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Techical Discussions => Tech- - Engine => Topic started by: attkrlufy on December 19, 2008, 06:58:46 PM

Title: Cold = Blue smoke, warm = none??
Post by: attkrlufy on December 19, 2008, 06:58:46 PM
The title pretty much says it all.

After meeting w/ Firedome last weekend, I decided to take his advice and run my car once a week for 15 min or so, since I can't drive due to all the road salt that's out.

So, I start up the car (360 4v) and it runs rough for a few minutes (temp hasn't gotten above 35 here in weeks).  There's definitely blue-ish smoke coming out the exhaust while the car's warming up.  After it's warm, the exhaust is clear.  This has now happened twice.

My guess is some engine part is experiencing "shrinkage" (The pool-water was cold, I swear!) and is letting oil into the combustion chamber while the engine is cold, but it expands enough to block the oil after warm-up.

What's causing that?  Piston rings....valves.....something else?  I've got worn valve seals (thanks Firedome) because I get a blue "puff" at startup regardless of temp....would that be the cause?


Title: Cold = Blue smoke, warm = none??
Post by: Steve on December 19, 2008, 07:15:33 PM
Valve seals
 
They harden after all these years and become very brittle.  Sometimes they just break off and lay inside the spring.  The oil seeps down the valve from the head over night and soaks it.  When you start it, the hot gasses burn it off and the blue smoke is gone in less than a minute.
 
One word of caution. . . If the seals break off, they eventually shatter and end up in the pan.  But in most cases, the pieces lay in the head.
 
POLARACO2008-12-20 00:18:12
Title: Cold = Blue smoke, warm = none??
Post by: firedome on December 20, 2008, 06:00:55 AM
That's what I thought too... costs around $250 or so at a shop as I recall.

Title: Cold = Blue smoke, warm = none??
Post by: Robert Rottman on December 20, 2008, 07:04:14 AM
Yeah, My first 70 Fury III did that too. After a few minutes of running all was well. That car ran like champ. 318 engine...I never did change the valve seals...most likely the next guy did...He didn't even care that it had this problem. Common....
 
Bob
Title: Cold = Blue smoke, warm = none??
Post by: Snotty on December 22, 2008, 10:43:59 AM
You sure you car doesn't have a Chevy motor?  This is very common with Chevys!
 
Of course your problem will eventually get worse, but it's not a "killer" at this time.  Just be sure to keep your oil level proper.
Title: Cold = Blue smoke, warm = none??
Post by: Stan Paralikis on December 22, 2008, 11:36:22 AM
If it was my car, I'd do nothing....
Title: Cold = Blue smoke, warm = none??
Post by: Matt Aker on December 22, 2008, 04:07:04 PM
My Coupe DeVille has an Olds 350 in it and I dump a bottle of Lucas in the crankcase at every oil change.  NO startup smoke...
 
Lucas would prolly werk on a 318 too.  Some here do not like it, but I think Lucas WORKS!
Title: Cold = Blue smoke, warm = none??
Post by: Steve on December 22, 2008, 04:08:06 PM
seals are probably too far gone for the Lucas
Title: Cold = Blue smoke, warm = none??
Post by: Matt Aker on December 22, 2008, 04:10:49 PM
I have NO idea how many miles are on this 350....  the engine's older than the car.  I works if used as directed, just like Tylenol.
Title: Cold = Blue smoke, warm = none??
Post by: Brian on December 22, 2008, 05:01:40 PM
Had to change the valve stem seals many times on various cars over the years...if you have the tols and the know how then it's not a bad job to do yourself...but your back will probably hurt in the morning.(http://www.moparfins.com/forum/smileys/smiley2.gif)(http://www.moparfins.com/forum/smileys/smiley5.gif)
Title: Cold = Blue smoke, warm = none??
Post by: Leaburn Patey on December 22, 2008, 07:05:11 PM
Dippy puffs if she sits for a few days.She does not like sitting.
She takes a licking and keeps on ticking!! (bad lifter)
Title: Cold = Blue smoke, warm = none??
Post by: Brian on December 23, 2008, 04:33:19 PM
Quote from: CBarge
Dippy puffs if she sits for a few days.She does not like sitting.
 
With these cold mornings, -10-20C,  the old dodge ram's 360 been rattling pretty good on first fire-up....(http://www.moparfins.com/forum/smileys/smiley4.gif)
Title: Cold = Blue smoke, warm = none??
Post by: Arlen Vander Hoff on December 24, 2008, 05:07:02 PM
Yes for what its worth I agree valve seals are getting bad. And once again I agree with Stan the man , I wouldn't worry about it as long as its just at start up.
Title: Cold = Blue smoke, warm = none??
Post by: firedome on December 25, 2008, 03:25:56 AM
My experience is they don't tend to use much oil like as if it had bad rings...it can prolly be ignored, but I'm a perfectionist when it comes to engines and don't like to see blue smoke anytime!
Title: Cold = Blue smoke, warm = none??
Post by: Steve on December 25, 2008, 05:50:52 AM
Quote from: CBarge
Dippy puffs if she sits for a few days.She does not like sitting.
 
Dippy has 8 houses but only 7 are occupied too. (http://www.cumminsforum.com/forum/images/smilies/smilies-2008/party7500.gif)