[Vwdiesel] 1.5NA in an A2 Jetta?

[LBaird119 at aol.com]

In doing some research I
discovered that I could not simply use the good FI pump off my 1.6.  They
are different.  Injectors are different, head is different, head gasket is
different, block is different (bore at least).


  Hate to burst your bursted bubble but You can bolt pretty much ANY pump 
onto any of the pre TDI VW engines and go with it.  The only differences 
anybody has found (other than the Vanagon throttle arm pumps) is some 
have longer or shorter "check valves" where the injector lines come out 
of the pump.  Your 1.6 pump should bolt right onto the 1.5 if you use the 
pump mount from your 1.6.  If you use the 1.5 mount then you have to 
tighten all three front pump mount bolts from the pump side whereas 
the 1.6 uses a nut you access through the pump pulley for one of 
them, the bottom one.
  Yup injectors are different but completely interchangeable.  Kinda like 
using a 175/70 tire in place of a 155/80.  Different tire but same diameter 
and works equally well for rolling the car down the road and speedo 
accuracy.
  Head gasket is different yes because the bolt hole and oil return hole 
sizes are different with a little dependancy on the year.  Block is different 

but the 1.6 has all the same mounting holes and bosses of a 1.5 plus.
  Bore is the same, stroke makes it a 1.6 vs a 1.5 but pin to top height 
as well as pin diameter is different.  
  Save the gas for cold weather if needed.  Use 2 cycle oil or buy some 
Stanadyne fuel additive if you really want to help clean things out.  Check 
it out at www.dieselpage.com.  Be sure to pull your "OUT" banjo bolt 
and clean out any crud that might be around or plugging the tiny metering 
hole in it.  Your injectors may be gunked up a bit and odds are that if they 
are, half at best will clear out.  :-(  You can swap in the others if you 
like 
but with the age of that engine, they're probably not in the best shape 
either.
  It's entirely possible your 1.6 engine is just gunked up from improper 
oil.  A little soaking of the rings, cleaning or swapping the pickup 
section of the oil pump might take care of most of the blowby and 
the oil pressure.  Of course you could have bad intermediate shaft 
bearings blowing the oil pressure too.   Hard starting could be bad 
glow plugs or low compression which could be stuck rings or really 
worn rings.  It's not typical for blowby to be so bad the engine won't 
run, etc.  A couple here have had a broken ring and heavier oil use 
and a slight miss was the main symptoms as I recall.
  For the most part a 1.5 and 1.6 is interchangeable.  The big thing 
to watch with a 1.5 into an A2 body is that all the mounting holes 
are there for the motor mounts, PS pump, etc.  Otherwise it'll drop 
right in.  :-)
    Loren