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Old 07-11-2006, 09:36 PM   #1
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Default RB S7 Engine Leak!!!!!!

Hey guys, I have an RB S7 Engine that runs great, but lately I've noticed alot of dirt and oil buildup around the front on the Engine and the case. I figured the front seal was going, but after I got done running it today, I noticed the build up of dirt is substantially more.

It's surrounding the whole case and around the base of the motor mount you can see where there is a layer of dirt and oil, covered with more dirt and oil. It almost looks like a lava flow, but it's just layered up dirt and oil that keeps building up.

Is this just leaky bearings or an indication that something horrible is about to happen?

I recieved this engine used, but was told it had a new piston and sleeve that has been ported and polished. I've been greatly impressed with it since I have almost 6 gallons through it this summer alone. Compression is good and it runs continuously from full to empty.

My major problem is that our region 8 race is comming up at the end of the month, and it looks as if the engine won't make it till then, let alone a 45 minute main! is it worth replacing the picton and sleeve as well as the main bearings, or should I just pop for the new engine?
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Old 07-12-2006, 03:46 AM   #2
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pull the flywheel off and check if the leak is coming from the front bearing. is the rest of the engine sealed with sensore-safe silicone (fuel won't break this type of silicone down)? if not, it could be coming from the base of the carb if the pinch bolt has ever been over-tightened. if anything, try sealing up the engine and clean the outside of it really well. run a tank and then check to see where the majority of the dirt is collecting. if it is from the front bearing, just replace it and run it to see if it still leaks. front bearings aren't to expensive either...
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Old 07-12-2006, 05:06 AM   #3
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or the carburators O ring is busted, I too had that problem once efore caused by a malfunctioned front bearing. A replacement did the trick,hope that helps
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Old 07-12-2006, 07:02 AM   #4
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For the amount of fuel and dirt he is talking about I doubt it is a carb leak.

xlgraphicspro sounds like it's you front bearing. If the engine is still running good replace the bearing and all will be good.

Look here!

http://www.avidrc.com/?action=item&i...1&prevstart=50
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Old 07-12-2006, 07:43 AM   #5
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Do yourself a favor...

Get all new O rings for the carb....
http://www.amainhobbies.com/product_...oducts_id/4760
http://www.amainhobbies.com/product_...oducts_id/4758
http://www.amainhobbies.com/product_...oducts_id/4757
And get this if the dirt is from the front bearing.
http://www.amainhobbies.com/product_...oducts_id/2321
And use this to seal the rear plate and around the base of the carb but use it sparingly.
http://www.amainhobbies.com/product_...oducts_id/2356

That should end the leaking.
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Old 07-12-2006, 08:57 AM   #6
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Mr. Shookie do you not like the Avid bearings or just giving another choice?
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Old 07-12-2006, 12:59 PM   #7
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I just had Both bearings replaced on my engine that experienced this same "lava-flow" looking buildup....the bearings got so bad so quickly that you could hear this ungodly sound across the track! It sounded like quarters rattling on an Olds 455 engine block....if you could imagine that....you can also inhale dirt through the blown fron tbearing, so be careful.
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Old 07-12-2006, 01:49 PM   #8
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i had a rb motor do the same thing! if it has the blue seal front bearing change it! they are poo and leak alot. my motor had half a gallon on it when this happened. i ordered a 5$ bearing from avid and it hasn't leaked since
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Old 07-12-2006, 06:15 PM   #9
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Sweet, you guys are a great help! I appreciate all the time you guys took and for all the links. I'm a great supporter of AVID bEARINGS. I think I'll order that, while I'm at it should I replace the rear bearing too?

Also, what is the best way to go about replacing these bearings?
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Old 07-12-2006, 07:29 PM   #10
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the way i did mine was i took the motor down to just the case with the bearings in it. poped it in the oven with it at 350 for a few mins. pulled it out (wearing oven gloves) and poped the bearing out with a wooden dow. then i put the crank case in the oven again for another coulpe mins and pressed the new bearing in with a nother wooden dow.
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Old 07-12-2006, 09:16 PM   #11
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Micro's got it down.
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Old 07-14-2006, 12:56 AM   #12
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Ok, I took it appart and saw that the front bearing seal had cracked away to the pont that I could see the balls.

I managed to pop the bearing out, alot easier than I expected using the oven, and I replaced it with a new one. I also cleaned out the engine using just my odonnell fuel. Should I work some after run oil into it before I start it up again?
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Old 07-14-2006, 07:34 AM   #13
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Anytime I have an engine tore down like you just did with the bearing deal I will clean and lube everything while putting it back together. Anytime you put dry parts back into an engine and close it up you have a chance for rust if it sits for a while.
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Old 07-14-2006, 04:18 PM   #14
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what do you lube it up with?
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Old 07-15-2006, 04:24 AM   #15
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juat about any type of light bearing oil will work well for an assembly lube.
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