Wayne, your decision re: whether you need to pull the crank needs to be made
before you install bearings. If you try to check with plastiguage using old
bearings you will get false readings because of wear of crank and bearings.
Also
you will not be able to check out of round, which you must consider. Bearing
clearance will need to be in the .0015-.0025 range, which will not leave much
room
for error. You may be able to guess at main condition if the rods are ok, as
rods
are generally first to wear, but look out for rods that were cut before and
mains
that were not. John
Rengrave@aol.com wrote:
> In a message dated 1/6/99 11:09:45 AM Eastern Standard Time,
> vscjohn@iamerica.net writes:
>
> << Wayne, plastiguage is used to measure bearing to journal clearance. If you
> are
> going to replace bearings you need to first measure the journals with a mike
> to
> check wear/size/out of round. Also examine for scoring. Then determine
> whether
> the crank needs to be turned. When you reassemble with new bearings use
> plastiguage to check clearance. John >>
>
> I intend on replacing the bearings with the engine still in the car. I though
> I could check the bearing wear between all the existing bearings and the crank
> surface, then I would know what thickness I would have to buy for new
> bearings. I don't think I would have enough room to use a mike especially the
> front main bearing area.
> Of course I intend on checking for any ridges that may be present on the
> bearings or the crank surface, then I guess I will have to pull the crankshaft
> out and have it turned at a machine shop. :(
>
> Wayne from Massachusetts
> 1973 TR6 Mallard/New Tan
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