Bought a 2006 rhino 450 this summer. Previous owner stated it overheated, he kept running it until it stopped, and then he couldn't start it again. When I drained the oil, it was bad, very milky, very thick. I poured diesel into the dipstick hole with the drain plug installed, let it sit overnight and then drained. It did this a couple of times.
I rebuilt the top end (new jug, piston, rings, all gaskets, valves, springs, etc) and the water pump. Of course I added new oil, filter, and new coolant. I did use the coolant bleeder screw to get it properly full.
Got it running and zipped around the yard a few times. Parked it and as I was listening to the motor, I hear "tap tap". Shut her off and checked the tappet clearance. As I was adjusting them a few thousandths, I notice the oil around them is milky. Checked the dipstick--milky! Aarrgg! I did notice that the coolant was an ounce or so low, but I thought that could be due to air in the system after drain and refill.
I second guessed myself and put on a new head gasket, rebuilt the water pump again, refilled everything. Got her started, zipped around the yard a few times. Parked, shut off, checked the dipstick. Milky again!
No smoke out the tailpipe. No sweet smell like coolant burning. No oil burning smells.
Did I overlook something in the rebuild? Where could the milky oil be coming from? Is it possible that this is residual from the previous owner's mess? Should I just assume it will take a couple of oil changes to get everything back to normal? I'm at my wits end.
2006 Yamaha Rhino 450 milky oil after rebuild
in Yamaha UTV SxS Forum
Posted
Bought a 2006 rhino 450 this summer. Previous owner stated it overheated, he kept running it until it stopped, and then he couldn't start it again. When I drained the oil, it was bad, very milky, very thick. I poured diesel into the dipstick hole with the drain plug installed, let it sit overnight and then drained. It did this a couple of times.
I rebuilt the top end (new jug, piston, rings, all gaskets, valves, springs, etc) and the water pump. Of course I added new oil, filter, and new coolant. I did use the coolant bleeder screw to get it properly full.
Got it running and zipped around the yard a few times. Parked it and as I was listening to the motor, I hear "tap tap". Shut her off and checked the tappet clearance. As I was adjusting them a few thousandths, I notice the oil around them is milky. Checked the dipstick--milky! Aarrgg! I did notice that the coolant was an ounce or so low, but I thought that could be due to air in the system after drain and refill.
I second guessed myself and put on a new head gasket, rebuilt the water pump again, refilled everything. Got her started, zipped around the yard a few times. Parked, shut off, checked the dipstick. Milky again!
No smoke out the tailpipe. No sweet smell like coolant burning. No oil burning smells.
Did I overlook something in the rebuild? Where could the milky oil be coming from? Is it possible that this is residual from the previous owner's mess? Should I just assume it will take a couple of oil changes to get everything back to normal? I'm at my wits end.