reversed harmonic balancer? - Page 2 - PeachParts Mercedes-Benz Forum

Brian Carlton · #16 02-04-2006, 11:10 AM

Quote:

Originally Posted by Matt L

I bet on a slipped balancer. I've seen this on many vehicles. I haven't seen it on a Benz, but I haven't worked on many.

If the balancer has slipped, you need a new one.

This would be a situation where the keys have sheared?? Possible damage to the crankshaft??

rg2098 · #17 02-04-2006, 11:11 AM

Quote:

Originally Posted by Brian Carlton

This is not what you said in the first post.

In the first post, I understood that the crankshaft is 180° rotated from approximately 0° when the cam marks are lined up.

In this post, you state that the cam mark is 180° from your expected position when the crankshaft is at TDC.

If the second scenario is the true situation, then it's a simple solution and the thrust washer needs to be installed 180° from it's current position. I do believe that it's possible to do this.

Sorry, late night posts can come out vague at times. When the CAM marks are aligned, the CRANK numbers are not visible and the TDC indicator is 180 degrees away at the opposite side it should be.

dannym · #18 02-04-2006, 11:13 AM

Quote:

If the second scenario is the true situation, then it's a simple solution and the thrust washer needs to be installed 180° from it's current position. I do believe that it's possible to do this.

Why does this sound familiar? Oh yeah I said the same thing.

The washer has 2 keyways on it. 1 at the mark and the other directly, 180 degrees, across.

It would be so much easier to check this before going at the balancer.

danny

Brian Carlton · #19 02-04-2006, 11:17 AM

Quote:

Originally Posted by dannym

Why does this sound familiar? Oh yeah I said the same thing.

The washer has 2 keyways on it. 1 at the mark and the other directly, 180 degrees, across.

Danny, I explained this the first time. If you reverse the washer on the camshaft, the crankshaft will turn by 360°. This is NOT his problem.

OK, Adam, back to the original post, which is clear.

I'm wondering if the balancer did shear the pins and is now, effectively, spinning on the crankshaft??

t walgamuth · #20 02-04-2006, 11:27 AM

explain it.

but if that is the problem i think, good chance that the nut would be working loose.

adam you never answered that i saw, is it running?

tom w

rg2098 · #21 02-04-2006, 12:27 PM

Runs great. I would think if the harmonic balancer is slipping I would get severe vibrations at higher RPMs, all I have is an idle shake that I believe is due to injectors. It seems to be attached fine but this is one component I'm not sure about the design of.

dannym · #22 02-04-2006, 09:01 PM

Quote:

Originally Posted by Brian Carlton

with the camshaft thrust washer being 180 degrees off........the crankshaft would be 360 degrees off..........

Your right....my bad.

Just trying to find a simple solution first.

Danny

Brian Carlton · #23 02-04-2006, 09:39 PM

Quote:

Originally Posted by dannym

Your right....my bad.

Just trying to find a simple solution first.

Danny

I know the feeling. But, this one is far from simple, unfortunately. We can bet that it did not come from the factory like this. So, it appears that the balancer is installed 180 degrees around from the proper position, or it's slipping.

One question, Adam, is the balancer exactly 180 degrees off? I realize that you can't tell just by looking. However, you can mark the balancer with chalk when the cam marks are lined up, then measure (use a piece of string) the distance from 0° to the chalk line.......then measure again from the chalk line forward to the 0° mark. Compare the two measurements and see if they are identical.

rg2098 · #24 02-04-2006, 10:53 PM

Quote:

Originally Posted by Brian Carlton

I know the feeling. But, this one is far from simple, unfortunately. We can bet that it did not come from the factory like this. So, it appears that the balancer is installed 180 degrees around from the proper position, or it's slipping.

One question, Adam, is the balancer exactly 180 degrees off? I realize that you can't tell just by looking. However, you can mark the balancer with chalk when the cam marks are lined up, then measure (use a piece of string) the distance from 0° to the chalk line.......then measure again from the chalk line forward to the 0° mark. Compare the two measurements and see if they are identical.

It appears to be very close to 180 by eye. I can't get the 300 in the garage tomorrow to pull the valve cover again (got the 250 with non running carbs and a 94 Roadmaster). It does for a fact come up at the exact same place on the crank after all 4 or 5 revolutions of the engine.

Brian Carlton · #25 02-04-2006, 11:01 PM

Quote:

Originally Posted by rg2098

It appears to be very close to 180 by eye.

Well, this mitigates the possibility of slippage. Now, the question is whether it can be "properly" installed 180° from the correct position???

t walgamuth · #26 02-04-2006, 11:55 PM

and it does appear that the hb can be installed 180 degrees off. i could have sworn i saw one posted here with the pins in a different configuration. when removing them you are supposed to mark the nose of the crank and the hb so you can put it back on in the same place.

so this may be a source of vibration on your engine, adam.

sorry for the incorrect earlier post.

tom w

rg2098 · #27 02-05-2006, 12:22 AM

Quote:

Originally Posted by t walgamuth

and it does appear that the hb can be installed 180 degrees off. i could have sworn i saw one posted here with the pins in a different configuration. when removing them you are supposed to mark the nose of the crank and the hb so you can put it back on in the same place.

so this may be a source of vibration on your engine, adam.

sorry for the incorrect earlier post.

tom w

Shouldn't I feel the vibration at high RPM as the engine is turning faster against itself?

Any word on the difficulty of reversing it back?

Brian Carlton · #28 02-05-2006, 12:26 AM

Quote:

Originally Posted by rg2098

Shouldn't I feel the vibration at high RPM as the engine is turning faster against itself?

A balancer may be installed in the wrong position and the effect on the balance of the engine can be minimal. It all depends on the original correction placed into the balancer when the engine came from the factory. If it was not too great, reversing this correction won't be objectionable to the driver........considering the other road vibrations present in the vehicle.......and considering that the engine is very well isolated from the body.

rg2098 · #29 02-05-2006, 12:39 AM

But hopefully it will help my idle maybe possibly?

Brian Carlton · #30 02-05-2006, 01:23 AM

Quote:

Originally Posted by rg2098

But hopefully it will help my idle maybe possibly?

........LOL........I think not.