Re: 56J Motor, Recent Work & Lessons Learned
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Home away from home
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Long story short, I figured out 14 of the 16 pushrod sockets in the rockers were shot. Interesting failure mode. I don't believe I've ever heard of that before. I wonder: what caused the pushrod seats in the rocker arms to fail? Inadequate rocker arm oiling? IIRC, the pushrods in a Packard V-8 are hollow but don't have holes in the ends like in most other engines, so the oil on the rocker arm end of the pushrod has to come from the rocker, not the lifter. Usually, there's enough oil flying around under the valve covers that EVERYTHING gets oiled, but in this case apparently not. Craig
Posted on: 2013/12/1 16:39
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Nuke them from orbit, it's the only way to be sure! Ellen Ripley "Aliens"
Time flies like an arrow. Frui |
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Re: 56J Motor, Recent Work & Lessons Learned
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Will try to upload a pic of one of the rockers.
Posted on: 2013/12/1 17:50
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Re: 56J Motor, Recent Work & Lessons Learned
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Hey JoeH
I think we are neighbors. You get bored and need another 352 to work on mine is out of the car for the next couple years as the rest of the work is being done. Just saying....
Posted on: 2013/12/1 18:03
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Stewart Ballard
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Re: 56J Motor, Recent Work & Lessons Learned
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The way I figured it out was: with engine off, used finger & thumb to rotate each pushrod. I noticed the ones that hardly rotated had considerable more drag than the ones that spun like tops. Then, removed and disassembled the rocker sets, and visually inspected each socket. Next, with all parts clean and dry, rotated a pushrod in each socket, while holding it up to my ear. I could hear and feel the drag on the sockets that were wore out, and could hear/feel nothing on the others. Further, on the worst ones, if the pushrod was shifted side to side while in the socket, it produced noticeable clicks, more felt than heard.
I attribute the above problems to simple wear & tear. After all, this motor has around 235,000 miles on it. The system design, that affords minimal oil to the top end also likely did not help. But big-4 stuff also fails, sometimes sooner than later. Have had the Olds pump on this motor now for around 15,000 miles, and it oils the top end much better.
Posted on: 2013/12/1 18:06
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Re: 56J Motor, Recent Work & Lessons Learned
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Hi Stewart,
I agree, we are neighbors. Will definitely have to get together sometime. I could drive the 56J over your way sometime. Not interested in doing anymore 352 work for awhile though :)
Posted on: 2013/12/1 18:14
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Re: 56J Motor, Recent Work & Lessons Learned
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JoeH
I understand, I really do. This is my first Packard engine. I knew you were out there as I saw some earlier post discussing your Olds oil pump. I am planning to do the same so I may pick your brain when that time comes.
Posted on: 2013/12/1 19:34
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Stewart Ballard
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Re: 56J Motor, Recent Work & Lessons Learned
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That's good info, Joe. I never bothered to check rocker sockets. However, you may be driving the highest mileage Packard V8 ever. Probably no one ever was able to wear out the rocker sockets before.
It must have been a problem for those transmissions which would run enough miles, because while Packard, Mopar and AMC used 1/4" pushrod ball ends during the '50s. The result was too much point loading and resultant wear. Mopar and AMC went to 5/16" pushrod balls in early '60s. jack vines
Posted on: 2013/12/1 20:51
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