Wobbly Harmonic Balancer - S-10 Forum
 
LinkBack Thread Tools
post #1 of 15 Old 10-15-2015, 10:16 PM Thread Starter
Registered User
 
Join Date: Aug 2013
Location: Lafayette, LA
Posts: 359

User is: crice63 is offline
Wobbly Harmonic Balancer

So I just finished replacing the water pump, got everything back together, and was watching for leaks. I noticed the harmonic balancer didn't look right at all. Here is a you-tube video of the engine running. You might have to full-size the screen to see it well, but the balancer looks like it is running funky. I just don't know if it was doing it before the water pump change, but I noticed it right away now so I'm thinking this is new. Is one of my belts too tight?


1985 GMC S-15 / 2.8L / Auto
crice63 is offline  
Sponsored Links
Advertisement
 
post #2 of 15 Old 10-16-2015, 10:09 AM
Boozebag
 
Mad Max's Avatar
 
Join Date: Jun 2009
Location: Saipan (!)
Posts: 8,878

User is: Mad Max is offline
Re: Wobbly Harmonic Balancer

The balancer has an elastomeric band holding the weight on the hub. It deteriorates over time and can cause the weight to shift making it out of sync to the hub and can also cause a wobble.
I suggest replacing the balancer. They are not very expensive.
This will affect vibration and in extreme cases, the crank can develop problems.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
Mad Max is offline  
post #3 of 15 Old 10-16-2015, 06:23 PM Thread Starter
Registered User
 
Join Date: Aug 2013
Location: Lafayette, LA
Posts: 359

User is: crice63 is offline
Re: Wobbly Harmonic Balancer

Is this a difficult job? If I have to remove the water pump again I might need a new timing cover, judging from the two bolt holes I've stripped already.

1985 GMC S-15 / 2.8L / Auto
crice63 is offline  
 
post #4 of 15 Old 10-17-2015, 11:04 PM Thread Starter
Registered User
 
Join Date: Aug 2013
Location: Lafayette, LA
Posts: 359

User is: crice63 is offline
Re: Wobbly Harmonic Balancer

Ok, got a HB on order. $37. I hope this is the problem.

1985 GMC S-15 / 2.8L / Auto
crice63 is offline  
post #5 of 15 Old 10-18-2015, 10:28 AM
overthinker extraordinar
 
jcricket's Avatar
 
Join Date: Sep 2014
Location: littleton colorado
Age: 54
Posts: 650

User is: jcricket is offline
Re: Wobbly Harmonic Balancer

Quote:
Originally Posted by crice63 View Post
Ok, got a HB on order. $37. I hope this is the problem.
I bet it is. Been there, done this.

85 S10 Durango 2.8L extcab rwd 36k actual miles.
"true wisdom is knowing you know nothing" Paraphrased from Socrates
jcricket is offline  
post #6 of 15 Old 10-19-2015, 11:42 AM
Boozebag
 
Mad Max's Avatar
 
Join Date: Jun 2009
Location: Saipan (!)
Posts: 8,878

User is: Mad Max is offline
Re: Wobbly Harmonic Balancer

All you have to do is remove the belts, the radiator shroud and it is accessible. You'll need a harmonic balance puller, they are cheap at Harbor Junk, or you can rent from one of the parts markets. Be careful re-installing it. a Hammer can mess it up. There is a specific tool to reinstall the balancer too. The parts guys may have it.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
Mad Max is offline  
post #7 of 15 Old 10-19-2015, 02:25 PM
B4U Task Force
 
Rhotpursuit's Avatar
 
Join Date: Sep 2003
Location: Spanaway, Wa
Posts: 19,494

User is: Rhotpursuit is online now
Re: Wobbly Harmonic Balancer

The Harbor "Junk" as you say...lol puller also has the installation pieces iirc. Beee awhile nd am too lazy to go to the garage...

U.S.C.G. "Making sure the Navy doesn't get lost since 1790"

Apple Red 96 SS
Rhotpursuit is online now  
post #8 of 15 Old 10-20-2015, 12:31 AM
Registered User
 
Join Date: Oct 2003
Location: The Nest
Age: 42
Posts: 2,126

User is: The_Raven is offline
Re: Wobbly Harmonic Balancer

My MAC harmonic balancer removal and installation tool has been one of my best investments. I always hated pulling the balancer on with a crank bolt. I was lucky and never stripped one, but there were a couple times it was a little touch and go.

Yukon: The daily driver
Tha toy: 1973 Datsun 240z 12.71 @115
Tha other Toy: 1923 T-Bucket
Another Toy: 1987 Buick Skyhawk
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


"If you're not living on the edge, You're taking up too much space."
The_Raven is offline  
post #9 of 15 Old 10-21-2015, 09:04 AM
Boozebag
 
Mad Max's Avatar
 
Join Date: Jun 2009
Location: Saipan (!)
Posts: 8,878

User is: Mad Max is offline
Re: Wobbly Harmonic Balancer

I bought a balancer install tool on Ebay- I don't remember the price, but it works great. The Harbor Freight remover works well also.
Raven has a good point, the tool can mess the crank threads if you use the wrong cone adapter. You have to be careful and align it correctly, I also use grease on the "cone" adapter where it contacts the crank.

Overall, the job is not too complicated and usually takes about an hour to complete at a slow pace.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
Mad Max is offline  
post #10 of 15 Old 10-21-2015, 01:25 PM Thread Starter
Registered User
 
Join Date: Aug 2013
Location: Lafayette, LA
Posts: 359

User is: crice63 is offline
Re: Wobbly Harmonic Balancer

When I first bought my truck, my dad, who worked on the family cars his whole life until recently, seemed happy to cull his tools for "some of the older stuff" that he wouldn't use anymore. The box included the timing light, tach/dwell meter, compression gauge, old style torque wrench, other odds and ends, and lo, a balancer puller/installer. I used it on the crate 350 going into my el camino this summer, so this will be one thing I'm not doing for the first time. But it was out of the car with no fan, belts, etc. This shouldn't be too different I don't think.

1985 GMC S-15 / 2.8L / Auto
crice63 is offline  
post #11 of 15 Old 10-24-2015, 11:34 PM Thread Starter
Registered User
 
Join Date: Aug 2013
Location: Lafayette, LA
Posts: 359

User is: crice63 is offline
Re: Wobbly Harmonic Balancer

All done. It is only about an hour's worth of actual work, but that got extended over a 2 day period due to 1) puzzling about how to get the crank bolt out, keeping the crank from turning. Finally solved it by hooking an allen wrench into one of the holes on the dampener and bracing the long end against the underside of the water pump. Probably not ideal but it worked pretty quickly.



The dampener looked pretty bad once I got it off.

2) my puller tool was not also an installer. Had to run up to OReilly's to rent the installer, which worked fine.





3) Once I got the new dampener on, and went to put on the pulley, I discovered that the replacement part had been tapped with the wrong size holes. Well, not the wrong size, it was still taking a 10 mm bolt, but with fine threads rather than course . Of course none of the weekend box stores had any M10 1.0 x 30mm, or 3/8 24 1-1/4", but I took a chance on Pep Boys out by the mall and sure enough, they had exactly four of the US ones, and in grade 8. Wow.





So if you are buying parts from this company, beware. That little difference cost me an hour on a weekend. Wouldn't have been a 10 minute problem on a weekday.

4) Got so excited to find the bolts and get the pulley on that I left off the extra AC pulley! Crud. Had to pull the bolts back out again and reinstall. The AC doesn't work, so I was tempted just not to put it on, but I figured if I ever did get it working, I didn't want to have to pull the fan off again and etc. At least I wasn't out of beer....



Got everything back together, looks good, no leaks. Drove the tool back to OReilly's, they also took the core off my hands even though its not on their core sheet.

5) What took up most of the time, however, was cooking and eating a nice pulled pork bbq with friends. For some reason I didn't get any pics of that.

I do have what I hope is one last water pump question. Is this wet spot on the gasket a bad sign?


1985 GMC S-15 / 2.8L / Auto
crice63 is offline  
post #12 of 15 Old 10-26-2015, 09:27 AM
Boozebag
 
Mad Max's Avatar
 
Join Date: Jun 2009
Location: Saipan (!)
Posts: 8,878

User is: Mad Max is offline
Re: Wobbly Harmonic Balancer

Guess I was right about that "rubber band" on the balancer going bad...

Good move on the stainless hardware for the water pump!
I bet that the WP gasket is only stained. I don't think you will have any problem.
BTW, that A/C system is an aftermarket install. I don't know if it was a dealer install or an A/C shop install. Do you have an under dash A/C unit?

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
Mad Max is offline  
post #13 of 15 Old 10-26-2015, 03:00 PM Thread Starter
Registered User
 
Join Date: Aug 2013
Location: Lafayette, LA
Posts: 359

User is: crice63 is offline
Re: Wobbly Harmonic Balancer

Yes, the AC is under dash. I don't know the manufacturer--unmarked. Part of its not working was the blower under the dash. I got it working, but now the switches don't function correctly. The heater blows low on medium and medium on high, and the AC blower blows low on high only. I want to change to the new freon style but I'm pretty sure the compressor is bad. But mainly I've stalled on the switches. Duct doors seem to work ok-- I get air through the vents and heat on the bottom correctly, and air from dash vents on AC setting.

1985 GMC S-15 / 2.8L / Auto
crice63 is offline  
post #14 of 15 Old 10-26-2015, 04:29 PM
Boozebag
 
Mad Max's Avatar
 
Join Date: Jun 2009
Location: Saipan (!)
Posts: 8,878

User is: Mad Max is offline
Re: Wobbly Harmonic Balancer

The compressor is a pretty common unit. It looks like a Sanden, although I could be mistaken. Try rotating the center section of the clutch... if it's not seized, chances are the compressor is ok.
Some of the aftermarket A/C assemblies had funky controls - leading me to believe that is the problem with the control switches.
Any pix of the interior?

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
Mad Max is offline  
post #15 of 15 Old 10-27-2015, 11:51 AM Thread Starter
Registered User
 
Join Date: Aug 2013
Location: Lafayette, LA
Posts: 359

User is: crice63 is offline
Re: Wobbly Harmonic Balancer

Started a thread on it long ago, got sidetracked on dash removal etc. Eventually got everything back together but the climate controls are wonky--both blowers seems to work so it has to be switches, or wiring or ground. There are pics of the AC parts at teh top of the thread:

https://www.s10forum.com/forum/f299/i...st-gen-521335/

1985 GMC S-15 / 2.8L / Auto
crice63 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the S-10 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome