bittenfleax

UPDATE! So I've double checked my measurements with plastigauge to be on the safe side. The readings I got on the plastigauge were matching up perfectly with my measurements! Below is a picture of the 1st lobe for clarification. I've also installed piston 1 - I checked the ring gaps (using TP rings) - they were in tolerance. I also checked the tolerance with plastigauge and the reading I got was the same as my measurements! 3 more to go now

That sorted it - I measured the bearings at the centre point using the ball bearing supplied with my micrometre and also re-measured the lobes as it was the first set I measured (so was more likely to be inaccurate) If anyone comes across this and is stick - I got the following after measuring the bearings properly: Location Lobe Size Gauge Tolerance Total Lobe U Shell L Shell Bore Tolerance STD Min STD Max Max Tol Main 1 21.988 25 46.998 1.993 1.991 51.038 0.056 0.016 0.048 0.08 Main 2 21.989 25 47.000 1.992 1.993 51.049 0.064 0.016 0.048 0.08 Main 3 21.988 25 46.997 1.992 1.991 51.030 0.050 0.016 0.048 0.08 Main 4 21.988 25 46.997 1.994 1.991 51.046 0.064 0.016 0.048 0.08 Main 5 21.992 25 47.002 1.992 1.991 51.046 0.061 0.016 0.048 0.08 Thank you @Claymore for pointing me in the right direction!

Oh yeah, so that's what the ball is for in the micrometre set 😆😅 I will do your method tonight and review the results cheers man! I did install all the caps (torqued down as well), I just measured without the bearings to get the initial bore size. Then I just add the thickness of the bearings onto this. I then subtract this result from the lobe of the crank which gives me my tolerance - means I'm not scratching the surfaces of my bearings with a telescoping gauge!

Hi guys, I've measured the tolerances for my bearings and I have got the following values (I re-measured everything 7-10 times to make sure they're correct) Location Lobe Upper Shell Lower Shell Bore Tolerance STD Min STD Max Max Tol Main 1 46.988 1.956 1.961 51.038 0.133 0.016 0.048 0.8 Main 2 46.988 1.964 1.961 51.049 0.136 0.016 0.048 0.8 Main 3 46.987 1.958 1.957 51.030 0.128 0.016 0.048 0.8 Main 4 46.986 1.963 1.964 51.046 0.133 0.016 0.048 0.8 Main 5 46.992 1.950 1.957 51.046 0.147 0.016 0.048 0.8 As you can see my tolerances are out by about 0.5mm. I am using Standard Taiho bearings purchased from Japserviceparts.com. Looking at the specs for bearings, my shell sizes should be as followed: STD mark 1 = 1.995-1.999mmSTD mark 2 = 1.999-2.003mmSTD mark 3 = 2.003-2.007mmSTD mark 4 = 2.007-2.011mmSTD mark 5 = 2.011-2.015mm Mine are about 0.05 too small by the looks of it - Looking at the spec sheet on Taiho's website (http://www.taihonet.co.jp/e/ebc/all.pdf) - the bearings I have got (Model T025A) are listed for the EP82 and EP85. My understanding these had 4E-FTE's as well - so this shouldn't be an issue? If I were to get some OEM bearings/different aftermarket bearings - would this fix my issue? I have an analytical balance (extremely accurate scales) at my disposal so I could check the weight of these bearings to make sure they're legit - however I don't know how heavy they should be! I'm also an idiot and threw out my old bearings so I have no way to check against the old ones! PS. I am measuring the bearings from the corner with a micrometre - I've seen this method done before so is it okay still? - I don't have the tool to measure the centre unfortunately Thanks!