HELP! Having difficulty seperating the valve head from the cylinder head.

[LuckyPapa]

HELP!!!
I'm having difficulties disassembling the engine of my 1980 Honda cb750.
I've beaten it with a 2 Lb. dead blow hammer for hours. I have checked and re-checked that there are no other fasteners still in place. I tried stuffing a couple cylinders with rope and try to bring those cylinders to top dead position. I'm too old to muscle things off any more.

 

[Loose Chain]

Be careful you don't bend any valves doing that, but you probably have the cams out so that wouldn't apply.

 

[brettp]

I've never been in that position, but can you use heat to separate them without distorting the metal?

 

[Loose Chain]

I've used air before but not on a CB. You can get fittings that thread into the sparkplug holes and then make yourself a manifold with 1 airline in from your compressor and 4 lines out connected to the cylinders. With the cams out all the valves will be closed so you are getting shop air pressure (90-120 lbs) in each cylinder. Then use your dead blow hammer to tap on it. Put some of the nuts back on by a few threads to catch it when it comes loose. If you didn't have air you could also use hydraulics in the cylinders.

 

[LuckyPapa]

great replies! thanks guys.

 

[LuckyPapa]

I sound like Dr. Susse.

 

[Loose Chain]

Sam I Am