1. Husqvarna Motorcycles Made In Sweden - About 1988 and older

74 400 Cross Engine Assembly Help?

Discussion in 'Vintage Restoration Projects' started by bul_racer, Jul 16, 2021.

  1. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    Uh... No. I can see that might cause a problem if I had the seal installed but Since I don't yet have the seal inside the flange I'm thinking it won't make a difference. You think I should remove it first?
  2. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
  3. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    Crash, I'm not sure what you mean by 'Seal getting held up at the seal journal.' I installed the seal flush with the inside of the case.
  4. Crashaholic Husqvarna
    Pro Class

    Location:
    Antelope Valley, CA.
    Husqvarna Motorcycle:
    73 450WR 6spd motor in a 75 MK frame
    I was referring to the hub on the crankshaft that the seal rides on. Its has a larger OD than the stub shaft where the bearing rides. Seeing that its bigger I thought the seal could be stopping the crank from sliding on all the way if the seal was a millimeter smaller. Just a guess at this point. :rolleyes:
    bul_racer likes this.
  5. Crashaholic Husqvarna
    Pro Class

    Location:
    Antelope Valley, CA.
    Husqvarna Motorcycle:
    73 450WR 6spd motor in a 75 MK frame
    The collar in the photo will prevent the cases from going together. It slides on the shaft after the cases are together. Also you may want to install the seal before assembling the cases in order to save from having to remove the seal retainer and then reinstall it after assembly. Its best to install the seal without the shaft present.

    Attached Files:

    bul_racer likes this.
  6. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    Gosh, I hope not. Guess I'll find out when I pull the crank back out to check it. If the seal doesn't appear mashed I'll assume that's not happening.
    Crashaholic likes this.
  7. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    OK, I don't have a problem taking the collar off until after the cases are together. Whatever I can do to make this work...
    Crashaholic likes this.
  8. Crashaholic Husqvarna
    Pro Class

    Location:
    Antelope Valley, CA.
    Husqvarna Motorcycle:
    73 450WR 6spd motor in a 75 MK frame
    Also, referring to the pic in my post #25, the gear on top of the clutch shaft is suppose to be level with the gear on top of the countershaft. Is there something underneath it thats keeping it from sitting level with the countershaft gear?

    Attached Files:

    bul_racer likes this.
  9. motomwo Husqvarna
    AA Class

    Location:
    Imbler Oregon
    Husqvarna Motorcycle:
    Many vintage big bore and automatics
    Yep, that is what I meant to say. Right side. Sorry.

    Marty
    bul_racer likes this.
  10. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    Not sure why it looks to be setting above but I just checked it and this is OK.
    Crashaholic likes this.
  11. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    No worries! I appreciate your contribution.
  12. DeathFromAbove My Cat Says AREAR!

    Location:
    North New Jersey
    Husqvarna Motorcycle:
    70,71 360 8s 72,74 450 73 360 73 250
    Other Motorcycles:
    66 Triumph Trophy 99 ZRX1100
    Yeah, that aint right.

    Attached Files:

    bul_racer likes this.
  13. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    OK, Removed it.
  14. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    Pulled crank from left case & examined the seal there. Do not see any damage. Manual shows the edge as flush with inside of the case so assuming the seal is not causing any interference to prevent crank from going into position.
  15. DeathFromAbove My Cat Says AREAR!

    Location:
    North New Jersey
    Husqvarna Motorcycle:
    70,71 360 8s 72,74 450 73 360 73 250
    Other Motorcycles:
    66 Triumph Trophy 99 ZRX1100
    You got good eyes crash!!:p
    Is l the left seal pointing out board?:thumbsup:
    bul_racer likes this.
  16. DeathFromAbove My Cat Says AREAR!

    Location:
    North New Jersey
    Husqvarna Motorcycle:
    70,71 360 8s 72,74 450 73 360 73 250
    Other Motorcycles:
    66 Triumph Trophy 99 ZRX1100
    The gear and spline should be flat.

    Attached Files:

    bul_racer likes this.
  17. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    Smooth side facing inward as per manual.

    Husky Left Seal.JPG
    Crashaholic likes this.
  18. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    thr

    They are flat. Can't take a picture of it now bc I taped up the transmission so the crank could be removed without having gears falling all over the place. Question: How'd you get those gears so sparkling clean? I cleaned mine pretty good but your stuff looks new.
  19. DeathFromAbove My Cat Says AREAR!

    Location:
    North New Jersey
    Husqvarna Motorcycle:
    70,71 360 8s 72,74 450 73 360 73 250
    Other Motorcycles:
    66 Triumph Trophy 99 ZRX1100
    Just the lighting. Hoping your finding the problem. Chris
    bul_racer likes this.
  20. bul_racer Husqvarna
    A Class

    Location:
    Evergreen, Colorado
    Husqvarna Motorcycle:
    1974 400CR, 1975 400WR
    Other Motorcycles:
    KTM, Honda, Bultaco, Yamaha
    Here's the picture of the flat gear/spline:

    HuskyGears.jpg

    Was concerned that all this torquing might affect crank truing so I removed it and put it on my home made truing jig to check. All was OK though.

    Truing Jig.jpg

    I put the crank back into the left case, then the right. When I got it all cranked down pretty good I noticed that it still was not drawing the cases together enough to remove the gap, esp. in the front. Decided to check the manual for the length of the 2 Allen screws that come from the left side & found that I'd been using 50mm screws where it calls for 40mm. Switched those out and, behold! Problem eliminated!

    However, I am still concerned about the space between the crank wheels and cases. This time instead of too much space I am concerned that it might be too little. I think it was Crash that said it should be 2mm, which amounts to about .0079 inch. I'm getting only about .0020 on the ignition side and about .0045 on the clutch side. My first thought was to put the case puller back on and crank it carefully until it moves to the desired spec but then I realized that wouldn't work because it would just split the cases. The crank does spin freely and I do not hear any rubbing on the cases.

    What do you think? Do I have a problem here? If so, suggestions please for correcting it...

    Husky Crank.jpg