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   Author  Topic: 1971 399 Nordic  (Read 442 times)
775TnT
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1971 399 Nordic
« on: October 3, 2017, 06:12:10 PM »
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Well, it's getting toward that time of year. Last November I wanted have the drive axle seals replaced and a speedometer axle housing installed for upcoming summer project of dash speedometer and tachometer installation on the 1971 399 Nordic. It was recommended that the original drive cogs be replaced because of this appearance. I'm sure Bombardier never really expected plastic drivers to be operational on the machine for some 45 years.



The machine was never started after the drive cogs and seals were replaced from last November. Over the summer quite a bit of the chain lube leaked out on the garage floor in which that never happened before the axle seals were replaced.

I recently call the shop that replaced the cogs, seals and speedometer drive housing, telling them about the chain lube loss. They asked if I installed the speedometer cable. I said : "No." They said that is why the chain lube leaked out.

Does that make sense????

Here are some images of a NOS Ski Doo speedo axle housing attached to the chassis without the speedo cable attached. It is not FAULTY as seems to be written on the speedo housing. Purchased from Dale.




« Last Edit: October 4, 2017, 07:30:55 AM by 775TnT » Report to moderator Logged

1968 Sea Doo 320 (soft water Ski Doo)
1969 Ski Doo 371 Nordic
1970 Ski Doo 399 Nordic
1971 Ski Doo 399 Nordic
1972 Ski Doo 775 TnT
1966 Johnson Widetrack  (Whoops)
1971 Johnson Wide Track 30  (Whoops...again)
Joe Olympique
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Re:1971 399 Nordic
« Reply #1 on: October 3, 2017, 10:12:20 PM »
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If the speedo cable is not installed when you fill the chain case you will have oil pooling in the running board on the right side as the axle is hollow and chaincase oil feeds the right side bearing. 

If that's not the case then get your hands up inside the track and feel the oil seals. If you come away with oily fingers then the oil seals were not installed properly. It's easy enough to get them wrong. It requires a little finesse as the lip on the seal has to seat in the groove in the bearing cups. Sometimes they're not pushed in far enough, or possibly they're pushed in too far, either way you'll have and oil leak

I restored a 72 TNT, same bearing and seal configuration as your Nordic, and had an oil leak.  I pushed the left side seal in too far, could not correct it without damaging the seal. Ended up pulling the whole under carriage and redooing the entire job with a new set of oil seals.  Very discouraging but a lesson learned
« Last Edit: October 3, 2017, 11:48:12 PM by Joe Olympique » Report to moderator Logged

64: Alpine. 66 Olympique. 67 Alpine. 70: 12/3, 335. 71: 292, 775, No-dick 399, Valmont, Auto-ski Torrino 440.  72: 340, 440, 775, No-dick 440. 73: elan 250T.  75 Racoon Elan. 78 Olympique 340. 83 Yamaha Bravo
775TnT
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Re:1971 399 Nordic
« Reply #2 on: October 4, 2017, 06:01:27 AM »
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Quote from: Joe Olympique on October  3, 2017, 10:12:20 PM   

If the speedo cable is not installed when you fill the chain case you will have oil pooling in the running board on the right side as the axle is hollow and chaincase oil feeds the right side bearing.


Thank Joe for the response.

According to this picture, where on the speedo housing was the oil leaking out from?  Right where the cable housing screws into the speedo housing? There really was no evidence of it coming from there; however as you stated, there was oil on the inside of the right running board. Just curious where it was leaking from.

Also...the sled has been raised from the rear handle since parked to relieve pressure on the track.


« Last Edit: October 4, 2017, 07:34:33 AM by 775TnT » Report to moderator Logged

1968 Sea Doo 320 (soft water Ski Doo)
1969 Ski Doo 371 Nordic
1970 Ski Doo 399 Nordic
1971 Ski Doo 399 Nordic
1972 Ski Doo 775 TnT
1966 Johnson Widetrack  (Whoops)
1971 Johnson Wide Track 30  (Whoops...again)
oly_man
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Re:1971 399 Nordic
« Reply #3 on: October 15, 2017, 06:21:52 AM »
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I've had those angle drives leak on me right where they attach to the cup also.  Seemed that no matter how tight the nut was it still oozed out over time.  If that aluminum washer isn't there or in good shape it can cause issues.  Also doesn't hurt to put some thick Teflon tape on the threads either.  If it still leaks after that I would check how tight the nut is, and failing that try another angle drive. 
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775TnT
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Re:1971 399 Nordic
« Reply #4 on: October 15, 2017, 08:37:05 AM »
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Quote from: oly_man on October 15, 2017, 06:21:52 AM   

I've had those angle drives leak on me right where they attach to the cup also.  Seemed that no matter how tight the nut was it still oozed out over time.  If that aluminum washer isn't there or in good shape it can cause issues.  Also doesn't hurt to put some thick Teflon tape on the threads either.  If it still leaks after that I would check how tight the nut is, and failing that try another angle drive. 


Thanks oly_man for the response. Good idea with the Teflon tape.

The last image I posted is how it has set since last November 2016. Therefore the chain case lube somehow leaked from the speedo housing where the speedometer attaches...even though there really was no evidence of oil from the speedo housing???
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1968 Sea Doo 320 (soft water Ski Doo)
1969 Ski Doo 371 Nordic
1970 Ski Doo 399 Nordic
1971 Ski Doo 399 Nordic
1972 Ski Doo 775 TnT
1966 Johnson Widetrack  (Whoops)
1971 Johnson Wide Track 30  (Whoops...again)
oly_man
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Re:1971 399 Nordic
« Reply #5 on: October 15, 2017, 09:22:49 AM »
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Assuming the axle seals are not leaking, the it must not hold oil between the angle drive and the bearing cup threads.  Then it seeps from under the drive and drips out around the bottom of the nut.  Real hard to see.
Try putting a piece of wood under the right ski to lift that side up higher than the other side.  Pop the angle drive off and see if they put the aluminum washer in it or not.  Also the nut might not be tight?
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775TnT
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Re:1971 399 Nordic
« Reply #6 on: October 15, 2017, 11:11:52 AM »
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Great suggestion. Hopefully the aluminum washer is present after I remove the angle drive.

Thanks again and I'll report back.
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1968 Sea Doo 320 (soft water Ski Doo)
1969 Ski Doo 371 Nordic
1970 Ski Doo 399 Nordic
1971 Ski Doo 399 Nordic
1972 Ski Doo 775 TnT
1966 Johnson Widetrack  (Whoops)
1971 Johnson Wide Track 30  (Whoops...again)
775TnT
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Posts: 306



Doo'ng the Doos since the 60's

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Re:1971 399 Nordic
« Reply #7 on: July 28, 2018, 08:42:56 PM »
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Well, it's been about nine months since having had a chance to inspect for an aluminum washer within the angle drive. This is an aftermarket Arrow speedometer and the instructions don't show an aluminum washer to be installed. I did tape the threads with plumbers tape and I'll fill the chain case with 90 weight to see if she still leaks. Hope not. I'll report back hopefully before another nine months with positive results.



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1968 Sea Doo 320 (soft water Ski Doo)
1969 Ski Doo 371 Nordic
1970 Ski Doo 399 Nordic
1971 Ski Doo 399 Nordic
1972 Ski Doo 775 TnT
1966 Johnson Widetrack  (Whoops)
1971 Johnson Wide Track 30  (Whoops...again)
775TnT
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Posts: 306



Doo'ng the Doos since the 60's

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Re:1971 399 Nordic
« Reply #8 on: August 21, 2018, 02:06:53 PM »
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Quote from: oly_man on October 15, 2017, 09:22:49 AM   

Assuming the axle seals are not leaking, the it must not hold oil between the angle drive and the bearing cup threads.  Then it seeps from under the drive and drips out around the bottom of the nut.  Real hard to see.
Try putting a piece of wood under the right ski to lift that side up higher than the other side.  Pop the angle drive off and see if they put the aluminum washer in it or not.  Also the nut might not be tight?


Well it's been several weeks since using Teflon tape and tightening the speedo housing nut. Filled the chain case with 90 weight and no leakage...yet. Time will tell.

Thanks again oly_man.
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1968 Sea Doo 320 (soft water Ski Doo)
1969 Ski Doo 371 Nordic
1970 Ski Doo 399 Nordic
1971 Ski Doo 399 Nordic
1972 Ski Doo 775 TnT
1966 Johnson Widetrack  (Whoops)
1971 Johnson Wide Track 30  (Whoops...again)
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