K-jet injectors and timing marks on '81 240

Discussion in 'Volvo 240' started by Todd F. Carney, Nov 3, 2003.

  1. Folks,

    I'm the proud new owner of a 1981 240 wagon. It has only 111K miles
    and it's in really good shape. I'm the third owner (the first two
    were father and son). The car sat for perhaps a year before I bought
    it. The main fuel pump was frozen up, and I've had to replace the
    water pump and a few other minor items.

    My real problem has to do with a very rough idle (rougher when cold)
    and perhaps hard starting when warm. I've put injector cleaner in the
    gas, but I've put only 20 miles on it since (to drive it home after
    taking possession). Among other things I'm in the process of checking
    out, I've noticed that I can wiggle the injectors quite a bit. They
    don't flop about, but at their ends they may move between 1/16th and
    1/8th inch in any direction. My question is: should they move this
    much? The LH injectors on my '84 don't move at all (since they are
    captured by the fuel rail). Do I need to replace the seals on the
    K-jet injectors? If I do this, I also presume I should observe their
    spray patterns while they are out.

    My second significant problem has to do with an apparent lack of a
    timing mark on the belt pulley. I found no notch or marks of any kind
    when I had the fan off while installing the new water pump.
    Consequently, while I had the timing belt cover off, I hand cranked
    the main shaft such that the cam and intermediate sprockets were
    aligned to TDC (as marked in white on the sprockets). Where the main
    pulley fell at the index cast into the front seal housing, I filed a
    shallow notch in the shieve that would be closest to the timing marks
    cast into the timing belt cover.

    After I reinstalled the timing belt cover, I was surprised to find the
    notch at the 20 degree mark. Now that I've had a timing light on it
    and found the notch at about the five o'clock position, I wonder
    whether or not I actually notched the shieve at the right place. Any
    thoughts?

    Many thanks for your help!

    Todd Carney
    Ashland, Oregon
     
    Todd F. Carney, Nov 3, 2003
    #1
  2. Todd F. Carney

    Steve Rogers Guest

    Whilst the engine is idling, spray the indector bodies down near where
    they mate into their holders with WD40. This will temporarily seal the
    injectors from sucking air if the seals are leaking (or it will add more
    fuel to compensate for the more air), I'm not sure which.

    If the idle improves and smoothes out, then you need to replace the
    injector seals--really cheap to do. Injector cleaner should clean up the
    spray patterns eventually. Use only pure Techron, not anything with
    some Techron in it for cleaning the injectors.

    Be very careful with high pressure fuel spraying from injectors lest you
    burn up your new Volvo.
     
    Steve Rogers, Nov 3, 2003
    #2
  3. Todd F. Carney

    volvowrench Guest

    If you inspect the sheaves for the crank pulley you will notice that the
    center mounting hole has a notch. On the crank sprocket face there is a
    dowel pin that matches the notch. If when the sheaves are removed, to
    adjust the spacers for example, and they are reinstalled without regard
    to the notch, tightening the four bolts and two nuts will simply push the
    dowel pin into the flange and leave the timing mark on the sheaves in any
    of five incorrect places or one correct place.

    Bob
     
    volvowrench, Nov 4, 2003
    #3
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.