PeachParts Mercedes-Benz Forum - View Single Post - Poor mileage on my 85 300D--replace Injectors or IP?

Apotheoun · #28 11-18-2006, 04:35 PM

To follow up, I did a valve adjustment today. Wow, what a difference!

Most valves had too tight a clearance, while a three were found with too great a clearance. I adjusted each to .10mm for the intake, and .30mm for the exhaust. Here's the breakdown of the clearances before adjustment:

cylinder 1:
exhaust-.23mm
intake---.0 too tight to measure

cylinder 2:
intake---.08mm
exhaust-.38mm

cylinder 3:
exhaust-.19mm
intake---.15mm

cylinder 4:
intake---.0 too tight to measure
exhaust-.33mm

cylinder 5:
exhaust-.28mm
intake---.0 too tight to measure

So, the readings were all over the place. I wonder if someone did a botchy adjustment in the past, or if these valves have been neglected for some time? Is this kind of variance normal to find?

The engine idles smoother, makes considerably much less smoke, has more power, better braking action upon de-acceleration, and sounds meaner. I hope the fuel economy improves a little.

I checked the timing chain stretch, and it looks to be between 5 and 7 degrees off from perfection. Is this within acceptable limits? How stretched should a chain be allowed to become, before changing it?

By the way, I just was not listening well enough before. OF COURSE the turbo works fine!

Carrameow, sorry for piggy-backing on your thread. I'd love to see you working on one of your cars sometime. I can't be too far away from you. Great website! You do great work! Where does one get a good can of Midnight Blue paint?

Thanks all,

Garth