Re: IML: oils and pinion seals

["mike and linda sutton" <mikanlin62@xxxxxxxxxxx>]

Regarding the " what weight oil to use " thread today, Dick B. was right 
on - as usual - on this, I have been using DELO 400 15-40 for years in my 
engines, its primarily used for over the road diesel engines but is an 
excellent all around oil.

Point of my post, in several Mopar and other performance oriented magazines 
lately there has been discussion of how the modern oils are not doing as 
well in preventing cam and lifter face wear as the older oils in engines 
such as ours.  While not to debate the engineering marvels of the newer 
engines and oils,  the articles basically say that the newer oils are 
designed for high miles per gallon, low emissions and engines that are 
primarily overhead cam designs.  Apparently they are lower in a zinc 
additive -  I cant recall the exact chemical name - which helps reduce the 
cam lobe and lifter scuffing.  It went on to add how a couple of additives , 
one was a GM cam break in product the other was Alemite CD-2, had that 
particular additive.  So there is some food for thought.

One other thing, depending on the year of the car, a Mopar 8 3/4 rear such 
as found in our Imperials may or may not have a crush sleeve behind the 
pinion flange.  Those came into play in the late sixties early seventies, 
only the model 742 rear end with the large diameter pinion shaft had them. 
The earlier cars used a shim pack, which works fine and can be reused with 
no worry as long as the pinion shaft and bearings are not removed, which in 
case of replacing a pinion seal would not be.  One caveat, the torque on the 
pinion nut is something in the range of 230 or so foot pounds,  I dont 
recall the exact amount but its the most highly torqued item on the entire 
car.  I tend to leave them alone and find a piece of cardboard placed under 
the drip can be replaced far easier.

Have fun

Mikey
62 Crown Coupe 


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