Notes from Dr. Borkosky

Undersized bearings compensate for the amount of material removed during this machining process. The oversize or undersize is measure on the crank, not the bearing. The caps are numbered and usually have an arrow pointing toward the front of the engine. Again not sure about Subaru but some manufacturers use a finishing process on the crank journals called nitriding. I've never seen a bearing company use LESS surface material to accommodate sizing....unless it's an HX.. $zopim.livechat.window.setTitle('CMN Supportchat'); In technical ASE explanation that was probably written in 1965 then yes, yes you are correct. To restore the journals to stock smoothness, machinists remove just enough material from the journal surface to eliminate the deepest scratches. _.push(o)};z._=[];z.set._=[];$.async=!0;$.setAttribute("charset","utf-8"); This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.



When you order bearings you can get oversize or undersize. Add 0.10-inch of thickness to the inside to create an undersized bearing and you've still got 3 inches on the outside but 2.30 inches on the inside.

dont get fooled buying bearings from places such as ebay. If you line hone a block but have stock crank journals you use oversize bearings. if(req) { Journal scoring or scratching as a result of oil contamination is common. You'll likely get away with just the new standard bearings for a while but if the old ones were worn,the crank is likely to be ovalled if not marked. } Assume your new bearings were standard and therefore if they're too tight,the shaft has been ground before.Think you really to to consider another regrind to do the job right as if there are damaged bearings,the shaft will be in need of attention too. What is that supposed to mean? Oversized bearings will not help with oil, if anything I would think it would hurt as the circumference of the bearing surface is technically smaller. Std,.025,.25,.50 Cut crank that measures .25 out of spec? $zopim.livechat.concierge.setName('Holger');

An oversized bearing has the same inside diameter but a bit more material on the outside diameter. $zopim(function() { Paul,the number 31126311 is a Perkins part number and the bearings are standard.Note the Perkins symbol beside the number.They will have sent you undersized bearings ie thicker metal on the inside face,hence the tightness. $.src="https://v2.zopim.com/?5Ne1CKtzJBfhzEQcQqhehuEFyH8uqe0v";z.t=+new Date;$. Strange there are no sizes on the old bearings? } Bearings can and do spin in the block sometimes, but more often than not, oversized bearings find use in blocks that have been line-bored. type="text/javascript";e.parentNode.insertBefore($,e)})(document,"script"); I just replaced all the rod bearings in my car but I noticed cylinder #1 had a little movement. I see 4 available bearings. If you stuff a .50 bearing in a stock journal thinking you getting extra oil clearance you are in for a world of hurt. Join Yahoo Answers and get 100 points today. So if you have a crank ground you use undersize bearings. Im not being hard headed Im just trying to tilt your heading in a slightly different direction of thinking... we aren't dealing with SBC or BBC or SBF..... these are Subarus where just like you said cutting mains isn't common. Oversized bearings compensate for the amount of material removed during the machining process. You are saying the opposite which is not the case. loadXMLDoc('?a=' + id); Crankshaft journals bear the brunt of your engine's horsepower assault and are subject to all sorts of damage and wear. As I stated undersize and oversize are as follows. color: #FFFFFF; These particles indicate that two metal parts are in contact with each other creating metal shavings.

else if(window.ActiveXObject) { The oversize or undersize is measure on the crank, not the bearing. What are some mods i can do to make a suv handle a little better? I shouldnt have referenced the hx as oversize above but technically it is oversized when measured to the crank journal. Used when line boring of the conrods or main bearing journals has been done.

I measured it with a plasigauge and sure enough, it has been worn out of spec. Thanks for the replies. req = new ActiveXObject("Microsoft.XMLHTTP"); If the engine's main bearing bores measure 2.650 and the crank journals measure 2.450, you could have the main bores machined to 2.64 and the crank to 2.45; that would allow you to utilize the cheap and readily available small-block Chevy main bearing for initial assembly and any future rebuilds.

The size is stamped on the back on the insert. }  I absolutely recommend finding one for your year and reading through the procedure.

Find and repair this problem before proceeding. Which would give you more clearance on a stock journal.

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