Posted for "Gerard O Connell" <goconnell@dodo.com.au>:

 afternoon guys,
 
 when I asked the LAME"S to investigate the vibration   the spark plugs were
removed for testing and subsequently one new plug has been installed due to a
faulty item being detected.   An induction leak was also detected at the
intake tube of No. 2 cylinder.  Following gasket replacement and intake
re-assembly, engine ground runs were carried out with satisfactory results.
  Continuing on with the inspection a lack of clearance was found in two
locations, possibly causing a "knocking" sound.  The first being between the
exhaust tailpipe clamp and firewall and subsequently the clamp was relocated
to provide adequate clearance, secondly between the engine sump and oil cooler
fitting of the R.H. oil cooler with damage to oil cooler, cooler mount and
fittings as a result.   I have been informed that the R.H. oil cooler is
required to to stabilize engine oil operating temperatures.  As a result air
flow over the coolers and oil flow through the coolers requires improving
before a smaller oil cooler can be installed to give adequate clearance.   It
is also possible that the vernatherm valve is not functioning correctly,
resulting in a lack of oil flow to the oil coolers and I.A.W. S.B. No. 518B
should be inspected before progressing.    What oil coolers are people using
and are the results good?   Regards,   Gerard