burning oil after overhaul - Yamaha Rhino Forum - Rhino Forums.net
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post #1 of 10 (permalink) Old 09-16-2010, 09:44 AM Thread Starter
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Wrench burning oil after overhaul

I just had my Rhino 660 motor overhauled and it is burning a fair amount of oil. 250-300ml every 50kms.
The cases were busted due to middle gear support failure.
Got new cases , weller middle gear support, new tranny gears all internal bearing new. New valve stem seals, and reseated valves. Honed cylinder and new rings.
The motor runs well with good power etc. The guy that rebuilt it said to run two tanks of fuel through it and then change oil so I'm assuming that this is the break in period. Exhaust is blue when I hammer on it and when I let off and coast. I realize the rings need to seat but I'm getting impatient with having put 135kms on it and still burning oil. Using regular 10-50 ATV oil.
Could be valve guides or rings?
What are your thoughts?
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post #2 of 10 (permalink) Old 09-16-2010, 10:57 AM
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Sounds like the rings are not seating
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post #3 of 10 (permalink) Old 09-16-2010, 10:59 AM
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post #4 of 10 (permalink) Old 09-16-2010, 01:22 PM
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the rhino calls for 10-40 oil.



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post #5 of 10 (permalink) Old 09-16-2010, 01:36 PM
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I don't think its the oil Rog, 10w40 and 10w50 are the same cold- the 10w50 is going to be thicker when hot (210 degrees f ) though.
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post #6 of 10 (permalink) Old 09-17-2010, 09:02 AM
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Dirtysidedown has a good answer, the rings are not seating. But since it is a rebuild, I'd also question if the rings were put in right (gapped correctly, gap in proper place).

Another thing, with the problem of the blue smoke on "coast" and the fact that new guides were put in, does it puff blue on startup?

Usually blue smoke on decel is vaccuum sucking oil through the guides (intake). You had a good amount of mileage on the motor before the rebuild, the valves may not have been deburred and scratched the new guides on the way in.

Also, does it burn less oil when the engine is cold?
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post #7 of 10 (permalink) Old 09-17-2010, 04:52 PM Thread Starter
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Kronik buddy!
The unit does not smoke on startup. It did at first but not anymore. There were only 3000km on it before the mid gear supp. broke. I'm going to run it for another 70km and see if it stops. If not, I'll be questioning the re builder!
Ev
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post #8 of 10 (permalink) Old 09-17-2010, 10:01 PM
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Dewd, you spent a lot of money getting that thing fixed, I really hope the guy stands behind it if the problem doesn't go away.
Maybe try a compression and leakdown test after your next 70kms then, see where that's at. The rings should have seated during the long weekend for sure.

As a side question, where are you planning the next 70kms? I might need to take my rhino out for one last rip before I tear the engine apart again
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post #9 of 10 (permalink) Old 09-27-2010, 06:01 PM Thread Starter
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Well Kronik, you were right.
After putting on another 40 km on the weekend (180km after overhaul)with not much change in oil consumption, I gave the guy a call and he said they should have seated a lot sooner. He said no problem to bring it in and he'll re-ring it. He said it sounded like a bum oil ring or stuck.
At least he can do it from the top end. Only problem is another trip up to Edmonton and removal of my camo cover and secondary cage in order to pull up the box.
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post #10 of 10 (permalink) Old 03-01-2011, 09:15 AM Thread Starter
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Burning oil after overhaul fixed!

Sorry to resurrect an old thread but I'd like to update my motor.
I took it in to get the motor checked over after the oil burning didn't stop.
Turns out that they didn't hone the cylinder deep enough and the rings did not seat. They honed the cylinder again, new rings and everything was good to go. It smoked only on initial start up and then disappeared within a minute. It is now running well since then.
You guys were right, it shouldn't smoke for any length of time after a re-ring.
Thanks Dirtysidedown, Kronik for all the input.
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