EdwardK Posted November 1, 2013 Report Share Posted November 1, 2013 Exactly as the title says. When I first crank the 620 up I get a fine mist of oil spray coming out of my straight pipes. Once the engine has idled for about five minutes or so she stops. Also worth noting, the oil spray is greater on cold mornings and the smoking less when it's cold. Vise versa for warm weather. Runs fine, smokes (of course), and uses about a quart of oil every other week or so. I know I have a stripped out headstud and a leak in the head there, but I'm wondering if maybe my rings are going too? Any ways to easily check this stuff? And how serious of a problem would you guys consider this? This is currently my only driver, so I'm working on getting the 610 patched up so I can have something to drive when I go to fix this one. Quote Link to comment
datzenmike Posted November 1, 2013 Report Share Posted November 1, 2013 Is it oil? or just carbon mixed with condensed water vapor? Could be just bad oil seals on the valves. These are easy enough to replace without taking the motor apart. Quote Link to comment
]2eDeYe Posted November 1, 2013 Report Share Posted November 1, 2013 Could be fuel as well. White smoke = coolantBlue smoke = oil Black smoke = fuel As Mike said valve seals would let oil past on startup if they are bad. A quart of oil a week seems to be excessive to me though, so you may have rings going out. 1 Quote Link to comment
ggzilla Posted November 1, 2013 Report Share Posted November 1, 2013 Oil smoke is serious. It pollutes and is illegal. But it won't hurt reliability. Will run for years like that. Based on the symptoms you listed, it is caused by the head not the rings. Valve seals are broken along with maybe worn valve guides. Quote Link to comment
EdwardK Posted November 1, 2013 Author Report Share Posted November 1, 2013 Is it oil? or just carbon mixed with condensed water vapor? Could be just bad oil seals on the valves. These are easy enough to replace without taking the motor apart. Could be fuel as well. White smoke = coolant Blue smoke = oil Black smoke = fuel As Mike said valve seals would let oil past on startup if they are bad. A quart of oil a week seems to be excessive to me though, so you may have rings going out. It's oil. [Edit: Nope! Mike's right it's carbon buildup mixed with water I believe. It has no lubridity what-so-ever. It's just black and makes everything on the ground behind my truck ugly in the morning. lol] I replaced my valve seals about two months ago and I smoke a hell of a lot less now than then. I also use less oil, but it's still excessive, yes. So you guys don't think it could be related to the stripped head stud? (I mean, I don't want it to be related to that. But, yah know... I'd rather that be the problem than the rings.) Oil smoke is serious. It pollutes and is illegal. But it won't hurt reliability. Will run for years like that. Based on the symptoms you listed, it is caused by the head not the rings. Valve seals are broken along with maybe worn valve guides. That... Depends on where you live. lol And like I said I replaced the valve seals... Though, I haven't touched the guides... Quote Link to comment
dr.feltersnatch Posted November 1, 2013 Report Share Posted November 1, 2013 , but I'm wondering if maybe my rings are going too? Any ways to easily check this stuff? 1 Quote Link to comment
datzenmike Posted November 2, 2013 Report Share Posted November 2, 2013 The choke should only be on for less than ten minutes. During that time you may get some black on the tailpipe. Check when warm that the choke has shut off. Excessive oil burning from rings can also soot up the tail pipe. Quote Link to comment
datzenmike Posted November 7, 2013 Report Share Posted November 7, 2013 Yes fuel. Over rich from Carb flooding Stuck choke. Choke heater not working Rebuilt carb and primary and secondary jets swapped by mistake. Dirty air filter Quote Link to comment
EdwardK Posted November 7, 2013 Author Report Share Posted November 7, 2013 Well as far as fuel goes. Pulled the airbox off and found the choke wasn't actually connected. It was stuck open... Quote Link to comment
ggzilla Posted November 7, 2013 Report Share Posted November 7, 2013 Choke stuck open will not cause oil to come out of the tailpipe. If the engine starts fine the choke is not needed. Quote Link to comment
EdwardK Posted November 7, 2013 Author Report Share Posted November 7, 2013 Choke stuck open will not cause oil to come out of the tailpipe. If the engine starts fine the choke is not needed. We've already concluded it wasn't oil. Just a mixture of carbon build up and condensation. Quote Link to comment
datzenmike Posted November 7, 2013 Report Share Posted November 7, 2013 And that would be normal on most carb motors unless the carbon build up is excessively so. Most carb motors have some carbon in the tail pipe. Quote Link to comment
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