Posted by Mark. C
on 12/4/2009, 8:37 pm, in reply to "Re: Pete Finn"
91.108.85.93
Go back to basics and start with a compression test, if your valves are not closing due to bad shimming or damage this will identify lack of compression either through your valves or if not them the rings. If you set each cylinder at TDC on the compression stroke when both valves should be closed, then pass air through the spark plug arpeture if they are not closed air will come through your exhaust or the air intakes, if your rings are knackered it will come out of your sump, this is going back to my days as a diesel fitter, only problem is getting an air supply. Dependant on your knowledge of engines you can work to what I would call the rule of seven due to six cylinders being the medium in this engine, when your cams are rocking on as an example number 5, take 5 from 7 and that means numer 2 cylinder valves are shut 3 from 7 number 4 are shut. This will then direct you to the cylinder you need to test, you can then follow the normal firing order.
If I have totally confused you, Pete F may be able to enlighten you or feel free to call me on 07825 710578
--Previous Message--
: Jeff,
:
: Sounds like your CAMCHAIN TENSIONER has
: failed and allowed the camchain to jump the
: cam sprockets......allowing your valve
: timing to go all to hell, or someone did not
: put the cams back into the head correctly.
:
: You will need to find 6 replacement
: valves....I suggest new.....and grind them
: into the existing seats.
:
: I would then definitly buy a ZZR1100
: Camchain Tensioner before rebuilding and use
: that.
:
: The only other damage you could have done is
: to the CROWN of your pistons. Look at all of
: these with a magnifying glass for holes or
: scars, as these will get white hot when
: running and cause a siezure. The piston
: crowns must be very smooth and undamaged.
: Depending on the speed you were doing when
: the damage occured, you may have damaged a
: small end or bent a conrod. The only way to
: check this is visibly, so it would mean
: cylinder block removal too.
:
: Also check the area where the valves
: contacted the heads surface itself, as if
: thats scarred, you need a replacement head.
:
: Hope that helps ?
:
: Pete F
: Up North
:
:
:
: --Previous Message--
: Hi Pete, took head off a z1300 engine as it
: was reading 0 comp on all 6, found all 6 ex
: valves & 1 in valve sticking, what cause
: this & how do i sort it, should i be
: looking at anything else. regards Jeff
:
:
:
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