jrhb,
I set the regulator at about 3 psi for the leak test. Just need enough to blow bubbles at the leaks.

Troubleshooting update.........
 

Tom,

I pulled the complete CIS unit in order to test the engine suction characteristics. See pictures below:

http://forums.pelicanparts.com/uploa...1446591127.jpg

http://forums.pelicanparts.com/uploa...1446591160.jpg

http://forums.pelicanparts.com/uploa...1446591190.jpg

http://forums.pelicanparts.com/uploa...1446591208.jpg

Cylinder #1: pumping air and inflating the balloon.
Cylinder #2: pumping air and going to exhaust.
Cylinder #3: pumping air and going to exhaust.

Cylinder #4: pumping air and partially inflating the balloon.
Cylinder 5#: pumping air and inflating the balloon.
Cylinder #6: pumping air and inflating the balloon.

Note: The crankcase breather was plugged and sure if this has an effect to the test result. Will do another test with the plug removed.

Will go over the cam timing tomorrow. Only cylinders #2 & #3 seem to be normal (?). What other things could contribute to this bizarre engine behavior? What else to check? Thanks.

Tony

Left and right side cams swapped?

That could possibly be the case.........
 

I will be removing the valve covers to inspect the cam shafts. As far a could recall, I had the rabbit ear cam at cam tower 4-5-6 and the 'Mickey Mouse' wide open lobes at cylinders 1-2-3. Or I could easily made a mistake mounting them at the wrong location. Will know soon.

Tony

Tony

With 4/6 cylinders pumping in the wrong direction, I think we have identified why the AFM meter plate does not move and the bypass tubes are filling with fuel.

Something must be very wrong with the cam timing. It seems like both LHS & RHS banks are affected. I would go back and check to see if both valves are closed at TDC for each cylinder much like you would do when setting the valve lash. I suspect the timing has changed from your initial setting.

Woodruff keys?...

You are indeed correct........
 

I was able to spend several hours today to inspect the cam shaft for my notorious newly rebuild engine. I have committed a series of blunders that compounded the identification of root cause of the problem. First, was my mistake in inadvertently switched the cam shafts during installation. Second mistake was erroneously identifying the wider spread lobes cam as the rabbit ear cam. Third mistake was momentarily loss of orientation or direction. I would call this a senior moment which I referred to my left hand as the right side!!!!!

http://forums.pelicanparts.com/uploa...1447457935.jpg

Now that I have identified the problem, time to correct the mistake. I am doing a side by side engine rebuild projects and the other motor is more fortunate to have the correct cam shafts installed. Residual engine oil is being drained in preparation for the removal and re-installation of the cam shafts at the correct locations. So back to cam timing and sprocket alignment this weekend. Like to get this motor running before Thanksgiving Day. Thanks to everyone.

Tony

Good news/bad news, I suppose. At least now you know the cause.

I know what you mean about senior moments. I've always been careful to keep things sorted or in bins so they go back where they belong, but lately I've started marking things so I don't mix them up.

An engine stand, while invaluable, can also lead to getting cylinders on backward, and heads too, on one side, if you always work from one side and just rotate the motor. Easy enough to avoid after doing it once, but not so easy before.

Gives me an idea to check on my "#5 won't fire except with starter fluid" problem - maybe somehow the right side cam could be far enough off that there is not enough suction (well, air pressure depression) during the fill stroke for it, but is just enough for its two neighbors.