Funny noise from Mainshaft MDG

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1964FLDUO
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Funny noise from Mainshaft MDG

#1

Post by 1964FLDUO » Thu Mar 01, 2012 11:31 pm

I reassembled my mainshaft after completely going through my transmission, as some of you may know if you followed my other thread. Like i said in the title it is making a pulsing noise like a vibration as I turn it, you can feel it while turning the MDG. If you only turn the mainshaft with the MDG disengaged it makes no noise, but when you engage the MDG and turn it it makes the noise, kind of like brrrrrpt. Is this normal? And yes I am sure all of the rollers are in there. The mainshaft is also significantly more difficult to turn when the MDG is engaged. Nothing is lubed yet other than a littl grease. I think it is just the rollers, but I wanted a second opinion before I do something drastic like pulling it apart!

Also, what weight oil are most guys running? I was running a 20w-50 synthetic in both my engine and tranny before the rebuild.



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Re: Funny noise from Mainshaft MDG

#2

Post by 1950Panhead » Fri Mar 02, 2012 12:41 am

Not normal, here are some things to check:
1) Check that inner thrust washer is in place
2) Verify main gear spacer is in place, I usually install a sproket and finger tighten nut when bench testing.
3) Look for defects on the gear bearing surface.
4) Look for defects on the bearing race.
5) Check the od of all the rollers, sometimes they get mixed up (different sizes).

Panheads use straight 60 weight in engine and gear box.
Jerry

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Re: Funny noise from Mainshaft MDG

#3

Post by 1964FLDUO » Fri Mar 02, 2012 2:30 am

Damn apart it goes again!

Thrust washer is in place

Spacer is in place

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Re: Funny noise from Mainshaft MDG

#4

Post by Bosheff » Fri Mar 02, 2012 4:49 am

Start by removing the countershaft and its gears. You now have a tranny minus the countershaft setup. Rotate the MDG. Ya still got the noise? You have eliminated the countershaft so you can pretty much figure that it was not part of the problem if the noise persists. Now remove the mainshaft and all related parts leaving the MDG in place. Rotate the MDG. Still got the noise? At this point you have eliminated everything but the MDG. If the noise persists it's gotta be in the MDG setup. Process of elimination....bosheff

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Re: Funny noise from Mainshaft MDG

#5

Post by Panacea » Fri Mar 02, 2012 5:10 am

Did you check the endplay?

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Re: Funny noise from Mainshaft MDG

#6

Post by 1964FLDUO » Fri Mar 02, 2012 5:21 am

Bosheff wrote:Start by removing the countershaft and its gears. You now have a tranny minus the countershaft setup. Rotate the MDG. Ya still got the noise? You have eliminated the countershaft so you can pretty much figure that it was not part of the problem if the noise persists. Now remove the mainshaft and all related parts leaving the MDG in place. Rotate the MDG. Still got the noise? At this point you have eliminated everything but the MDG. If the noise persists it's gotta be in the MDG setup. Process of elimination....bosheff

Havent put the countershaft in yet, I have removed the mainshaft and turned the MDG an still feel the pulse. So it was definitely in the MDG. I checked to see if any rollers were missing, all 44 were present. Am I wrong in thinking the MDG should be smooth when rotated? I will check the roller fit tomorrow, to make sure they arent too small.

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Re: Funny noise from Mainshaft MDG

#7

Post by 1964FLDUO » Fri Mar 02, 2012 5:21 am

Panacea wrote:Did you check the endplay?
Endplay was sufficient I will double check.

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Re: Funny noise from Mainshaft MDG

#8

Post by Bosheff » Fri Mar 02, 2012 5:53 am

When rotating the MDG it should roll and feel as smooth as a new ball bearing that supports the other end of the mainshaft....bosheff

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Re: Funny noise from Mainshaft MDG

#9

Post by Hauula Pan » Fri Mar 02, 2012 7:12 pm

Sound like you've got some pits either in the inside of the drive gear or on the rollers or a combination of the two, if all the rollers are there & the proper size.

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Re: Funny noise from Mainshaft MDG

#10

Post by Cotten » Fri Mar 02, 2012 8:57 pm

1964FLDUO!

After you scrub everything, try using petrolatum instead of grease for reassembly.

Not only does it easily show any foreign particles that grease hides so well, it will quickly allow oil in to do its job.

Beware especially of disc brake compatible greases that do not melt, nor mix well with oil.

In fact, its hard to find good common grease these days.

....Cotten

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Re: Funny noise from Mainshaft MDG

#11

Post by Panhead Ed » Sat Mar 03, 2012 12:48 am

You should have assembly lube right in your medicine cabinet ... good old fashion VASALINE PETROLIUM JELLY ! been using it for years especially on HD transmissions , holds all them brg. rollers in place ! works great ,melts off quickly .... use for assmbly only ,not as a gear lube. use your regular 60wt HD oil as prescribed !! ED

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Re: Funny noise from Mainshaft MDG

#12

Post by 1964FLDUO » Sat Mar 03, 2012 2:14 am

Found the problem-I think. The bearings are only making the noise while the thrust washer is on the MDG. I checked for burrs on the races or thrust washer. I also noticed with all 44 rollers in the race, there is a .040" gap which is about 1/3 of a roller. Should I consider oversized rollers?

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Re: Funny noise from Mainshaft MDG

#13

Post by 1964FLDUO » Sat Mar 03, 2012 4:21 am

I check the the roller fit and found the following:
The MDG bearing race ID: 1.8800"
MDG Journal OD: 1.6270"
Roller OD: 0.1235"

1.8800 - 1.6270 = 0.2530

0.2530 - .0005 = 0.2525
The minimum clearance is .0005" per the manual

0.2530 - .002 = 0.251
The maximum clearence is .002" per the manual

0.2525 / 2 = 0.12625"

0.251 / 2 = 0.1255"

Roller size to meet minimum clearance specs of .0005" : 0.12625"

Roller size to me maximum clearance specs of .002" : 0.1255"

It seems I need oversized rollers

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Re: Funny noise from Mainshaft MDG

#14

Post by caschnd1 » Sat Mar 03, 2012 4:23 am

That's a huge amount of play. Either the MDG or the race is very worn (or both). I don't think you'll find oversized bearings to take up that much wear.

EDIT: Actually you can get oversized bearings to 0.126" so you may be ok.

-Craig
Last edited by caschnd1 on Sat Mar 03, 2012 4:32 am, edited 1 time in total.

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Re: Funny noise from Mainshaft MDG

#15

Post by 1964FLDUO » Sat Mar 03, 2012 4:25 am

Based upon my specs can you tell me what a fresh race and MDG journal would be at, I will replace whatever needs replacing.

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