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TOPIC: Pri Drive Gear will not align with the clutch pack gear

Pri Drive Gear will not align with the clutch pack gear 01 Dec 2018 16:34 #1

  • rcpppr
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I am re-assembling my engine for my 73 CT3 175 and I cannot get the Pri drive gear to sit low enough to align with the clutch pack gear. The only reason I can think if is that my oil seal is too high up.

I installed the oil seal, then O-ring then collar. when I install the gear, it is too high to place the nut on it. Suggestions would be appreciated.

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Pri Drive Gear will not align with the clutch pack gear 01 Dec 2018 18:53 #2

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The o-ring fits in a groove in the crankshaft, right?

The collar has to slide over the o-ring and into the crank seal until it bottoms on the crank bearing. If you have the right o-ring in the groove properly, make sure you put a little oil on it and make sure it's all the way down.

Posting a picture would help a lot.

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Pri Drive Gear will not align with the clutch pack gear 01 Dec 2018 19:26 #3

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If I am not mistaken, the o-ring is thin. You will not get the bushing over a "fat" o-ring. John
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Pri Drive Gear will not align with the clutch pack gear 01 Dec 2018 19:28 #4

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Yes as above. but if all else fails try a bigger hammer. No ignore that--that's what i'd do. Realy nothing other than the Oring that can hold it up. Number 18. Spacer should be a nice snug fit over it maybe a little help & oil on Oring. www.partzilla.com/catalog/yamaha/motorcy...973/ct3/crank-piston . just thinking--is the Oring in the groove halfway down or sitting in first against the bearing like it does on 250 & 360. Should be in the groove in your case.

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Pri Drive Gear will not align with the clutch pack gear 01 Dec 2018 20:46 #5

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Okay I will take some pictures. The o ring isn't holding the collar up. The collar fits over the o-ring but does not go into the oil seal. That must be my problem. I did not try to make it go through the oil seal. I will try that tomorrow morning.
Thanks,

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Pri Drive Gear will not align with the clutch pack gear 02 Dec 2018 17:27 #6

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Is the oil seal in the correct way? Correct size? John

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Pri Drive Gear will not align with the clutch pack gear 05 Dec 2018 17:59 #7

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Okay thanks to you guys I think I know the problem. The collar is sitting on top of the oil seal, not in contact with the bearing. I tried to get the collar to slide inside the oil seal but had not luck. I do not think I can get the oil seal out without ruining it. I thought if I could get it out, I could slide the collar on first, then place the oil seal over it.
I am looking for suggestions please.
Thanks

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Pri Drive Gear will not align with the clutch pack gear 05 Dec 2018 19:00 #8

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shouldnt be that tight to slide through. is a double lipped seal and you may need to assist it into the first lip but should sail through the inner one relatively easily. have you got the wrong seal, by memory should be 25-40-8 hang on is that the mag side, 28-40-8 then on right side--been 40 years lol. sorry one finger typing while eating. pic or two would be good but should be an obvious fault there. hope ya get onto it ok. cheers.

Edit, just had another silly random thought. you've not accidentaly grabbed the wrong spacer like the one behind the sprocket or the spacer through the clutch. number 17 in the clutch or number 27 behind the sprocket. 19 being the one you want in the crank pic link.
www.partzilla.com/catalog/yamaha/motorcycle/1973/ct3/clutch
www.partzilla.com/catalog/yamaha/motorcy...973/ct3/transmission
www.partzilla.com/catalog/yamaha/motorcy...973/ct3/crank-piston
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Last Edit: by RT325.

Pri Drive Gear will not align with the clutch pack gear 05 Dec 2018 21:04 #9

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Yes, what RT325 said... should not be that hard to install. Might be the wrong seal? (or maybe wrong spacer?)

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Pri Drive Gear will not align with the clutch pack gear 06 Dec 2018 09:22 #10

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try any vasoline? works wonders in tight situations :)

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1970 DT1-C Grand Prix race bike
1970 DT1-C Dirt bike
1968 Honda CL90
1971 Honda Sl 125
1973 Honda CR250
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1966 Triumph Tiger Cub
1967 Moto Guzzi V700
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