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Josh(NE) 
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Joined: 12 Sep 2009
Location: Nebraska
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 Topic: 2900 block question
Posted: 22 Jun 2015 at 10:13am |
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Stopped at local mechanics shop and he is doing an OH on a 190XT. He pointed out that on this 2900 block there is no oil hole for the rear cam bearing to line up with. Are they all that way or this block a fluke?
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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake
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DrAllis
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Joined: 12 Sep 2009
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Posted: 22 Jun 2015 at 11:08am |
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That is the way they are. Tell him to not even try to figure out how it works.
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Josh(NE)
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Posted: 22 Jun 2015 at 11:41am |
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So is it normal to have that bearing fail long before the other cam bearings. This thing had plenty of hours on it, but that bearing looked horrible.
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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake
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DrAllis
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Posted: 22 Jun 2015 at 12:08pm |
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No. The front usually looks the worst.
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Hurst
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Posted: 23 Jun 2015 at 10:22pm |
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I was once told they are oiled by magic lol! But I bet what doc said is true if you look at the old bearings. Also, put the new ones in the freezer until right before you install them. Makes it way easier to press them in.
Hurst
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1979 Allis Chalmers 7000
5800 Hours
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tbran
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Location: Paris Tn
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Posted: 23 Jun 2015 at 10:56pm |
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once overhauled a 2900 out of a cat scan gen power unit. 12000 hours. The cam lobes were almost flat, lifters were cupped unreal, cam brgs were almost perfect - except front was showing bronze, as stated, magic,,, don't screw with perfection....
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When told "it's not the money,it's the principle", remember, it's always the money..
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cranky
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Joined: 08 Jan 2012
Location: easton md
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Posted: 24 Jun 2015 at 7:51am |
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cam bearings rely on oil draining back from rockers to lube bearing journals.it is not pressure fed lube
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