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Re: A15 cam bearings
Quite a regular
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2002/10/19 10:41
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Sorry I thought it was the front bearing that was scored. Agree with what lamb_daiquiri said - easy way to check is get a straight edge or ruler and place it on the journals - all the lobes should clear the straight edge. If not the lobes will score the bearings as you slide the cam down the cam tunnel. A bent cam would do this too but you would have issues getting it in and out if it were that bent. No doubt this damage was caused by a person and not the engine during running.

Posted on: 2/12 23:00
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Re: A15 cam bearings
Just can't stay away
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2015/11/10 17:48
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I agree that the previous owner caused the damage. I disassembled the engine some time ago and carefully removed everything. I don't recall putting any kind of force on the camshaft when I pulled it out. The engine must of been rebuilt at some point which is when this happened? I received my Clevite bearings this weekend and taking them along with the block and cam to the machine shop. Will post when it's done.

I have another question related to crankshaft end play. It measured .003 in. while I was keeping leverage on the crankshaft which is a little tight. Haynes manual calls out .002 thru .006. Should I have my machine shop shave some of the thrust bearing or crankshaft, or just leave it as is?

Posted on: 2/13 3:19
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Re: A15 cam bearings
Not too shy to talk
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2016/7/22 12:39
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If you relieve the leverage on the crankshaft and then measure it, does it keep the .003 in. gap? If it does I'd leave it; it's not right on the edge but close to it. Better than that too loose.

Posted on: 2/14 2:45
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Re: A15 cam bearings
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Quote:
crankshaft end play. It measured .003 in... Haynes manual calls out .002 thru .006
That's right in between the Haynes specs. I'd leave it be

Nissan spec is: 0.0020 to 0.0059 inch. Again .003 is between these figures

Posted on: 2/14 3:01
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Re: A15 cam bearings
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Ok, got my block back with new cam bearings. Camshaft slid in there no problem and spun freely. My only concern is that he didn't line up 3 of the oil passageways 100%. And the outer bearing shows 2 oil passages but only one is lined up with a passageway hole. He said the block only had 1 oil passageway. Someone please tell me that is correct. And should I be concerned with several bearings not being lined up with the oil passageways?

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jpg  cam.bearing1.jpg (136.16 KB)
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jpg  cam.bearing2.jpg (135.63 KB)
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jpg  cam.bearing3.jpg (104.34 KB)
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jpg  cam.bearing4.jpg (123.41 KB)
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jpg  cam.bearing5.jpg (111.40 KB)
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jpg  oil.passage1.jpg (31.09 KB)
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jpg  oil.passage2.jpg (114.32 KB)
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jpg  oil.passage3.jpg (105.48 KB)
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jpg  oil.passage4.jpg (122.64 KB)
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jpg  oil.passage5.jpg (98.46 KB)
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Posted on: 2/16 3:19
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Re: A15 cam bearings
Not too shy to talk
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2016/7/22 12:39
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Well. The word dodgy is the first to come to mind. I'm not sure how bad a partial line up is but one that's completely off would be like running a gearbox without oil right?

Posted on: 2/16 23:50
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