Re: Help needed with stuck lifter in my 1929 348
Posted by Owen_Dyneto On 2012/11/5 12:00:54
Here's a cross-sectional engine image from the 33-36 parts manual, pretty much the same for all Senior 6s and 8s from 1923 thru 1939. Can't do much to improve the image quality and I probably have a better one somewhere but I think it's quite self-explanatory as to the design of the valve train.
I suspect you've either lost a roller and pin or bent a rocker arm; damage to the cam itself is less likely unless you continued to run the engine.
It's a bit of a trickly job, but you can remove the set (for 4 cylinders) of the rocker shaft/housing and arms w/o removing the head or removing the cylinder bore casting from the crankcase. It's been perhaps 35 years since I've done this, but from memory -- you'll have to use enough valve spring compressors to elevate each spring where the camshaft lobe isn't in the down position and for those that are you may need to increase the lifter mechanical adjustment clearance and hold them up with closepins, rubber bands or similar. Then with no valve spring pressure on the rocker arms you should be able to remove the entire rocker shaft/arm assembly with judicious wiggling. I suspect you'll find a bent rocker arm or worn roller and pin. Repro rollers and pins are available from Egge and if the arm itself is bent you can probably find a replacement easily enough and if yours are the stamped steel ones (which really aren't a problem, generally) you could consider replacing them all with the later forged arms. I had quite a few of these forged arms but recently sold 24 of them to a gentleman in Norway for the same purpose - but I may have one or two left over if that's of use to you.
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I suspect you've either lost a roller and pin or bent a rocker arm; damage to the cam itself is less likely unless you continued to run the engine.
It's a bit of a trickly job, but you can remove the set (for 4 cylinders) of the rocker shaft/housing and arms w/o removing the head or removing the cylinder bore casting from the crankcase. It's been perhaps 35 years since I've done this, but from memory -- you'll have to use enough valve spring compressors to elevate each spring where the camshaft lobe isn't in the down position and for those that are you may need to increase the lifter mechanical adjustment clearance and hold them up with closepins, rubber bands or similar. Then with no valve spring pressure on the rocker arms you should be able to remove the entire rocker shaft/arm assembly with judicious wiggling. I suspect you'll find a bent rocker arm or worn roller and pin. Repro rollers and pins are available from Egge and if the arm itself is bent you can probably find a replacement easily enough and if yours are the stamped steel ones (which really aren't a problem, generally) you could consider replacing them all with the later forged arms. I had quite a few of these forged arms but recently sold 24 of them to a gentleman in Norway for the same purpose - but I may have one or two left over if that's of use to you.
Attach file:
(153.14 KB)
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