A couple of questions: Why are
two of the bolts larger? What is the torque spec on these bolts for
the 20B? I seem to recall 26-28 ft-lbs. I can’t get a torque
wrench on the bolts without removing the re-drive, engine mount and
flywheel, but I have a pretty well calibrated arm.
Al
When you add torque to those bolts, the bolts closest to them will go
under torque.
So go through the whole torque sequence several times if at all possible.
This has been the case on every engine I have built.
Lynn E. Hanover
I don't havea Mazda Manual, but
generally in a case like this there are 2 ways to tighten the bolts
correctly:
a) Tighten 2 opposite bolts until seated -
then torque each to spec. All other bolts are tigthtened spreading out from
the 2 torqued:
e.g. Torque the 2 big bolts then: 1st bolt to
left of one big b. - 1st bolt to the left of the other big b. - 1st
bolt to the right of the one big b. - 1st bolt to the right of the
other big b. - 2nd bolt to the left...... you get the idea.
This way you have the pieces flat together on
a "centerline" and "lay" the rest down on each side of this centerline -
spreading it out so that no "wrinkles" are created....
b) A stepped sequence is shown in a manual:
mostly in cross pattern and something like 10 lb/18lb/26lb
FWIW,
Thomas
J.