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.: XT660.com - The #1 XT660 Resource :. ( https://www.xt660.com/index.php)

- Service & Maintenance ( https://www.xt660.com/forumdisplay.php?f=208)

- - Overfilling engine oil ( https://www.xt660.com/showthread.php?t=14592)

nazurro

03-08-10 23:14

Overfilling engine oil

Today I changed oil and oil filter, and unfortunately I have put in to much oil. Is it bad for the engine, or could it perhaps just push it out via the crankcase ventilation? Or should I try to suck some oil back from the oil filler hole?

I have put in 2.6L but have put in about 2.9L.

JMo	03-08-10 23:17

Personally I'd just crack the drain nut on the frame down tube (or the crank case if you prefer), and empty approximately 300ml out into a jug...

Replace drain plug, warm up engine, check level, and top up if needs be...

J x

nazurro

03-08-10 23:19

Quote:

Originally Posted by JMo (Post 134896)

Thanks, yes maybe easier than trying to suck it out.

Still a bit curious though how an engine is affected by to much oil.

JMo	03-08-10 23:27

Quote:

Originally Posted by nazurro (Post 134897)

Still a bit curious though how an engine is affected by to much oil.

It is possible that [particularly at high speed/revs], the crankcase will pressurize and the oil blow out... if you're lucky, only though the crankcase breather [and into the airbox] as you surmise, but if you're unlucky, past the countershaft output seal, pi55ing oil all over the place...

I'm sure some engine nerd will also elaborate - but I believe it's possible oil could be forced past the valve stem seals too for example?

Anyway, best not to have too much extra oil in there... a 100-200ml might not make much difference [especially on a sump with 2.6litres in], but 300ml might be pushing it a bit?

Of course the XT does keep some of the oil in the frame, so I guess there is a bit more 'breathing space' than on a wet-sump engine, but the principle is the same...

J x

nazurro

03-08-10 23:36

Quote:

Originally Posted by JMo (Post 134899)

Thanks for the info! I would be stupid to push my luck right :)
I'll just drain it a little and get it right instead.

stumpydave

03-08-10 23:44

Very well put jmo, you are correct in saying too much excess oil will blow seals but as you say a relatively small amount will cause no harm.

I was once at a friends garage some years ago and a customer towed their car in complaining that it wouldnt start, on investigation it emerged he had changed the oil and filter himself and when he had put fresh oil in he had FILLED it right to the TOP (all 3 gallons of it!). Not supriseingly it wouldnt even turn over!! :bricks:

Kev	04-08-10 02:07

I would drain the excess oil to the correct oil level.

Not only can it cause oil leaks, the extra oil can damage the exhaust cat with contamination if it is blown through the engine breather hose into the air box.

nazurro

04-08-10 09:23

Quote:

Originally Posted by Kev (Post 134909)

Thanks Kev, I will do that today. Yesterday was a disaster. I have changed oil and filter many times on other bikes but this one got me bad, everything that could go wrong did... I probably should have had something more to eat :bricks:

theclowncrusty

14-08-10 07:40

Hi, what is th CORRECT way to check the oil level? Take it for a short ride 3-5 miles then check when i get back, is what i have been doing. But i am never sure how long to let it stand before i check it, as after a certain time i understand that the oil drains back into the sump?
Crusty

Kev	14-08-10 08:13

You must check the oil level as soon as you come back from your short ride, you do not need to let it stand.

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