Motor assembly question

John Seybold · Aug 22, 2014

Hi,

I took my 67 CMB apart and have a question about putting it back together. On the back of the drum which hole goes to the crankshaft pin? One hole is is all the way through to other is not.

Thanks

Buckshot · Aug 22, 2014

A simple way to tell if the drum (or even a disk) is in correctly is when the piston is at TDC the drum (or disk) should be open.

Note-If checking this way on a disk motor be aware that if the disk is in backwards it will still be open at TDC but the timings will be off.

Danny King · Aug 22, 2014

Or...if the motor is a BDC the disc or drum is closed.

John Seybold · Aug 22, 2014

Thanks guys

Roy Munoz · Aug 22, 2014

Put it in the hole that all of the way through it...

Buckshot · Aug 23, 2014

Danny King said:
Or...if the motor is a BDC the disc or drum is closed.

Um, yeah that too.....I love the internet.

Bruce Clark · Aug 23, 2014

I like to think when the piston is starting to go up it will suck fuel in and when the piston is going down the valve or drum will be closed to force fuel to the top of the piston to be used. Just another way of understanding what happens in the engine.

FloridaScaleBoater · Aug 23, 2014

Bruce Clark said:
I like to think when the piston is starting to go up it will suck fuel in and when the piston is going down the valve or drum will be closed to force fuel to the top of the piston to be used. Just another way of understanding what happens in the engine.

Yup,,, thats the way I try to discribe the process

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