Quote:
Originally Posted by Diesel911
I still do not get part or the 2mm Method.
Since the Dial Indicator was set at Zero I am not getting how this happens: "Dial Gauge has gone back by 2mm (valve lift) to 1mm.
I will likely have to read someoned DIY to understand it.
In the Offset Key Selection Chart it looka like if you did the Camshaft Alignment you could use that to select an Offset Key. However, the camshaft Alignment is not a precision as the 2mm Method.
And, then there is the Chart on the first page of the PDF. It has a New Chain and used chain if I remember with 20,000 miles on it specs. I don't recall the instructions saying which of the 2 to use to selecte the offset Key.
People have suggested that the 20,000 Miles is sort of the expected stretch; sort of a break in stretch that was calculated on at the Factory. So you would think that if you were installing a Offset woodruff Key on an Used Chain you would use the Used Chain you would use the Used Chain specs.
So for Me there is a few unknowns.
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The procedure is this
You turn the crank until the cam lobe on the intake valve (2nd one in!) over #1 cylinder is pointing upwards
This means two things
a) the valve is closed
b) you are close to the TDC before the intake stroke
The clearance between the rocker arm and the cap on the valve stem needs to be removed. So you set the valve clearance to zero - if you like no feeler gauge fits.
You now set up your DTI (clock gauge) by putting the probe on the valve spring retainer
You push the DTI downwards so that you have a 3mm pre-load.
You need this pre-load because although this method is called the 2mm "lift" method - the valve will drop downwards into the cylinder {but the valve "lifts" from the valve seat}
If you don't have any pre-load, the needle on the DTI stays in the same position
With the 3mm pre-load set you continue to rotate the crank in its normal direction of rotation until the DTI shows a drop of 2mm - so it will be reading 1mm
This is the point at which you read off the graduations at the crank
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Please note this is NOT the elongation
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You now have to find the camshaft code on the back of the camshaft (near to cylinder #5) and compare the measurement you have made with the data in the FSM