[W126 Coupe] Rough idle

[Shin Takei]

 When I was involved in restoring Ferraris, we saw plenty of engines that have beed overheated resulting in a similar situation. Like Jonathan says, a flat egde must be used to determine the ammount of irregularity, We would then sand the head, manifold and cam covers to carefly flatten the surface. Then we adjusted the tolerance with a thicker gasket.

Shin


 


 

-----Original Message-----
From: Marcus Johnson <ubucom at optusnet.com.au>
To: mbcoupes <mbcoupes at mbcoupes.com>
Sent: Wed, 6 Aug 2008 5:48 am
Subject: [W126 Coupe] Rough idle










Thanks for the input, Jonathon.



Overheating could be a possibility.?



There was an indication of water leaking into the valley area and some pretty rusty areas in there. You can see evidence of that on some of the pics on my blog pages.




My guy thought the lack of seal or warping might have been the result of previous head work or may have even been there right from the start.




However, my intuition says that with an engine like this, the factory would have never let that through.




Could also be that the guy who did the heads got it out of whack. They had to do some welding, so perhaps the heat caused the metal to warp.




What also seems odd is that the rough idle comes and goes quite sporadically.




Seems more noticeable / worse after getting back into the car after it has cooled down from driving.




No problem to take the manifold off and give it a test for straightness as suggested. We've had it on and off plenty lately.





marcus



 
marcus johnson
 
1985 380 SEC
 
melbourne, australia
  



=


 





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