Grizzly 660 oil leak - Grizzly Riders - Yamaha Grizzly ATV Forum

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post #1 of 8 (permalink) Old 03-03-2011, 10:21 PM Thread Starter
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Grizzly 660 oil leak

I have a yamaha grizzly 660 and it has a bad oil leak. Oil is coming out near the exhaust manifolds. I have pulled the spark plug and noticed a little oil in there too. Any help please.
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post #2 of 8 (permalink) Old 03-03-2011, 10:56 PM
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Sounds like maybe a bad head gasket or valve seals. Also could be a oil seal in the head.
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post #3 of 8 (permalink) Old 03-03-2011, 11:06 PM
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Welcome! Where exactly is the oil coming from? What year 660? How may miles?

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post #4 of 8 (permalink) Old 03-04-2011, 10:06 PM Thread Starter
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i think its an 04. its not mine its the ranches, i use it to gather cattle. i havnt pulled the engine out yet. after it runs for a minute or so, i can see a oil coming from the valve cover, between the exhaust manifolds, but i cant see exactly where its coming from. If i remember right it has about 3000 miles
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post #5 of 8 (permalink) Old 03-04-2011, 10:28 PM
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I am willing ti bet you have some kind of gasket leak with that kind of mileage! More than likely out the intake vale inspection plate. Not sure if this is it or not but a good place to start.

Here is a service manual to help you out.
http://www.moddedraptor.com/library/...vicemanual.pdf

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post #6 of 8 (permalink) Old 03-04-2011, 10:59 PM
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There are a few simple steps to follow to try to see where the oil is coming from BEFORE
you pull out the engine.

First off - take a good look at where the oil is and follow the stream upwards to the source; Remember
that oil does not run uphill.
Next - try to clean the motor with a good foaming engine cleaner to remove the old oil

I would take a good look at the following:

Two round lifter covers in the front of the head - these have o-rings that could be dry or the caps have come loose.
The large single lifter cover in the rear of the head - this also has a rubber gasket
The valve cover itself - this has a gasket and it's possible the bolts have vibrated loose - a simple retorque could solve your problem
there are two (2) oil delivery lines on the top of the head - they have banjo bolts w/ cooper washers - if they came loose they will leak oil as well.

None of the above will cause oil to be on the spark plug unless you meant on the outside of the plug.
if there is oil on the outside - that was caused by the oil dripping down into the plug galley.
If the oil is on the electrode - you most likely have bad valve seals - JMO

Good luck and please let us know what you find.........................



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post #7 of 8 (permalink) Old 03-04-2011, 11:07 PM
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If the valve cover is leaking its just yamabond. All you need to do is pull it off...yamabond it up and slap it back together. You don't have to pull the motor.

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post #8 of 8 (permalink) Old 06-14-2015, 08:48 PM
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engine not smokeing but oil is geting built up in carborater fliter
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