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  #1  
Old 02-14-2009, 09:48 AM
Takernz_30's Avatar
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Smoking M115 from my friend's '74 200

guys,

My friend called me at 8am Sunday and asked me to come over his place and needs my help with his '74 200, after that, I took a light breakfast and grab my keys and drive up my '66 200 to his place, as I arrived and pulled up right behind his car outside his house, and I start his car and as soon as the engine fires up, I looked back and I saw bit thick bluish smoke at cold start-up, the idle was perfect, as the engines warms up, at around 80C the smoke becomes a light-blue haze at idle but giving some gas, a nasty thick blue smoke from behind , and I shut it off.

We talked about his car as we waited for the engine to cool down, he said that his engine was recently rebuilt and as I visual inspect his engine that the rebuilt was neat, no leaks anywhere, as the engine was cool enough to crack open the spark plugs, the plugs were not oily, it was brownish just like as normal, all 4 of them then I get back to my car to get my long flat screwdriver and I poked through the plug hole to reach the pistons and I gently scrape off the top of it. As I pull the screwdriver up and looked up and wiped the tip with my fingers, as I spread it was oily along some carbon dirt in it.

I told my friend to take your car back to your mechanic who built it, tell him your complaint and he'll be sure to take care of it. As for me, I think it was the piston rings installed in wrong position, I don't know , so what do you think guys? Did I miss something here?

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Old 02-14-2009, 10:29 AM
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What all was rebuilt? How long ago was it rebuilt? Has the head been re-torqued? Have the valves been re-adjusted?

You're asking an open ended question without giving any specifics.

Reminds me of when friends call me for advice on their cars. I tell them," Drive it by the phone a few times so I can fix it for you".
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Old 02-14-2009, 04:50 PM
Pooka
 
Join Date: Sep 2005
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The big puff on smoke on start up and then just light smoke could be two problems as the big puff on start up is normally bad valve guides.

The continues smoking could be bad rings or just one or two valve guides worse than the rest.
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Old 02-14-2009, 10:32 PM
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Quote:
Originally Posted by Mike D View Post
What all was rebuilt? How long ago was it rebuilt? Has the head been re-torqued? Have the valves been re-adjusted?

You're asking an open ended question without giving any specifics.

Reminds me of when friends call me for advice on their cars. I tell them," Drive it by the phone a few times so I can fix it for you".
He said the engine was rebuilt 2 months ago and the engine has finished it's break-in period (over a thousand kilometers), he is not a gearhead unlike all of us here in this forum, he didn't ask his mechanic on what he has done to his engine,e.g. re-torqued, adjust valves,etc... all he wants was getting it fixed and driving it.

I told him that owning an old mercedes needs more attention, keeping an eye on everything when driving,(noises,drivability,etc...), and I told him to start learning how to use wrenches, buying some basic tools, research about his car and it's functions, by joining this forum since he knows how to use internet. I f he can't help himself, he's wasting his money on his car.
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Old 02-14-2009, 10:37 PM
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Quote:
Originally Posted by Pooka View Post
The big puff on smoke on start up and then just light smoke could be two problems as the big puff on start up is normally bad valve guides.

The continues smoking could be bad rings or just one or two valve guides worse than the rest.
what about the valve seals? I heard that nitrile seals are not good and the white seals are excellent, is this true?

Worn valves?
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  #6  
Old 02-15-2009, 12:22 PM
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mercedes shop here sells a nice set, just make sure they are OEM. It does sound like valve seals. After sitting a worn seal will allow oil to drip into piston, hope it is just the seal and not the sleeve.
This can be a DIY job, but it is very tedious

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