Matt:
According to Roger Williams, thrust bearings installed backwards
will wear rapidly and eventually fall out. But take heart, you can fix
thrust bearings without pulling the motor or dropping the crank.
I would not worry about being 0.001" out of spec, rather if the
clearance increases rapidly to say, 0.015" then you clearly have a
problem. If this is the case you will need to drop the oil pan and
remove the rear main bearing cap. Use a dental pick to push out the old
bearings, and slide in new bearings making sure the grooved side of the
bearings face their respective crank thrust surfaces (e.g. rear bearing
faces rearward, front bearing faces forward). Reinstall the bearing and
oil pan, fill with oil and voila! You have repaired the problem in under
2 hours. Since it is so easy, you may wish to do it simply for peace of
mind.
When the thrust washers fall out, there will be 0.040" (?) or
more end float. If you don't replace the bearings immediately when this
occurs, the block and crank will likely be scrap.
Vance
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of mjmullin@juno.com
Sent: August 21, 2006 5:21 AM
To: 6pack@autox.team.net
Subject: Crank end float
Hi all:
Thanks to Kai, Jim, Rick, and Gary for their responses regarding the
intermediate pipe crossover question. I do run out of steam in the
higher rpm
range, but don't want to loose the Ansa sound either.
After hearing about crank thrust washers going in backwards (I've only
assembled one engine in my life, and that's the one in the '6), I put a
dial
indicator on the crank damper this weekend to find I've got 9 thousands
end
float on the crank (cold engine). Bentley manual says 6 to 8 thou. At
what
point do I start to become worried and drop the oil pan? How much end
float
will there be when the thrust washers drop into the oil pan?
As always, thanks for your valued advice.
Matt Mullin - 6-PACK Chairman
|