Re: '55 engine back to life! Mostly worked...
Posted by HH56 On 2018/8/12 20:21:13
Quote:
The revised cam thrust plate actually does the opposite. In the original design oil was able to squirt in a more or less continuous stream into the timing chain area to lube the chain and gears. That caused a pressure drop in the lifter gallery and was identified as another cause of occasionally noisy lifters. In the revised plate the oil was restricted to one squirt at a specific point per cam revolution. In my opinion if you have new bearings and the Olds high volume oil pump that is providing an adequate increased pressure and volume there is not a lot of reason to change the plate.
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Since I got this think mostly apart, I see that Jack has an updated cam retainer plate for sale. My understanding is that the mod allows more oil to flow past it. With the Old high volume mod (and no paper towel...) would that plate still be worthwhile? Again, there seems to be plenty of oil everywhere in this engine.
The revised cam thrust plate actually does the opposite. In the original design oil was able to squirt in a more or less continuous stream into the timing chain area to lube the chain and gears. That caused a pressure drop in the lifter gallery and was identified as another cause of occasionally noisy lifters. In the revised plate the oil was restricted to one squirt at a specific point per cam revolution. In my opinion if you have new bearings and the Olds high volume oil pump that is providing an adequate increased pressure and volume there is not a lot of reason to change the plate.
Attach file:
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