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 Rank: Beginner Level 1 Groups: Registered
Joined: 03/11/2014 Posts: 9 Points: 27 Location: Brisbane
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Hello all, Today I decided to give my RB7 a test and a low speed run in after setting up my throttle and brake linkages. After a good run I noticed a large amount of used fuel built up underneath the body at the back of the engine. I assumed my exhaust pipe was not connected correctly but what I found was the oil was leaking from around the hexagonal O-ring gasket on the side plate for the fuel pressure line. This side plate seems to bottom out prior to the gasket pulling up and sealing correctly. Has anyone else seen this issue, or could this be happening because I am using 16% fuel for running in the engine. There is a lot of oil it forms a puddle underneath the car after leaving it standing I have to put rugs underneath. Thanks Carl 
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 Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Exhaust oil residue is common to the majority of nitro models and is because of the oil content in the fuel rather than the % of nitro.
Possibly the residue is coming from is the joint of the rubber exhaust pipe onto the silencer. A cable tie around the joint may help.
You could also consider opening the manifold joint where it joins with the silencer box., apply a light coat of clear silicone sealant around the joint then reassemble. But be careful not to apply too much that it then retricts the exhaust flow when the parts are reassembled.
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Rank: Beginner Level 1 Groups: Registered
Joined: 03/11/2014 Posts: 9 Points: 27 Location: Brisbane
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Thanks for the info on the oil, at least I know it is not too much. It is definitely not the exhaust it is tight and well sealed. It is coming from the side plate on the muffler that the fuel line connects too which is held on by the two screws. I will apply some sealant there as the gasket is not up to the job.
Thanks
Carl
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Ensure that the surfaces are fully degreased before applying, with such as isopropyl alcohol, otherwise it won't adhere/seal.
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 Rank: Vice-Master    Groups: Registered
Joined: 05/04/2013 Posts: 540 Points: 1,630 Location: England
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Make sure you give your car a shake outside before bringing it in to get rid of most of the residue. I forgot to do it with my hummer the other day and I got some oil on the carpet. I wrap an old towel around my car to catch any additional oil. The same will happen when you put after run oil through it. Finished 3D Printer, RB7, Hummer, Skyrider drone & Combat tank collection http://www.model-space.com/gb/
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Rank: Beginner Level 1 Groups: Registered
Joined: 03/11/2014 Posts: 9 Points: 27 Location: Brisbane
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Thanks for the great advice, guys.
Tomick, definitely will and I will leave it air and dry thanks.
Kenjara, that's a good idea although I am not new to model building this is my first Nitro so that is advice I will certainly take.
Carl
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