great looking mod. As it happens I have just posted on the Yahoo groups forum and gave details of an alternative mod. Its early days but I have over 8 hours on the current rubber with no running problems despite the rubber having loads of cracks. What I have done is to make a tube about 8mm wide and about 15mm long with one end closed. It is made by rolling a fine stainless gauze around the shank of a drill bit. Closing an end off keeps it from unrolling or a wrap of wire should do it, now what you do with it is to whip the float chamber off and slide it over the main jet housing, it should be a snug fit over the ally casting. The idea is that it stabilizes the fuel in the vicinity of the jet while the rest of the fuel is agitated by vibration thereby stopping air bubbles going up the jet. Nige Quote Link to comment Share on other sites More sharing options...
paul2289 Posted July 8, 2015 Author Share Posted July 8, 2015 I have picked my engine up from Bailey. It was an oil leak from the seal around the crank housing. I cannot wait to get flying again! Quote Link to comment Share on other sites More sharing options...
rabcam Posted July 9, 2015 Share Posted July 9, 2015 Mmmmm....... I'd be concerned about doing your mod Nige, with all those vibrations and a relatively soft die cast carb bowl with a steel gauze rubbing on it... It'll erode it away eventually. Maybe a piece of silicone rubber tube as a dampner would be better than the steel gauzein your mod....? Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted July 10, 2015 Share Posted July 10, 2015 It's quite solid how it sits however I'll keep an eye on it thanks.. got an extra couple of hours last night so am up to 10 with no misfire, however your mod is where I'll probably end up, how many hours does it have and how did you know about the frothing issue? It's been a problem from new in my case although they lasted around 12 hours in the first couple of years. Cheers Nige Quote Link to comment Share on other sites More sharing options...
rabcam Posted July 10, 2015 Share Posted July 10, 2015 I've done 27 hours since I fitted the extra mount with no problems at all.. Long may that continue. I spoke to both Bruce and John at Bailey about my misfire problem,which I was getting around every 6-7 hours after fitting new rubbers, and they said it was due to the carb rubbers softening up and allowing air leaks. They suggested another carb mount may help but couldn't advise how or where to fit it. So I looked at my motor and came up with what you see in the pic.. I've actually fitted an old carb rubber that used to cause a misfire before I fitted the extra mount and it still runs great with the old rubber..! I still have 3 old rubbers in my spares drawer.. Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted July 30, 2015 Share Posted July 30, 2015 Yeah, I've got lots of spare used rubbers to recycle! I checked the gauze today and it's still tight in its place after several hours of use and still runs good. Took some pics, I'll try to upload them. Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted July 30, 2015 Share Posted July 30, 2015 Gauze pic Quote Link to comment Share on other sites More sharing options...
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