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super a engine questions

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werowance

01-19-2006 07:36:54




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i am going to put new mains and rod bearings.

the bearings are stamped on the back with 002 both rod and mains. is this a standard size bearing or over sized? my machine shop says standard after measuring them, but i dont trust them 100%.

also i would like to know what the oil tolerance on the rods and mains, so i can plastigage after instilation.

what are the torque specs on rods and mains.

and on the oil pump, the pickup tube swivels, i think by design. but shouldnt there be a o ring in the swivel part? or not.

thanks

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chip man

01-19-2006 15:08:15




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 Re: super a engine questions in reply to werowance, 01-19-2006 07:36:54  
I noticed that no one had answered you about the oil pickup. Yes there is supposed to be an o-ring in there.



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werowance

01-21-2006 07:51:08




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 Re: super a engine questions in reply to chip man, 01-19-2006 15:08:15  
ok, theres an oring thanks, im trying to find it in my parts book but i cant, do you have a number for it, and just to make sure, it goes on the oil pickup tube and then inserts with the tube into the oilpump body? since mine didnt have one on it when i took it out (engine has been apart before by previous owner) im not sure where and what to put back on it.

thanks



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El Toro

01-19-2006 09:16:49




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 Re: super a engine questions in reply to werowance, 01-19-2006 07:36:54  
I would find another auto machine shop. One that doesn't know the difference between std bearings and .002" undersize I would stay away from.

You should take the crankshaft to a reputable
auto machine shop and have it measured. Probably needs at least a polishing. They can supply new bearings too.

Rod torque is 40-45 ft-lbs with nuts using cotter pins and 43-49 ft-lbs with self-locking nuts.
Mains require 75 ft-lbs. I would use a bearing clearance of .001"-.0015". Hal

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Janicholson

01-19-2006 08:53:37




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 Re: super a engine questions in reply to werowance, 01-19-2006 07:36:54  
They are undersized bearings .002 on the shell is how much they are smaller in I.D. than original. Putting standard bearings in the engine will be wrong. Measure the crank journals (rods and mains)in 4 or more directions across diameter, and across width of journal with a micrometer that is calibrated to within .0005".
The size of the journal drives the selection of bearing shell. All ground/polished cranks are undersize from stock unless welded up and reground.
JimN

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captaink

01-19-2006 09:18:44




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 Re: super a engine questions in reply to Janicholson, 01-19-2006 08:53:37  
I can’t emphasize measuring crankshafts enough. I took my dad’s M apart and it had 0.003 bearings in it. I measured the crank and it measured 0.002 undersize. He insisted (used to be a mechanic himself) that a crankshaft never gets bigger, so put 0.003 bearings back in. (You know how that is, kids don’t know anything :>) ! ) Well, turned out that that the 0.003s were too tight but having a stubborn German streak in him, he insisted on leaving them in. Well, not too many hours later, the bearings started disintegrating and coming out with the oil. Cost me an early overhaul and a crank grind.

One lesson I learned was to always measure a crankshaft before ordering bearings. The other was to listen to the young bucks! Don’t just assume that they don’t know what they are doing, but check their work to make sure before you assume (ahh…you know what the word stands for). :>) (BTW I do try to listen to my young sons, many times they are not quite 100% right, but usually they are thinking and on the right track.)

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