Tweak­ing the valves

Canal Boat - - Back Cabin: - TONY REPLIES… JOHN BOGGIS, via the CB

QMy Isuzu 42 4LC1 en­gine has reached the 1,000 hours rec­om­mended for check­ing and ad­just­ing the valve clear­ances. I have been told the rocker box cover has a rub­ber gas­ket. Is this true or does it re­quire a new cork or paper gas­ket? Is there a work­shop man­ual avail­able for this en­gine?


For the man­ual look at winco­ down­loads/win­co_engine_­main­te­nance/isuzu_4le1_opm.pdf or chat to a hire fleet op­er­a­tor or Isuzu in­dus­trial/agri­cul­tural en­gine dealer. The man­ual will al­most cer­tainly be for the base en­gine, not the marine ver­sion. Al­most all mod­ern en­gines use a rub­ber gas­ket.

Ad­just­ing the valve clear­ances once you know the clear­ance is sim­ple. Turn the en­gine over un­til one valve is fully down. Mark the en­gine pul­ley (the low­est one). Use the mark to al­low you to turn the en­gine over one full turn (give or take an inch or so). Ad­just that valve. Rub out the mark and start again with an­other valve. This will work on any en­gine with any num­ber of cylin­ders and any valve ar­range­ment.

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