94, Legacy harmonic balancer question

A

Al A.

Hi All,

I have a chance to pick up (for near zero cost) a 1994 Subaru Legacy
sedan. It has a 4 Cyl. enging,75K miles,generally decent body, etc.
not sure of too much else at this point. I'm going for a closer look
later in the week, but hoped to gather some data first.

Like all such deals, something is wrong with it. In this car, the
harmonic balancer came loose about 3 months ago, and it messed up the
slot in the shaft that the woodruff key for the balancer fits into. At
the time, the owners mechanic advised that pulling the crank to fix
the slot was not a viable option, but offered (as a no cost and
"what-have-you-got-to-lose" type of repair) to put the key back in and
fix it in place with JB Weld.

Well, it held for about 3 months. last week, it came loose again, and
seems to have scarred up the ID of the balancer. He went out and
bought a new car, and offered me this one on a "gimmie whatever it is
worth to you" sort of offer.

My thinking is that I could put a new key in what remains of the
slot, and zap in the missing metal from the slot with the MIG machine
and dremel to fit. Or maybe make a fake key out of something the mig
filler will not stick to (graphite, copper or whatever) put in place
and weld around it. Then pull it out, leaving a vague woodruff keyseat
shaped hole. Or gimmie a better idea.

I would likely need to replace the balancer as it looked pretty
gouged up, at least at a glance.

I work with the owner, and a pretty good friends with him, and when
the balancer is not flopping around, the car runs great. If I could
effect a decent repair, this car would make a great cheap to run
around towner.

Anyone know if this is a common problem with these cars? How do you
guys rate the likelyhood of a sucessful repair? I know little about
Subarus so any thoughts, comments, alternative ideas for repairs,
etc., would be a big help.

Thanks, your input is much appreciated.
AL
 
Al said:
Hi All, snip.
Anyone know if this is a common problem with these cars? How do you
guys rate the likelyhood of a sucessful repair? I know little about
Subarus so any thoughts, comments, alternative ideas for repairs,
etc., would be a big help.

Thanks, your input is much appreciated.
AL

Your repair idea should work well i.e. new key, mig welding, then dremel
to bring it to correct shape.

This can be common if the mechanic who removes the balancer in order to
change out timing belts does not torque it properly when replacing it.
They need around 120 ft-lbs or so - depending upon model. It is
difficult to get this amount of force without subaru's crank pulley tool
or something similar to hold the pulley in place while tightening the bolt.
 

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