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Harmonic Balancer??

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Harmonic Balancer??

Postby goatcheez » 08 Jul 2011, 00:59

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
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Re: Harmonic Balancer??

Postby Ozark Lee » 08 Jul 2011, 01:13

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
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Re: Harmonic Balancer??

Postby goatcheez » 08 Jul 2011, 01:32

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!!

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Re: Harmonic Balancer??

Postby Ozark Lee » 08 Jul 2011, 01:39

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
'96 850 N/A
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC - RIP Killed by a drunk driver.
Previous: 1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
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Re: Harmonic Balancer??

Postby goatcheez » 08 Jul 2011, 02:00

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
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Re: Harmonic Balancer??

Postby ed7 » 08 Jul 2011, 03:03

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.
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Re: Harmonic Balancer??

Postby bigdaddylee82 » 08 Jul 2011, 03:06

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
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