What are the differences between CJ and CU engines?

Discussion in 'Mech Tech' started by Neptuneblue, Jun 25, 2014.

  1. thanks guys
     
    Fish likes this.
  2. Hi guys just bought a ‘75 jurgen autovilla from SAfrica , it has the later 2litre CUengine , with hydraulic lifters ( instead of tappets) so I’m told. So my question is: is the info above correct, if the lifters require adjusting - how? as one sounds more tappety ! & do I put the same engine oil in as I already do in my 2litre bay with CJ engine? Thanks Steve
     
  3. theBusmonkey

    theBusmonkey Sponsor

    Lifters and tappets are one and the same.
    Just different terminology.
    Both hydraulic and non hydraulic lifters require some form of adjustment although you will often see the hydraulic variety described as 'self adjusting', which to a degree they are.
    They use engine oil inside a sprung gallery to maintain an interface between the push rod and the camshaft.
    This oil can leak out if the engine is not used regularly and generally speaking is pumped back in by the oil pressure created whilst the engine is running.
    A soft lifter can take up to 15 minutes or so to pump back up again, but in the interim can sound worryingly clattery.
    I have always used 20.50 in our engines, especially when ambient is high. We have a soft lifter on the GE code bay engine and very occasionally the 2.1 wbx in the T3 lets us know it too is no longer in the first flushes of youth. They both calm down after a few miles of sensible driving. If oil pressure us good theres no need to thrash the nuts off the engine to pump the tappet up unless it is so worn its at the end of its service life.
    Hydraulic tappets are set as interference components ie you preload them by using the screws on the valve rockers and non hydraulic tappets are set as clearance components, ie they require feeler gauges to set a gap between the screws and the push rods.
    Id recommend using the procedure of 2 preload turns on the adjuster screws rather than the 1.5 that ratwell recommends.
    Just follow the steps in your workshop manual and all will be well:thumbsup:
     
    jivedubbin and DubCat like this.
  4. This is a CJ:

     
    mcswiggs likes this.

Share This Page