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tranny seal replacement

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mbskeam
Posts: 1004
Joined: Tue Mar 16, 2004 5:52 am
Location: Sultan, WASH
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tranny seal replacement

#1

Post by mbskeam » Fri May 22, 2009 4:21 am

my tranny started leakin last summer.....
but when you mix belts and oil you get this....
DSC_0002.jpg
BUSTED
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when I took out the old seal I found the side to side play on the MGD gear to be about .0035,
what I found was that .0004/.01254 over size bearings where a plug fit, I was about to put in the old bearings when I remembered that I had new STD size/.1250,
so I measure new VS the old and the old were .0002 smaller/.1248
plus the gap at the top of the 44 bearings went from .023 down to .011....
and all my up/down was gone....
.0002 may not seam like a lot, but times that by 44 and it adds up .0088
now keep in mind that this is a circle so it gets kinda hard for me to explain were all of the .0088 went, but it spins free and I checked my old numbers that I had measured out before, and I know I check these bearings when I rebuilt it 20,000 miles ago and they were right at .1250...

kinda a mystery to me.......
DSC_0028.jpg
DSC_0029.jpg
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good puller
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the offender
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seal out
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new seal and hat
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new cork
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seal driver
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seal .050 deep
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clutch hub stud tool
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weapons of choice
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this tool has a shoulder bored into it so that the stud rests on it.this is to set the correct height of the stud
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peen over
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for the stubborn stud
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clean with lacquer thinner
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clean out old lock tight
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feeler gauge to keep seal from getting cut
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SILLY CONE
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dish in
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MORE SILLY CONE
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red locktight
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checking alignment
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RIGHT ON!!
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close
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red locktight, your friend
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less than .002 run out
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less than .005 run out
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belt drive in line and square
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flat and no rock
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nylatron liner
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new springs, no more slip I hope.....
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5/8 cold up and down free play
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Last edited by mbskeam on Wed May 27, 2009 5:02 am, edited 7 times in total.



lockdoc
Posts: 118
Joined: Mon Apr 02, 2007 1:08 am
Bikes: 65 Panhead in a 70 FLH frame
Location: Northeast PA, USA

Re: tranny seal replacement

#2

Post by lockdoc » Sat May 23, 2009 4:19 am

Nice pictorial! Where were you a couple years ago?

Now clean up the rest of the tranny!

Panacea
Posts: 1857
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

Re: tranny seal replacement

#3

Post by Panacea » Sun May 24, 2009 3:08 pm

Nice seal pounder, Home made? I see you have the MDG with the built in seal at the main shaft. I still don't see how the oil is supposed to stay inside the tranny with no seal between the MDG and the tophat (spacer), the only real solution (at least when parked) is keep the oil level low enough so it can't run out the side...Mike

mbskeam
Posts: 1004
Joined: Tue Mar 16, 2004 5:52 am
Location: Sultan, WASH
Contact:

Re: tranny seal replacement

#4

Post by mbskeam » Sun May 24, 2009 5:38 pm

silicone sealer....

socalrider
Posts: 321
Joined: Sat Jun 14, 2008 5:22 am

Re: tranny seal replacement

#5

Post by socalrider » Sun May 24, 2009 11:05 pm

panacea,
i got the same problem of oil leaking out between the top hat and main drive gear. dont see how silicone would help where would i put it? the mdg in my tranny does not lock to the top hat with that "L"shaped piece.it only leaks when parked ,on kick stand. the tranny is a 1978 shovel.
arnulfo,
L.A. CALIF.






/

VT

Re: tranny seal replacement

#6

Post by VT » Mon May 25, 2009 1:30 am

The 4-spd trans was engineered to still have enough oil in it, even if, on it's jiffy stand, the MDG seal leaks down to the crown weir (tipping point) over the case race. They made those cases for like, I dunno... 1936 to.... uhhh....1964. Harley had MDG seal leak problems for 28 yrs. During those 28 yrs., if the dealers complained about transmissions running dry and galling up, then H-D had a whole building floor devoted to engineering out problems. By 1958 their OHV motor was perfected. I think the last "new" part to go in a 4-sped transmission was....uh....like 1941 :!:
As long as you can see oil at the bottom of the case, with the bike upright, you're ok.
Looks like a 2" dia. pvc square cut pipe. Saw it illustrated in Vol. 2 :!: 8) Good to see it in practice. Looks like Hylomar® sealant. Clear-blue. The good stuff.
0.050" on the seal inset? JIMS has a tool for that, but vernier calipers will set the depth too. The metal seal edge makes contact (and an indent) into the cork seal.
Nothing like a Panhead.

RUBONE
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Re: tranny seal replacement

#7

Post by RUBONE » Mon May 25, 2009 2:58 am

VT
What about the -59 third gear update?
Robbie

VT

Re: tranny seal replacement

#8

Post by VT » Mon May 25, 2009 3:00 am

Dunno. Whatup? Right, right, right.....the 1959 3rd gear and the neutral lamp switch. Still, they got the box wired for low oil by 1941. Let it bleed until it stops, then keep riding it. 8)

Panacea
Posts: 1857
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

Re: tranny seal replacement

#9

Post by Panacea » Mon May 25, 2009 4:30 am

I guess I could use some sillycone on the drive gear/spacer since they are locked together with the "L" key, still wish I had the lip seal on the mainshaft...Mike

LittleAl
Posts: 263
Joined: Fri Jan 02, 2009 8:52 pm
Bikes: 1954 FL Panhead
1976 Sporty
1983 FXRT Shovelhead
2000 FLHT TC
2008 Anniversary Ultra
Location: New York City

Re: tranny seal replacement

#10

Post by LittleAl » Mon May 25, 2009 3:02 pm

good series, I'm gona keep this thread for when I have to do the same

VT

Re: tranny seal replacement

#11

Post by VT » Mon May 25, 2009 3:07 pm

I just wish erry' body would size their pics to 640 x 480.....it takes about 5 minutes for the screen to quit jumping around as these huge pics develop......blah, blah, blah......(whine some more)....blah, blah, blah.

Panacea
Posts: 1857
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

Re: tranny seal replacement

#12

Post by Panacea » Mon May 25, 2009 3:29 pm

The pics worked great on my dinosaur computer, Thanks for taking the time to document a very thourough seal job!... Mike

cory
Posts: 19
Joined: Mon Dec 03, 2007 9:38 am

Re: tranny seal replacement

#13

Post by cory » Wed May 27, 2009 1:05 am

Great picture tutorial! The home made tools are awesome!
One thing I noticed it looks like you didn't grease the roller bearings? Maybe it's the pics, but they look kinda dry? Aren't you supposed to grease 'em up real good?

mbskeam
Posts: 1004
Joined: Tue Mar 16, 2004 5:52 am
Location: Sultan, WASH
Contact:

Re: tranny seal replacement

#14

Post by mbskeam » Wed May 27, 2009 1:11 am

yes I put a small amount of grease on them, but did not get a pic as grease and my camera dont mix....LOL

Panacea
Posts: 1857
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

Re: tranny seal replacement

#15

Post by Panacea » Wed May 27, 2009 2:05 am

Mbskeam, what did you do with the special hub stud tool? pull and replace bad ones? Mike

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