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View Full Version : Harmonic Balancer Bolt Loctite or not?


skill3
08-20-2013, 04:19 PM
I heard a strange noise coming from the bottom side of the engine. This morning I discovered my Harmonic Balancer was cracked. I read the long thread about HB failure, but I couldn't find any comment about Loctite. Is there a recommended Loctite for the HB bolt. With 240 pounds of torque plus 90 degrees, I wouldn't think you would use Loctite. Am I right? Loctite or not? Any tips for removing the HB? I got the bolt loose, but I stopped there until my new balancer arrives.
Thank you in in advance for any tips.

mendonsy
08-20-2013, 07:39 PM
well .... the question is did the balancer split because the bolt came loose or did the bolt come loose because the balancer split??
I would think that the torque spec is plenty tight enough to hold it. My concern would be ever getting it out again with Loctite on it.
This is probably a question for Andy, Dennis, or Wayne to answer.

seans
08-21-2013, 09:26 PM
well .... the question is did the balancer split because the bolt came loose or did the bolt come loose because the balancer split??
I would think that the torque spec is plenty tight enough to hold it. My concern would be ever getting it out again with Loctite on it.
This is probably a question for Andy, Dennis, or Wayne to answer.
+1

Is it possible to get a camera in there and post a picture of the harmonic balancer so it is possible to see how it split?

I have a harmonic balancer waiting in a box for me to install it as a preventative maintenance measure (108K miles), so I'd like to hear the answer about using Loctite in addition to the proper torque technique as well.

skill3
08-21-2013, 11:51 PM
I haven't removed it yet. My new HB should be in Friday. When I remove the old one, I will post a photo.

lindenengineering
08-22-2013, 12:42 AM
You don't need loctite!
BUT
You do need a crank holding tool and a long torque wrench and a nice long breaker/knuckle bar, we have one that's 4 ft long and have busted that 'un a few times!----Plus a breakfast of porrige oats!:laughing:

Torque is 240lbf ft Plus 90 dg angle torque additional tightening.

Please don't be tempted to block the flex plate, it will distort and cause all sorts of problems you REALLY don't want to hear about!
Dennis

skill3
08-22-2013, 04:38 AM
Anyone have suggestions for a "crank holding tool"? For those who have replaced their HB, what did you do to torque the HB bolt and keep the crank from turning?

Aqua Puttana
08-22-2013, 01:10 PM
Anyone have suggestions for a "crank holding tool"? For those who have replaced their HB, what did you do to torque the HB bolt and keep the crank from turning?

http://www.samstagsales.com/mercedes.htm

54178

54180

There are also other suppliers. Maybe Europarts SD rents this?

vic

skill3
08-22-2013, 03:05 PM
http://www.samstagsales.com/mercedes.htm

54178

There are also other suppliers. Maybe Europarts SD rents this?

vic
I've tried to contact this company with no reply. Does anyone know where I can purchase this tool?

Aqua Puttana
08-22-2013, 03:25 PM
I've tried to contact this company with no reply. Does anyone know where I can purchase this tool?

http://www.amazon.com/s/?ie=UTF8&keywords=mercedes+tool&tag=googhydr-20&index=aps&hvadid=15645683607&hvpos=1s1&hvexid=&hvnetw=g&hvrand=1674490211132217087&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_377jkqcgi_b#/ref=nb_sb_noss/187-3416451-8553929?url=search-alias%3Daps&field-keywords=mercedes+flywheel+tool&rh=i%3Aaps%2Ck%3Amercedes+flywheel+tool

Some detail is here.
http://sprinter-source.com/forum/showthread.php?t=24915

lindenengineering
08-24-2013, 02:40 AM
We simply made a tool up with flame cutter to make 1/2" plate with a hole in the middle to pass a socket through. Then scab welded a 1" diameter steel tube to one end that will end up contacting the shop floor as anchor. Then weld three 1/2" tongues on the plate at 90 degrees to engage into the spokes of the front crank pulley. (flat side to the spokes)
Then a 3/4 Snappy torque wrench for truck wheel nuts (has a capacity of 750lbf ft) A spendy mamau!

Tool looks a bit medieval, like a cudgel, say out of one of Alex Baldwin's credit card ads, but works a treat!:thumbup:

For those across the pond this is what I am referring to!
http://www.youtube.com/watch?v=E4m3t_7jnTw
Dennis