Harmonic Balancer??

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1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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goatcheez
Posts: 16
Joined: Sat Jun 04, 2011 1:53 am
Year and Model: 1996 850 Wagon
Location: Illinois

Harmonic Balancer??

Postby goatcheez » Fri Jul 08, 2011 12:59 am

1996 850 Wagon N/A 120,000 miles
Okay, Once again I am stumped. After hearing a "clattering" noise coming from the serp belt area ever since I bought the car (about a month ago), I have slowly tried to narrow down the cause. I've replaced the AC compressor (AC didn't work anyway and clutch was shot), the serp belt itself, new tensioner and guide pulley. I thought I had it, but it's back again. It's a intermittent "clattering" when car is at idle. It's definetly coming from the serp belt area and not the timing belt. Motor runs great. Hamrmonic Balancer?? What is the normal lifespan of the HB and how hard is it to replace? Anyway to check it's condition before pulling it off?? Any help is once again greatly appreciated.

goatcheez

Ozark Lee
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Re: Harmonic Balancer??

Postby Ozark Lee » Fri Jul 08, 2011 1:13 am

Have you tried just removing the serpentine belt and running the car? The dash will light up like a Christmas tree but it won't hurt anything.

I can only remember one member that had a harmonic balancer problem and it screwed up his timing since it slipped on the crankshaft. He was going nuts for weeks until he figured out the root cause of the problem.

If it were me I would pull the serpentine belt and see if the noise goes away.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC - RIP - Wrecked Parts Car.
'99 V70XC - Nautic Blue
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'96 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

goatcheez
Posts: 16
Joined: Sat Jun 04, 2011 1:53 am
Year and Model: 1996 850 Wagon
Location: Illinois

Re: Harmonic Balancer??

Postby goatcheez » Fri Jul 08, 2011 1:32 am

Good idea! I'll give it a try this weekend while I'm working on my rear wiper / washer issue. If it is the HB (I'm betting that it is), how tough of a fix is it?? Thanks Lee!!

goatcheez

Ozark Lee
MVS Moderator
Posts: 14075
Joined: Thu Sep 07, 2006 2:24 pm
Year and Model: Many Volvos
Location: USA Midwest
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Re: Harmonic Balancer??

Postby Ozark Lee » Fri Jul 08, 2011 1:39 am

If it is the HB (I'm betting that it is), how tough of a fix is it?


That kinda depends on where it broke (if it broke). If it is just on the front end it is plug and play and it is very easy after you jack up the car and peel the inner wheel well up.

If the woodruff key broke and the timing slipped then that it is a different kettle of fish since you will need to re-time the engine.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC - RIP - Wrecked Parts Car.
'99 V70XC - Nautic Blue
Previous:
'96 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

goatcheez
Posts: 16
Joined: Sat Jun 04, 2011 1:53 am
Year and Model: 1996 850 Wagon
Location: Illinois

Re: Harmonic Balancer??

Postby goatcheez » Fri Jul 08, 2011 2:00 am

Do they normally rattle in the final stages of life or do they just break. As I mentioned in my previous post the motor is running perfect so there is no key / timing issue. Clatter disappears upon acceleration. Could it be one of the other pulley's going bad or loose. Alternator? Power Steering?? I did check for play / loosness in the other pullies when I installed the new tesioner and guide pulley. Didn't notice anything substantial in my "wiggle" test. I'll try to gather some more info this weekend by using your serp disconnect idea.

goatcheez

ed7
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Joined: Fri Sep 03, 2010 9:32 am
Year and Model: V70XC 2001, 1998
Location: Lansing, Michigan
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Re: Harmonic Balancer??

Postby ed7 » Fri Jul 08, 2011 3:03 am

Get a chunk of hose about 2' long, stick one end in your ear and wave the other end near every moving thing on the front of the engine and see what you hear.
Ed

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bigdaddylee82
Posts: 302
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Year and Model: '95 850 GLT+94 parts
Location: Central Ohio via NW Aarkansas

Re: Harmonic Balancer??

Postby bigdaddylee82 » Fri Jul 08, 2011 3:06 am

Have you checked your engine mount down there? If it's wore out metal-to-metal it'll be vibrating/rattling, and sound like it's coming from the same area as the balancer.

- Lee

chax
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Re: Harmonic Balancer??

Postby chax » Fri Aug 29, 2014 1:26 am

I once installed a brand new tensioner that had a bad pulley: put the previous pulley on the new tensioner, and the sound went away. Could be that your old pulley had gone bad, and your new one started out bad. I mean, c'mon: it's plastic! Maybe some lubricant on that pulley would eliminate the problem.


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