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Old 02-09-2014, 10:21 AM   #1
tcpip4lyfe
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Default Thrust Bearing way too tight. What do?

I'm putting together an EJ20. Crank has been ground 10-10 and I ordered .25 oversized king bearings. Everything has been spot on clearance wise so far except for the thrust bearing sidewall clearance. When I drop in the crank and torque down the case, the crank won't even move because the thrust bearing is right up against the back of the crank with 0 clearance.

What do?
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Old 02-09-2014, 10:35 AM   #2
DisoDisp
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By oversize I assume you mean +0.025mm
Get looser bearings.

You may need to mix and match to get proper clearances.
Eg 1 shell .std and one 0.025mm oversize
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Old 02-09-2014, 10:36 AM   #3
sidewayz
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1000g sand paper, spray wd40 on the paper and figure 8 the thrust bearing on the paper lightly.
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Old 02-09-2014, 10:37 AM   #4
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Quote:
Originally Posted by sidewayz View Post
1000g sand paper, spray wd40 on the paper and figure 8 the thrust bearing on the paper lightly.
Just on the crank side I assume?
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Old 02-09-2014, 10:39 AM   #5
sidewayz
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Both sides are crank side. Google thrust bearing sanding
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Old 02-09-2014, 10:46 AM   #6
tcpip4lyfe
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I guess the halves that are against the crank would have been a better description. Not the halves that are against the main seal.
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Old 02-09-2014, 11:10 AM   #7
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I think most Subaru undersize main brgs have an oversize thrust, .1mm if I remember but not sure on that. The crank needs to be ground there also if this is the case with your bearings. Sand the brgs? No, have the crank properly sized. It's a pita to grind thrust surfaces oversize, but not too bad on a Suby because they are steel cranks and the surface area is pretty small. I've ground cranks for 30 plus years so am familiar with the process.
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Old 02-10-2014, 04:30 PM   #8
Barney145
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I checked my bearing catalog, the .25mm undersize main does have a .1mm (.004") oversize thrust. Depending on if you have a center or rear thrust location, standard width of the center main brg is .864", rear main .904". If yours measure approximately .004" wider than whichever one of these you have, you need to have the crank ground to match. It's also best to measure the width of the thrust as it is installed in the case, sometimes the block will expand them slightly and change the measurement.
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Old 03-05-2014, 08:05 AM   #9
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Quote:
Originally Posted by Barney145 View Post
I checked my bearing catalog, the .25mm undersize main does have a .1mm (.004") oversize thrust. Depending on if you have a center or rear thrust location, standard width of the center main brg is .864", rear main .904". If yours measure approximately .004" wider than whichever one of these you have, you need to have the crank ground to match. It's also best to measure the width of the thrust as it is installed in the case, sometimes the block will expand them slightly and change the measurement.
You were right on this. Over sized king bearings have a +.1mm thrust surface. Crank should have been ground to match. Live and learn. I got fed up with going round and round with the machine shop so I just ended up getting a new crank and bearings. Exactly what I should have done in the first place.
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Old 03-05-2014, 08:50 AM   #10
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See, sometimes old guys know what they're talking about. What were we talking about again??
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Old 03-05-2014, 06:05 PM   #11
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Barney why do you say not to sand thrust bearings? I know a lot of old timers do it to get end play right.
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Old 03-05-2014, 06:12 PM   #12
fastblueufo
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Im 46 and I have sanded plenty of thrust. Have you ever measured clearance all the way around the thrust? Its far from equal.
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Old 03-05-2014, 06:38 PM   #13
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Engines with separate thrust washers can be surface ground (or sanded if you don't care about accuracy) on the backside of the bearing to increase clearance. I've done that for years but I'm not machining the actual bearing surface. If there is a lack of thrust clearance there is probably a cap alignment issue or the bearing is oversize and the crank needs to be ground to match. Sanding on a thrust will get you clearance, but the surface will not be square with the crank and you'll probably have a point loading situation. Of course this is in reality not a problem as a thrust does not have any constant load on it in the first place, that's why it is not a critical clearance. Most engines require a minimum of .002" to a max of .006" and they routinely have more than that without a problem.
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