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4a. Alternatively, check TDC with.....
(Perhaps add to tools you'll need?)
- You can make a tool for the air line with a piece of pipe brazed to an old plug that has had the porcelean insides removed, a piece of hydraulic hose, and the appropriate air fitting. I suppose you could braze the fitting directly to the plug too, but my plug holes wouldn't allow the air coupling to fit in, and I found the hose convenient.
6a. Thread homebuilt air-line tool into spark plug hole and apply air (90 - 100lb) to pressurize cylinder.
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The are a number of ways to check for TDC, the service manual for 103 engine describes another method too that deals with arrows on the flywheel damper are aligned with the TDC pointer and the cams of the respective cylinder are facing up.
The tool I made is basically the same as yours. I used a K-D 901 for the fitting and a pipe instead of hose.
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Can you give details on your spring compressor?
I assume the piston is raised to TDC and the crankshaft held there so a valve cannot fall into the cylinder? As a practical matter, if you left the pistons down and used 75 lbs or so of pressure, what are the chances you would drop a valve into the cylinder?
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Spring Compressor is K-D 2078
I think piston needs to be at TDC so you can properly pressurize the cylinder, but I'm not sure.
Don't know what would happen if pressurized cylinder and piston is not at TDC.