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blue/white smoke out of exhaust

  • Thread starter Thread starter GateKeeper
  • Start date Start date
G

GateKeeper

Guest
OK, I am a bit puzzled and a bit concerned.....

Sunday I changed the oil in the bike, and the oil filter as well....

Some dripped onto the wrapped header and is now smoking like a SOB, but that is not my concern, what is my concern is the blue and white smoke now coming out of the exhaust pipe, mostly on initial start up, goes away but not fully after a good warm up, revving the engine will produce more of the smoke until warmed up,,,, but I think I need to be concerned and I think I need to do something but what ? new rings ? do I need to pull the whole engine out to do this ?

This engine has never been pulled apart, it has had small leaks, but nothing major, and now I am seeing more and more oil weeping near the top left portion of the engine at the top cooling fin.

Am I in for an engine rebuild this winter ? Ohhhhh I hope not...

Anyone close by that wants to do it, on the cheap, I don't know if I have the energy, time or willingness, I am trying to get my Yamaha completed, I really don't want another project...

And should I stop riding the bike, before I cause major damage...

Thanks for and all info

Oil used was Rotella 15W40

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Did all the smoking from the exhaust just happen after the oil change? If so did you change the type of oil or brand of filter?
 
It's now more predominant than what it was before, had a slight hint of this prior to the oil change.

Oil is different from before, filter is somewhat the same very similar, different manufacturer.

.
 
I don't believe so, followed the manual, if I remember correctly it was 3.8 liters if the oil filter is changed, I will have to check the sight glass to confirm, I thought it was on the mark, bike was level on car jack stands on the swing arm.

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Castrol

0281826_1


not the same weight as whats on the picture

right now it's this

0287930_1


.
 
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GateKeeper said:
I don't believe so, followed the manual, if I remember correctly it was 3.8 liters if the oil filter is changed, I will have to check the sight glass to confirm, I thought it was on the mark, bike was level on car jack stands on the swing arm.

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Click to expand...

3.8 liters sounds like too much, even with a filter change. I think my 750 was 3.6 QUARTS with a filter change.
 
I was thinking maybe some chep oil had caused a lot of sludge to build up, the new better oil might remove some from the rings or valve stem seals or something, might let it smoke a little more. That's not it, Castrol is good.
 
no sludge came out, the old oil was black but nice, flowed out really nice, no clumps or anything, I even left it to drain overnight....

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earlfor said:
3.8 liters sounds like too much, even with a filter change. I think my 750 was 3.6 QUARTS with a filter change.
Click to expand...

According to the manual

oil change 3.2L or 3.38Qt
filter change 3.8L or 4.02Qt
overhaul engine 4.0L or 4.23Qt

I just went out and checked, and putting the bike level I see the oil at the top of the sight glass....

Hmmm I guess there is too much oil possibly.....

I will extract some and see if it cuts down the smoke.....

Perhaps I did not wait long enough after shutting down and checking the level, but I did measure the amount I put in, so the manual is wrong ?

I don't know.....

.
 
Usually all of the oil doesn't come out, but I wouldn't think just a little bit too much would make it smoke.
Can't hurt to let some out I guess.
 
I will drain some out, and see, it's not like I put in a whole liter more, maybe a half cup if that more, but that would be about it....

I will see if I can get it out tonight, and see how it starts up in the morning...

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OK, I drained out some of the oil, about a half cup or so, I will see in the morning on how she runs, and at lunch, and after work.....

I did manage to break my mirror in the process, as I was wiping up the floor of any oil drips to make sure I have no leak by morning, as I was straightening up my shoulder hit the left hand mirror with enough force it broke the plastic cup that more or less holds the bloody thing in place so it don't swivel around, now I need new mirrors....

A guy just sometimes can't catch a break....

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Measure the oil level per instructions from the Factory Suzuki Service Manual. You should not just randomly remove oil because you think it may be over filled. To measure is to know.

Most likely the engine needs a freshening. Valve stem seals often dry out and leak after 30 years. Could be rings too, but that's more high mileage related.
 
Nessism said:
Measure the oil level per instructions from the Factory Suzuki Service Manual. You should not just randomly remove oil because you think it may be over filled. To measure is to know.

Most likely the engine needs a freshening. Valve stem seals often dry out and leak after 30 years. Could be rings too, but that's more high mileage related.
Click to expand...

I put in what the manual said 3.8L this put the level to the top of the sight glass, so I drained a bit and it's now in between the 2 marks more or less midway of the glass.

she started up and some smoke was there this morning, but I don't think as much as yesterday, but I will see how she does over the course of the day, have to go out for lunch, then back to work, then home, and it was at these times I noticed the increase of smoke....

I only removed about a 1/2 cup more or less last night, so it's not really a whole lot.....and I am not low....that is still a good thing...

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Just a thought,

When you drained the old oil, did you notice how much came out? Did the full 3.8l come out? Not many people measure how much gets drained so dont worry about it, but if you noticed a slight bluish tint to the exhaust in the first place, you are starting to burn oil, and it will only get worse. So, if the level was down when you drained, then refilled with the proper amount, your oil pressure went up, and your leaky rings just got "leaker". If you were running a lesser amount than 3.8l, your oil pressure was less, hence less being forced past the rings.
 
cableguy said:
So, if the level was down when you drained, then refilled with the proper amount, your oil pressure went up, and your leaky rings just got "leaker". If you were running a lesser amount than 3.8l, your oil pressure was less, hence less being forced past the rings.
Click to expand...

This is pure BS. Oil pressure is not dependant on oil quantity, unless there isn't any.

Oil coming through the rings is not dependant on oil pressure anyway, there is no oil pressure being pumped to the rings. Oil is pumped as far as the engine bearings, and thats it.
 
GateKeeper said:
OK, I am a bit puzzled and a bit concerned.....

Sunday I changed the oil in the bike, and the oil filter as well....

Some dripped onto the wrapped header and is now smoking like a SOB, but that is not my concern, what is my concern is the blue and white smoke now coming out of the exhaust pipe, mostly on initial start up, goes away but not fully after a good warm up, revving the engine will produce more of the smoke until warmed up,,,, but I think I need to be concerned and I think I need to do something but what ? new rings ? do I need to pull the whole engine out to do this ?

This engine has never been pulled apart, it has had small leaks, but nothing major, and now I am seeing more and more oil weeping near the top left portion of the engine at the top cooling fin.

Am I in for an engine rebuild this winter ? Ohhhhh I hope not...

Anyone close by that wants to do it, on the cheap, I don't know if I have the energy, time or willingness, I am trying to get my Yamaha completed, I really don't want another project...

And should I stop riding the bike, before I cause major damage...

Thanks for and all info

Oil used was Rotella 15W40
.
Click to expand...
" This engine has never been pulled apart, it has had small leaks, but nothing major, and now I am seeing more and more oil weeping near the top left portion of the engine at the top cooling fin."

You may want to consider re- torqueing the head to factory spec. The head gasket should reseal and the weeping should go away. It may also help with any possible compression lose. Also for the oil burning, these are low pressure engines, what’s burning may be the valves oil seals leaking a bit. Rotella 15W40 maybe a seem THICK for the engine, but the type of oil is a good choice, there is a lot of ZINC which help lubricate these old engines.There is a article on the MAIN page that may help you out. “More Than You've Ever Wanted To Know About Motor Oil”

http://www.thegsresources.com/garage/gs_oil.htm
http://www.thegsresources.com/garage/gs_engcutaway.htm
 
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Well, so far it's going like this...

Went for lunch started the bike up, some smoke but not a lot, not as much as yesterday, but more than before the oil change.

So I possibly had a bit too much in there, now looking at the sight glass, even with the bike running, it's more or less in the middle, this is a good thing.

But I am now finding the bike is being a pain in the arse to stay at idle more so than it used to be in the past.....

I think

a) it's time to redo the motor, seals, rings, etc....

or

b) get rid of the bike, with full disclosure, and purchase something newer.....

I like the old girl, but the thought of wrenching on her again, I am really not that much in love with her.....

sigh.........

.
 
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