Why should a piston start to hit a valve?
I suppose if it started to stick after the engine had been running.
(The indication seems to be that on startup there is no misfire or knock)
Had a mysterious misfire on a Detroit Diesel V engine.
All static checks OK. On stripdown it transpired that a fuel leak from a injector pipe (within the engine casing) had diluted the lubricating oil and subsequently caused wear of a roller-follower that operated the injector. Thus the injector-timing was wrong as the injector was late (due to the increased clearance caused by the flat on the roller-follower) causing the engine to misfire. In addition, the engine sump oil level continued to
rise . . .
Checking the injector clearance statically gave the correct value as the roller-follower rotated onto the high point.
I'm
not suggesting that the Routemaster has the same fault BTW.
Is it in fact an AEC engine, or is it a
Leyland engine?
Or is it perhaps an Iveco or Cummins engine?
Quote:
Originally Posted by billyboy
needs the head off to check the piston is not hitting the valve. Check the fuel injection system first though
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Quote:
Originally Posted by billyboy
needs the head off to check the piston is not hitting the valve. Check the fuel injection system first though
|