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Engine rebuild
- 1748 S
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Gary Parsons
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- Thomas Wilcock
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The new roller assemblies that ride on the cam are a self contained unit. The inner needle race is in the unit. The shaft that goes through them to hold them in the rocker arm should be a tight fit so that the roller assembly does not rotate on it.
There would not be room to fit a needle bearing in the rocker arm end that goes on the rocker arm shaft. I don't think the back and forth motion of the rocker arm on the shaft would be a good place for a needle bearing anyway.
Tom
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- 1748 S
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E L wrote: just some clarity. needle rollers are used to replace the original rollers that ride on the cam. bushings ride on the chrome shaft
I recall this discussion earlier this year. I believe I was telling Terry this about his shaft restoration. Another member also mentioned this about hard chromed shafts should not see needle bearings because of the contact area of the needles damaging the hard chrome.
Gary Parsons
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- E L
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- Terry Cockerell
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The guy who did the job pointed out that you cannot uses needle rollers on hard chrome as particles will flake off, but bronze bushes are ok.
T cockerell
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- Thomas Wilcock
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I will probably go for the bronze bushings as well even though I have a set of steel ones. My shafts have been hard chromed.
Tom
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- Thomas Wilcock
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Tom
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- Terry Cockerell
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The lube hole was drilled from outside for production.
If one hole is drilled in the bush the bush can be carefully pushed in to maintain the lube hole alignment. The bush would then be reamed to the finished size.
T cockerell
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- E L
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The lower bushing pushes out easy and the nos steel lined goes in easy as well.
If you use bronze which is an acceptable replacement the OD as well as the ID will have to be sizedThe OD will need to be cut down prior to pressing. If you use the needle roller bearing you will not need to drill the oil hole in the lower bushing. The oil vapor is plenty of lube and will increase oil pressure. Some modification roller pocket is required because the needle roller is wider.
Also the 3/8 hole for the pin will need to be bushed to 5/16. I have the bearings and pins and bronze bearings. This modification has been used for years and is by far the best to date
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Gary Parsons
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- Thomas Wilcock
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(1)I have a set of rocker arms from a supercharged engine. Is there any advantage to using these in my standard engine or would I be best to use the original ones I took out? The supercharged ones appear to be more robust.
(2) The original rocker arm bushings appear to be a thin walled steel shell with babbit lining. The oil hole to feed the rollers must have been drilled after the bushing was pressed in because there is an extra hole at the bottom which serves no purpose except to leak oil. Would it not be best to drill one hole in the bushing before installation and eliminate 16 places for oil to leak out and reduce oil pressure?
(3) I have original new babbit lined bushings with no oil holes drilled. They have to be sized after installation. I am thinking that bronze bushings would be a better way to go. I found that the original ones were impossible to press out. They had to be cut out and seemed to be to be very fragile.
I would appreciate any comments and opinions on this. This is the first Cord engine I have ever rebuilt.
Tom Wilcock
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