Chev 216 loose piston pin - which one ?

[Mike K]

Been doing some more testing. The valve rockers appear to be running dry, I can hear the noise of rattling valve springs . A peek in through the cap in the rocker cover reveals no oil anywhere . There should be some oil in there surely ?

Maybe the oil line coming up through the block to the rocker shafts is blocked ?

I will have to unscrew the pipe at the shafts and see if any oil comes through .

[cletrac (RIP)]

Rub some soap on a squeaky belt and it will stop squeaking. Liquid soap works too.

[Phil Waterman]

Hi Mike

The noise from the belt has a couple of causes that Ive found:
1. Rust or rust pits on the pulleys
2. Misaligned pulleys, particularly the generator
3. Old belts, they look OK but they get hard
4. Unusual load such as water pump or generator getting hard to turn
5. Belt tension too loose or too tight

If you are ever driving a Chevrolet CMP with the six blade fan and the engine gets quite, pull over you just lost belt.

As to the oil to the rocker assembly remove the cover and run the engine you sold see oil running out every where. Take look at some of the videos on my Web page. Look at the bottom of this page http://canadianmilitarypattern.com/EngineTesting.htm to see example of no oil. If there is no oil getting to the top then check the lifter gallery may be dry or you may find that is where the oil is broken. Take look at https://m.youtube.com/watch?v=bzq0JV...ature=youtu.be 235 engine but same idea.

Cheers Phil

[motto (RIP)]

The rockers don't require a lot of oil so if they are getting any at all it will be enough so long as they are all getting some.
You are probably well aware of it Mike but one of the good things about the old 6 cylinder Chevs is that you can pull out the distributor and run the oil pump with a screwdriver bit in an electric drill for trouble shooting or priming purposes.

David

[Mike K]

Well the oil is dribbling out of the rockers, so the oil flow is working.

[Bob Carriere]

Mike if you suspect that maybe part of the overhead assembly is noisy/dry.... while the engine is running dribble extra oil on the rockers..... one piston at a time .... and listen for noise going away......

Have you tried, while runing the engine, removing one spark plug wire at a time to see if there is a noise difference...... if one piston pin or bottom bearing is loose the noise may lessen if the cylinder is not firing.

Good luck

[Mike K]

Originally Posted by Bob Carriere

Mike if you suspect that maybe part of the overhead assembly is noisy/dry.... while the engine is running dribble extra oil on the rockers..... one piston at a time .... and listen for noise going away......

Have you tried, while runing the engine, removing one spark plug wire at a time to see if there is a noise difference...... if one piston pin or bottom bearing is loose the noise may lessen if the cylinder is not firing.

Good luck

Hi Bob

When I had this motor apart I had the valve seats done by a guy in town, he said to me , "the valve guides are rather worn, I can install new guides for $60" . I didn't get the guides done well the noisy valves are now evident , the valve stems wander around in the guides . Yes I was going to pour some oil on the whole rocker assembly while the engine was running and listen .

BTW its the original motor , still standard bore with the original pistons. The motor actually runs smoothly just a little noisy . I am tempted to remove the head and do the valve guides .