Engine rebuild part 6: Crank finally arrived. Measuring clearances and ordering bearings.
Finally my crank arrived. Actually the same day I showed up early in the morning and held a little speech regarding customer satisfaction. They used two months and all that was needed was polishing. I bet it happend the same day I ruined the morning glory. But the polishing is actually good news since that means I can order the same size bearings :)
<div class="separator" style="clear: both; text-align: center;">
</div>
<div class="separator" style="clear: both; text-align: center;">
</div>
The pictures above was before cleaning off the journals. Seems like there was some residue or fluid from the polish process.
When I cleaned up the oil channels I noticed that the entries were very sharp and not chamfered. I took a lot of pictures of the crank before I had it polished but not a single one was of the oil holes so I don’t know how they were before polishing. I will do a tiny bit of chamfering to avoid a sharp edge ripping off bearing material but no “directional cuts” or other internet magic.
<div class="separator" style="clear: both; text-align: center;">
</div>
<div class="separator" style="clear: both; text-align: center;">
</div>
To be sure that STD size bearings was ok I measured the main journal diameter + oil clearance using the old bearings. And I could use my new measuring tools.
The micrometer was off by 0.02 so a calibration was needed. Since I bought the cheapest on I could get it took quite a while as I had to disassemble it and insert a new spacer for the locking hex screw to work. Crap.
<div class="separator" style="clear: both; text-align: center;">
</div>
<div class="separator" style="clear: both; text-align: center;">
</div>
I used the method where I zeroed out the dial bore gauge in the micrometer for each journal and moved the gauge around until i got the min value in two location 90 deg apart. Plastigauge would work too but is said to be less accurate and a lot more work as you have to have the crank in place.
<div class="separator" style="clear: both; text-align: center;">
</div>
Results were ok and well within spec. My guess is that journal #1 was polished a bit more than the rest as it is 0.01mm off the rest.
Oil clearance was a bit above standard on #3 + horizontal measured values but well within max.
This was the old used bearings so I expect the new ones to be more consistent.
STD diameter: 51.980-52.000 mm {2.0464-2.0472 in}
STD oil clearance 0.019-0.035 mm {0.0007-0.0013 in}
Max oil clearance 0.10 mm {0.0039 in}
(mm)
cyl dim clr vertical/horizontal
<div style="background-color: white; font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">1 = 51.99 c 0.03 / 0.05</div><div style="background-color: white; font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">2 = 52.00 c 0.02 / 0.04</div><div style="background-color: white; font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">3 = 52.05 c 0.04 /0.06</div><div style="background-color: white; font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">4 = 52.00 c 0.02 / 0.04</div><div style="background-color: white; font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">5 = 52.00 c 0.03 / 0.05</div>
Since engine is from different car the sales guy over at the Mazda dealer was reluctant to start digging after parts without a VIN or reg number. By using onlinemazdaparts.com and mazdaepc.com I was able to piece together what I needed.
(STD dim, no overbore)
<div dir="ltr" style="background-color: white; color: #212121; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 13px; line-height: 19.5px; unicode-bidi: isolate;"><div class="gmail_quote"><div dir="ltr" style="unicode-bidi: isolate;"><div>- L5Y111SE0 x 1 Rod bearingset </div><div>- L3Y211SG0 x 1 Engine Bearing set </div></div></div></div><div dir="ltr" style="background-color: white; color: #212121; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 13px; line-height: 19.5px; unicode-bidi: isolate;"><div class="gmail_quote"><div dir="ltr" style="unicode-bidi: isolate;"><div style="font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">- L3Y211SJ0 x 1 Thrust bearing</div><div style="font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">
</div><div style="font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">And here is a bonus picture of what fell out of the oil pump pickup when I was going through the parts:</div><div class="separator" style="clear: both; text-align: center;">
</div><div style="font-family: SFNSText, 'Helvetica Neue', sans-serif; font-size: 15px; line-height: 18px;">
</div></div></div></div>That screen inside the tube is there for a reason :) I’ll inspect the pump closely to see if it needs to be replaced.
Comments