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Old 03-01-2001, 03:02 PM   #1
Scooby Specialist
Member#: 1346
Join Date: Apr 2000
Post Underdrive pulley problems

Yup, as of late, I've been having some issues with my UD pulley. It sounds like the pulley is vibrating-there's a definite chugging noise coming from there. Has anyone else had this problem?

It's a tremendous pain in the butt...sounds like the engine is really wheezing. Anyone able to diagnose the sound? Maybe the pulleys need to be tightened?

I'm seriously considering removing the pulley...I just need a bigger breaking bar...but if there's a way for me to sneak a box wrench in there and fix it, that would be ideal.
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Old 03-01-2001, 04:23 PM   #2
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Member#: 2974
Join Date: Nov 2000
Location: Portland, OR SPEC

Had mine on for 10k mi and had no problems. Check belts. It probably needs adjustment.

There is a potential larger issue with no vibration damping that I believe donjuan posted very recently, something written by Dinan.
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Old 03-01-2001, 05:16 PM   #3

OT, make sure that it is tight! A loose pulley can destroy your engine crank shaft if it wipes out the key!


P.S. A dampener is NOT needed on a horizontally opposed four Subaru!
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Old 03-01-2001, 05:36 PM   #4
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Chapter/Region: NESIC
Location: Boston MA, USA
2008 Outback XT


I don't know much about engines, but this article http://www.i-club.com/ubb-files/Foru...ML/001676.html has very good points about the risks of using an UD pulley. There's also a VERY compeling argument to why it doesn't matter that the Subaru engine is a boxer.
From my point of view, the bottom line is that the power gain (i.e., fun factor) does not make up for the risks. However, if you do not run the engine to high RPMs then apparently the risk is lower.... then again if you are making modifications like these you are probably the type guy/gal that likes to run high RPMs :-)

Just passing the word around. I'm not technicaly savy to be making recomendations. THis is just my opinion based on what I've read so far.

my 0.00000000001 cents


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Old 03-01-2001, 07:56 PM   #5
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Damn, I just checked that article. Really makes me want to uninstall the sucker...and I don't understand everything Dinan said even.

I'm going to snake in a wrench and see what I can do to it to tighten the bolts, but I may have to bring it to someone more adequately equipped and less likely to make the problem worse...I just don't think I can afford that at this time...
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