[Vwdiesel] Oil pressure

[Val Christian]

I'm not 100% on this, but I believe that the VW industrial diesel
engine, we later knew as a 1.5 diesel, was used as a 1.4 and 1.5
diesel well before the first Rabbit.  That diesel power plant was 
frequently used as a pump motor for amusement parks, irrigation, and
other similar applications.  

It is possible that the gasser was really an adaption of the original
diesel powerplant.  However, the very early diesels had the openings
for the distributor, and for the crankcase recirc.  

If someone has early Bosch pumps, they may see that pump publication
showing the pump in 73, and perhaps 71.  

Perhaps someone has better information than I do.  Part of my information
came from a early VW service manual that I got to look at in 77.  The 
factory manuals were scarse, and one of the mechanics had a stationary
powerplant service manual for the VW diesel.

Val


> 
> >>Someone give me reasons for the insanity?
> 
>   Because!  That's why.  (That's what my Dad always told me anyway!)
> 
>   I believe it has a lot to do with VW's (as well as most German and many 
> Euro marques) tendency to NOT reengineer everything every two to three 
> years just to make you want the new model.
>   It's the same basic casting as it was back about '75, when it was gas, 
> had a distributor and a fuel pump.  You notice the holes area still 
> there for those.  We just use them for a vacuum pump and crank 
> vent.  Thus the std. joke of being sure you get the vacuum pump 
> timing set correctly.  Although it does have to be one of two positions 
> 180 apart.
>   They didn't keep the cogged int. shaft drive because then the injector 
> pump would be slip fit to the belt, unless you added a longer belt and 
> another idler.  Franz probably suggested THAT.
> 
> > >>Anyone know of a source for the pre-honed int. shaft bearings?
> 
>   Most places have them, you just have to be sure which you are 
> getting or your hands will be really sore by the time you're done 
> hand honing to fit.  Ugh.
> 
> > >>What keeps the int.shft bearings from spinning and blocking their own oil 
> > 
> > >>passage? Just interference fit?  
> 
>   Just friction.  That's why the clearance between the shaft and the bearing. 
>  :-)
>  
> > >>Why isn't there a groove in the bearing or
> > >>bearing surface on the shaft to distribute the oil pressure around the 
> > whole >>shaft? 
> > 
>   Well, there are none on the cam, none on the rods and only halfway around 
> on 4 of the 5 mains.  There is a groove on one of them, to direct oil at the 
> vacuum pump gear so even though one is larger than the other and can't
> be mixed up, the one CAN be put in backwards.  Make sure the holes 
> line up with the holes too.
> 
>   '91 ECO PROBABLY has the 36mm gears.  AFIK it's 26mm gears up to 
> somewhere from 81 to 84.  Then they went to 30mm by '85 or earlier.  
> Then the 36mm came out on a 1.8 Audi.  That's where I got my first two 
> applications of it from.  Had to swap drive shafts due to length.  So, I 
> presume the 36mm came out on the diesel for the TD, hydraulic head. 
> Since it's feeding a turbo, hydraulic lifters and oil squirters.
>      Loren
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