MB001293

[quk@isham-research.demon.co.uk (Phil Payne)]

MB001293 is still in pieces in my garage.  As the house sale and move
is approaching (damn these divorces) I decided that the best way to
pack up all the pieces was to rebuild the thing.  So I've started.

Point 1:  What are the bores like?

Optically, they're OK - with only a faint ridge above the upper piston
ring travel point.  But are they round or oval - within specification or
not?

I bought a Draper bore measurement device - it's a T-shaped thing with
the ends of the T spring loaded and controled by a locking screw.
Compress, lock, insert, open.  Click.  Remove and measure with a normal
micrometer.

I may have a systemic error:

                Top                    Bottom
                Along     Across       Along       Across
     #1         80.98     80.95        80.88       81.02
     #2         80.97     80.96        80.89       81.07
     #3         80.91     80.96        80.84       80.98
     #4         80.96     80.97        80.94       81.00
     #5         80.99     80.98        80.91       80.96

(All the average of three separate measurements, etc., although this
 technique yields _very_ repeatable results.)

These are almost all less than the supposed nominal - 81.01 - has anyone
else seen this, or should I get the caliper calibrated?  It's a while
since it was done, but the values it gave for the crank journals and the
main bearing journals were very credible.

Point 2: What are the crankshaft bearings like?

I decided to try Plastigage, which is known over here as 'Plastigauge'.

Wonderful stuff - all main bearings within a gnat's cock hair of 0.063
mm clearance - #3 the largest at 0.074 mm.

--
 Phil Payne
 UK Audi quattro Owners Club
 Phone: 07785 302803   Fax: 0870 0883933