Taffel, Sherman wrote:
> When doing the compression check on the airplane, we find TDC by placing
> one's thumb onto the spark plug threads orifice and slowly turning the
> propellor in the proper direction, determine TDC. Compression will blow off
> your finger unless one starts very close to TDC, then one's can feel the
> skin of one's thumb being 'sucked in' when past TDC.
>
> I've been able to do this on the TR4 and can just barely get my thumb onto
> the LOTUS 907 orifice, so I understand the the 'attempt at using a plastic
> clothes hanger. However, I also understand one can not easily turn the crank
> as the later J-H's have viscous fans and no direct metal fan blade. Still
> seems that without plugs, one would be able to turn the crank pulley with
> both hands.
>
> Isn't the crank bolt useable?, or does the bolt for the crank pulley use
> reverse threads? And what aboput using a tiny MAG light to 'see' the top of
> the piston - I have done this in the past as well on engines?
>
> I ask this as I am about to dissemble my 907 in the next month! I would
> never use the starter as its not 'sensitive' enough and can even 'whirl'
> the engine with a very instantly on-off key.
>
If you are going to disassmeble the engine, why don't you just do it
when the head is off? Mount a dial indicator above the #1 piston and
just note when the piston top is at its highest on the dial indicator's
gauge. It may also be possible, if you don't remove the head, to put
the arm of the indicator in the piston hole, but I haven't done that, so
I don't know. I did mine with the head off and found TDC to be exactly
where the indicator marks said it was.
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