Quote:
Originally Posted by Tokay444
Run 0w40 and call it good.
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I did and it worked so far, but I’m taking so many other risks I can’t afford to risk something simple like this.
Quote:
Originally Posted by callisto
I don’t have engine assembly experience, but some triage thoughts for you to check if you have not already - once in a while a naive eye can help:
https://www.ft86club.com/files/BRZengine.pdf
This is presumably for at-launch 2013 engines; page EM-120 is where you’re at; your journal diameter measurement is in bounds. There are other measurements recommended, all the way back from EM-107 forward; are they all in scope as well? Especially re: piston diameter and crankshaft tolerances, though this is where I declare inexperience and tap out.
My 2019 service manual has a different/tighter upper tolerance on crankshaft journal diameter (max 68.003) on page IN-15. I didn’t check the other figures (though I see one of the crank shaft bearing thickness limits tightened as well) but duly noted since you’re probably across the facelift boundary.
Chances are, you’re already familiar with all of this, so this is unhelpful; but if somehow it pans out, cheers. |
Yep, 2017+ car so I’m going off a 2017 Toyota manual. The engine looks great after 63 track days and 44k miles with no measurable wear, except this one oil clearance.
Quote:
Originally Posted by Luns
Having never done an oil clearance measurement, I don't know how big a difference this would make, but I would suggest bypassing the gauge pins.
Just zero your bore gauge to wherever your micrometer ends up from measuring the journal OD. Then the bore gauge just reads the oil clearance directly. If I understand your procedure correctly, you're including two more measurements (the two involving gauge pins), and their associated errors, into your final calculation.
One would hope these errors don't overwhelm the actual measurement in which case you'd get the same result, but if the result turns out different - hopefully closer to spec - I'd go with that.
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Thanks. Yeah I asked this on some facebook groups and I got a similar response. I’ll update the original post but it did not make any significant difference. If anything, it confirmed that my measurements were pretty consistent and that some main bearing 3 and 4 are particularly bad.