Ok here is my issue.

At idle i have a very noticable clatter comming from my engine.Give it
just a little throttle ( like 200rpms) and it goes away.At cruise it is
non existant.While stopped at stop lights or at idle people are looking
at me.In the am when its cold it does not do this untill it has warmed
up for about 5min.No noticable difference in driving or power.Stomp on
the gas and just about breaks the back tires loose.I thought it might
be the vac pump because it sounds like its comming from that direction
but hard to tell.When at idle i cannot move the wastgate arm so i think
its pulling good vac,but i dont have a guage.Take off serp. belt and no
noise.turn the ac on and it gets louder and more noticable,turn the
wheel all the way left/right and it gets louder.http://www.dieselplace.com/forum/smileys/smiley7.gif

I was told it could be the harm. balancer making this noise??How can i check that and how much are they??

Like i said other than the loud clatter at idle it runs fine.Idle is
about 800 by the way...If anybody is in the DFW area and would like to
listen to it to help me better trbl shoot that would be good too...

Thanks..

truck is a 95 td with straight pipes, and thats the only mod so far.170k

green tag pump,new pmd and cooler.

Look real close at the crank pulley and harmonic, as well as tensioner pulleys and the pulleys on the belt drive. These parts wear out and can cause engine failurer if left unchecked.


That idle is 200 rpm high. Make sure the CTS in the water crossover is attached to it's connector and giving an ohm reading that corresponds with the engine temp. Edited by: quantum mechanic

CRAAAAAP

I dont like that failure word....I will check those items tomorrow
night.Any idea on how much a harm bal, crank pulley costs?????

Also what am i exactly looking for?

Thanks for the quick reply...

Look for urethane extruding form the harmonic.


http://www.dieselplace.com/forum/uploads/quantummechanic/2004-11-17_203032_harmonic.jpg


The black part stickin out means it's dying. pn#18154688 if I read the numbers right. $67 on www.gmpartsdirect.com (http://www.gmpartsdirect.com)


The crank pulley will have slack in it and cracked urathane center. Watch it with the engine idling, for vibration. Costs more than the harmonic.


http://www.dieselplace.com/forum/uploads/quantummechanic/2004-11-17_203823_cts.jpg


This is the CTS (coolant temp sensor)Edited by: quantum mechanic

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Here the info on the pulley also


NOw I got to go look at mine for Cracks








GM PART # 12557345
CATEGORY: Engine Crankshaft and Camshaft Balancer
PACK QTY: 1</TD>
<TD =reg vAlign=bottom>CORE CHARGE: $0.00
GM LIST: $216.39
OUR PRICE: $123.35</TD>
<TD align=right><!--< name="p12557345" ="text" value="1" size="2" maxlength="3">
< ="" name="parts" value="12557345">-->http://www.gmpartsdirect.com/images/add_to_cart_btn.gif (http://www.gmpartsdirect.com/results.cfm?addtocart=1&amp;addpartnumber=12557345&amp;sin glepart=1&amp;partnumber=12557345)</TD></TR>
<TR vAlign=top background="images/trans.gif">
<TD =reg colSpan=3>DESCRIPTION: PULLEY
</TD></TR></T></TABLE>

I called around to auto parts stores and Oreilly's has it for $50 in
stock.I asked if it was for my engine code s and he said it shows
engine code F but that in his crossreference screen it shows that it
cross references with gm part# 10154688 which is what mine is.How
different are the balancers between the F engine and the S engine?I
wouldnt think it would be a difference.since it has been having this
clacking sound for almost 2 months now i would liek to get it fixed
asap,now that i think i know what is causing it, before the engine says
bye bye sucker.http://www.dieselplace.com/forum/smileys/smiley5.gif

should have mentioneed this in the above post...This price and info is for the harmonic balancer...

Ok i think i found out why its chatering now..sorry for the crappy pics
but i used my camera phone to take them at night with a
flashlight.These are pics of my pulley.There is a chunk of rubber
missing from the middle.I can put two fingers all the way through the
middle..Part that really sucks is that I already ordered the harmonic
balancer and it will be here tomorrow...Any idea how much the pulley is
at the Stealer???

http://www.dieselplace.com/forum/uploads/9565/2004-11-18_173456_picture-1.jpg

Pick #2 .that hole is the missing chunk.

http://www.dieselplace.com/forum/uploads/9565/2004-11-18_173849_picture.jpg

about $170.00 at my dealer

Rock auto. $ 54.00 I already bought one from the dealer for $ 175 then I found Rock auto and bought one from them. They look the same (the pulley and rubber).

When the rubber falls out it's already slipping and that means the crank and the belt are moving at different speeds.


Did you get a look at the rubber on the harmonic?


I see a white spirit like face in both picsEdited by: quantum mechanic

Rock auto. $ 54.00 I already bought one from the dealer for $ 175 then I found Rock auto and bought one from them. They look the same (the pulley and rubber).





part number is 594-037 from dormanEdited by: bowtie

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HEY HEY look what I found. It is listed as a harmonic Balancer BUT clearly shows and description is of a pulley and for $69.00 dollars. I found mine busted thats to this posting about clatter from engine.


http://www.midwayautosupply.com/


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<TD vAlign=center align=middle width=250 height=125>http://www.midwayautosupply.com/images/dorman/594-037_3X.jpg
UPC: 019495020318
Amazon ASIN:B0002KKKK8 </TD>
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DORMAN HARMONIC BALANCER, 2002-94 6.5L (395) DIESEL CHEVROLET, GMC TRUCK
<CENTER>Part # DOR-594-037 </CENTER>
Suggested Retail : $104.99
YOUR PRICE : &lt;&gt;$69.99 </>
http://www.midwayautosupply.com/images/add_to_Cart.gif (javascript AddThisToCart3669;)&lt;&gt;
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Dorman Harmonic Balancer, 2002-94 6.5L (395) Diesel Chevrolet, GMC Truck </TD></TR>
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Serpentine Belt, 7-3/4" Diameter, 1-1/2" wide, 7.8 lbs, Hollander #309-493, Make &amp; OE # GM 12557345. For complete detailed specs, please see the Dorman Products catalog here.<A> (http://www.rbinc.com/)</TD></TR>
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That is the EXACT part and brand I bought...Thats the part that has the
nice chunk missing from it.I can lay under neath and turn the pulley by
hand about 2in wither direction untill the bolts catch it.I thought the
big piece behind that was the harmonic balancer.I looked at that piece
and couldnt see anything wrong with it.Paid 64.96 out the door at
O'reilly's auto parts here in fort worth.I'll be switching it out
tonight..













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HEY HEY look what I found. It is listed as a harmonic Balancer BUT
clearly shows and description is of a pulley and for $69.00
dollars. I found mine busted thats to this posting about clatter from
engine.


http://www.midwayautosupply.com/


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<td align="center" height="125" valign="center" width="250">http://www.midwayautosupply.com/images/dorman/594-037_3X.jpg
<font color="white" size="1">UPC: 019495020318
Amazon ASIN:B0002KKKK8 </font></td>
<td align="center" valign="center" width="20"> </td>
<td align="center" height="125" valign="center" width="210">
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<font color="red" face="Verdana" size="1">DORMAN HARMONIC BALANCER, 2002-94 6.5L (395) DIESEL CHEVROLET, GMC TRUCK </font>
<center><font color="#003194" face="Verdana" size="1">Part # DOR-594-037 </font></center>
<font color="#003194" face="Verdana" size="1"></font><font color="#000080" face="Verdana" size="1">Suggested Retail : $104.99</font>
<font face="Verdana" size="2">YOUR PRICE : <font color="#ff0000">&lt;&gt;$69.99 </font></font>
<font face="Verdana" size="2">http://www.midwayautosupply.com/images/add_to_Cart.gif (javascript%20AddThisToCart3669;)<font color="#ff0000">&lt;&gt;</font></font>
<font face="Verdana" size="2"><font color="#ff0000">http://www.midwayautosupply.com/images/mail_friend.jpg (http://www.midwayautosupply.com/sendafriend.asp?http://www.midwayautosupply.com/detailedproductdescription.asp?3669)</font></font></td></tr></t></table></td>
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<font color="#003194" face="Verdana" size="2">Dorman Harmonic Balancer, 2002-94 6.5L (395) Diesel Chevrolet, GMC Truck </font></td></tr>
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<font style="font-size: 8pt;" color="#003194" face="Verdana">Serpentine
Belt, 7-3/4" Diameter, 1-1/2" wide, 7.8 lbs, Hollander #309-493, Make
&amp; OE # GM 12557345. For complete detai

In my previous post i stated that i ordered a harmonic balancer,but
like i said what i got when it came in was what is hown above.It was
supposed to come in this morning but they got it last night.Do i need a
pulley remover to pull it off? Im going to swap out the pulley tonight
and will let you know how it works....http://www.dieselplace.com/forum/smileys/Rock%20On.gif

It just unbolts. It will fall off after that.

Do you just unbolt it from underneath the truck?

I usally take the shroud and fan off, not too many bolts 10mm shroud and 13mm on the fan. then use a breaker and a 15mm on the 4 crank pulley bolts. Then, if you care to remove the harmonic you can attach a puller.

What are the torque numbers for the pully? I am wondering it worn out pulleys going unchecked, is what is causing all the broken cranks? In other words. if you were to stay on top of the pully and hamonic balancer, I bet your crank would last 300k miles easily. I will check mine this afternoon for sure.

I know it's a little late, but Fluidampr is supposed to have one of their balancers for the 6.5 application by end of this month or next. I am guessing, based on their current product line, that pricing will be around $300-$400.

my advice.....you get what you pay for.....spend the extra money and get the balancer and pulley from the stealer. thats what i did. also when your changing is a good time to pull and clean radiator and put a new front main seal in.


200 ft lbs. on torqueEdited by: steiner43511

changed ou the pulley.Took less time than an oil change.Started her up and no clatter whatsoever.the old pulley was torn all to hell.The inside rubber could completely turn around with out turning the outside ring..Thanks for all the help guys...

:) Good info in this thread. I will have to check out mine now with 170,000 kms on it.

Just as a point of reference, the Harmonic Balancer that was pictured previously is not really the balancer, rather it is the pulley drive. Pulley drive is elastomer and bearing equipped so that the rapid momentary changes in crankshaft speed associated with high compression Diesel combustion are not transferred to the belt-driven accessories.

The real harmonic balancer is behind the pulley drive and is bolted to the crank. It's also a great idea to check the elastomer in this to see if it's extruding or if the inertia ring (outside ring) has slipped. It's this [larger] balancer that dampens crankshaft movement and would be responsible for the crankshaft breakage issue. I only know this deal as well as I do 'cause I was the Dir of Engineering at Dorman when they came out with this replacement part.

Jim

I'm really interested in the fluidampr harmonic. I would be willing to get one and see how I like it.

Just as a point of reference, the Harmonic Balancer that was pictured previously is not really the balancer, rather it is the pulley drive. Pulley drive is elastomer and bearing equipped so that the rapid momentary changes in crankshaft speed associated with high compression Diesel combustion are not transferred to the belt-driven accessories.


JimYeap In fact that is what it said in the description of the part. Thats why it took awhlie for me to locate that part number and Manufacturer was listed incorrectly.

Does anybody have (or know where to find) a good picture of this part as it sits on the engine? If possible, point out the rubber that we're supposed to be looking for that signifies a dying balancer (or pulley?).

This is the harmonic looking from the oilpan forward toward the front of the truck. the black rubber oozing out is the failure.

The crank pulley is where the belt goes around the lowest pulley on the block.

fluidampr hasn't taken me up on my offer to publicly R&D their 6.5L harmonic on the forum, yet.

Does anybody have (or know where to find) a good picture of this part as it sits on the engine? If possible, point out the rubber that we're supposed to be looking for that signifies a dying balancer (or pulley?).
Don't have any pictures yet, too wet still, But if you lay under the front of the engine and look up at the lower pulley that the belt goes on you should be able to see the back side of the pulley is rubber mounted. Thats where my was cracked all the way around the center hub. also get a small mirror and look at the front center section of the pulley and you should see the 4 spokes, and 4 bolts flanges. I could see where mine had been hitting against each other and left shiney marks. If either of these conditions or found or rubber chucks are found missing then replacement is needed. Hope that helps for now till someone gets pictures posted, which I will do went I change mine out.:ro)

QM's picture and Bowtie's description ought to help a bundle. Thanks guys. I'll have to take a peek the next time I'm under the truck.

I took a picture of the one that i pulled off my truck.Im trying to post it but having a hard time getting it to the right size.Mine was cracked all the way around also,and i had the saem marks you'r describing/Mine also had a chunk of the rubber missing.Large enough to put three fingers through..I could lay under the truck and grab the pulley and move it freely untill the spokes hit the bolts..

95-6.5: If you don't mind, go ahead and just email me the picture. w_huismanatyahoodotcom. Thanks!

Mine isn't that bad yet, I don't think, but you can see on the front side where it has been spinning inside itself and hitting metal to metal for a while. Now if Fed EX could just hurry up and deliver it to me I'd be on the road again.

I have this exact same clatter, but have checked my crank pulley and it looks good. I really really dont want a broken crank so I guess I should pull it off to get a better look?? Could it be anything else?
Thanks

Take a look at the pulleys while the engine's idling. Wobble in any pulley is trouble but look for the noise maker.

WELL heres the pictures of my pulley, more damage than I thought there was. notice the bolts and how the wear show up on them too. :eek:

Thanks Bowtie. Now... is that the pulley, the balancer, or both?

thatsa just the pulley

WOW I JUST STARTED IT BACK UP AFTER A NEW PULLEY AND a new belt just cause I was there. also found a 10 mm bolt to my A/C compressor mounting bracket was rubbing something and bout to fall out. the head of that bolt had been rounded down a bunch from its 15 mm hex to bout 12 mm round. Installed it till I get to store to buy one and WOW this truck is quite. When I bought it everyone told me how quite it was for a diesel and lately everyone else was telling me how loud it was. Guess I didn't pick up on it getting louder, but you sure can tell now. THANKS EVERYONE now what else is wrong with my truck that I haven't found yet cause ya ain't talked about it lately. LOL

Here's a pic on the Harmonic Balancer.Getting mine changed at the dealer.

I'm guessing the failing point of the above pictured balancer (which I realize is new) is the seam between the two black cylindrical areas?

that would be my guess from what I'd seen

that is what fails on the balancer. CROWNE: i hope you are changing the pulley too. those are just as much of a culprit as the balancer.

I changed both at the dealer. :) Had the same problem as 95-6.5