PeachParts Mercedes-Benz Forum - 1985 300D engine rebuild

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Let's see,

I think it was a cast-in diamond shape on the yoke of the u-joint. Anyone with experience doing flex disks shouldn't make a mistake. Have you discussed it with the shop? Ie- it now has a vibration? Maybe the transmission wasn't centered or the drive shaft cocked a little when things were tightened up.

Balancing. I'm sure if you find some older car books -this will be described. Using two hose clamps close to the differential(we're talking in the one=piece world right now). Have the two clamps where the screw's are 180 degrees apart perfectly. This won't change the balance. Then rotate them say 30 degrees and drive the car. Mark the starting point... go and find the place the driveshaft seems sweetest.

Hope it helps...

Michael

May give this trick a try next time I'm "foolin'" with my cars. Regarding flex discs issues, any changes were prior to my ownership. On the 240 they are cracking (small hairline drying out type) so perhaps this is my problem. I do almost all my own work so I may just replace both (for "fun") to see if there is any improvement.

Will also check the driveshaft alignment as well.

Thanks for the help.

Phillip.

Quote:

Originally Posted by engatwork

It looks like the engine in my 300D is starting to get pretty tired. A few months ago I pulled the cyl head and had new guides and seals installed. Now it looks like doing that work has brought out the fact that the lower end is starting to get tired. It runs real rough when cold and shakes pretty bad at idle. If you do not give it fuel when cold it shuts off. It does run out good on the highway and you can't tell anything is wrong with it except the heavy smoke on full throttle acceleration. I tested compression on all five cyl this evening and found #5 only got up to around 160 psi. 1-4 were over 200. Also, I put #5 at TDC and put compressed air to it and it pressurizes the crankcase. I am trying to decide whether to do a rebuild as a winter project or just part it out. I figure new sleeves, pistons, and crank bearings would get it back to where it needs to be. I kinda hate the thought of parting it out because it rides/drives pretty doggone good. What do ya'll think?

Just curious how it is holding up.
Was it worth rebuilding, with 20/20 hind sight, or would you swap it today?

Quote:

Originally Posted by whunter

Just curious how it is holding up.
Was it worth rebuilding, with 20/20 hind sight, or would you swap it today?

I don't know what Jim did with the original engine, but the car (with the engine and tranny that he swapped in) has been my daily driver since last August. It shows ~260k on the odo, and I'm putting on another 1k or so each month.