1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

T160 lazy gearchange

Discussion in 'Triumph (Classic)' started by B+Bogus, Aug 6, 2019.

Tags:
  1. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    Freshly rebuilt T160, no discernible damage to the gearbox when I fitted it, but have to confess I wasn't looking very closely.
    If I'm just cruising it goes up the gearbox just fine, but if I'm trying to do a quick shift I sometimes miss 3rd gear.
    Similarly, on down-changes when dropping from 4th to 3rd I sometimes get a false neutral, most times it then drops into 3rd of its own accord.

    It never jumps out of gear, just sometimes doesn't like going into 3rd.

    Any ideas?
     
  2. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    On my old T160 the inner gearbox cover had not been machined correctly and was not allowing enough movement of the pedal / quadrant.

    I found it out by chance simply by noticing that it allowed more movement one way than the other, when I observed the dismantled inner cover. Trail and error filing and fitting was required, but it was quite an easy and very successful fix.

    Mine had clearly been like it all it’s life hitherto. So was obviously an original machining error. It’s therefore unlikely that mine was the only one!

    Also, due to the similarity of parts in Triumphs, parts can get miss matched. If 4 speed gearchange plungers are used in a 5 speed they also cause strange partial shifting problems. It’s not impossible that these could have been inadvertently fitted at some point down the line.

    Both are easy to check but do need the covers to come off...
     
    nortriubuell likes this.
  3. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    Thanks Eddie - certainly worth checking while I'm in there.

    I was leaning towards worn selector plungers, quadrant (particularly) and possibly camplate, as all other gears are sweet, and it's sort of logical that the most used gear would get the most wear. As it doesn't jump out of gear I don't believe the gears themselves are a problem, and if the camplate is OK I don't have to strip the primary out to get the job done - big cost & time saving.

    First plan is replace plungers & quadrant and see if that fixes things before pulling the camplate out. I presume it's not like a Norton camplate where the drive gear can be indexed around to use un-worn teeth...?
     
    nortriubuell likes this.
  4. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    If you haven’t seen this one already, you might wanna...

     
    B+Bogus likes this.
  5. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    Update...

    Pulled the gearbox and had to dismantle the primary drive to get the camplate out, which was a bit annoying :mad:
    At least it gave me an opportunity to check everything out properly. Nothing was visibly worn as such other than the usual 'used look'.
    the third gear selector fork did have a small amount of play in the camplate, but nothing out of the ordinary.
    selector quadrant and pawls all looked OK but for the price of the stuff I replaced them and the camplate.
    Unfortunately it's become apparent that the primary chain is tossed and the duplex chains are pure unobtanium, so I'm now waiting for the triplex chainwheel kit to arrive from Clive Scarfe.

    I sold my last Trident in 1988 and swore I'd never have another... I just don't learn! :rolleyes:
     
  6. Esmerela

    Esmerela VIP MEMBER

    Joined:
    Jan 9, 2017
    Hi B+

    You are not alone, I am just working through gearbox and primary drive on my t160 I have replaced layshaft second and third gear all bearings and kick start axle it was cracked :confused: I bought a starter motor from Dave Madigan, and Like you I purchased the triplex sprocket conversion from Clive, though I went with the Merc duplex chain from "Jason The Chain Man". When I opened up the primary shock absorber the cush drive rubbers, what was left of them drizzled out on to the bench. As a consequence of the lack of cush drive rubbers, the rivets holding spider and centre together rattled their appreciation at being set free. After drilling out the rivets I found that all of the holes were elongated , I bored all the holes over size and turned up rivets to suit I can't tell you how much I enjoyed whacking those rivets up tight o_O The clutch was as expected shot some clown had fitted a grey spring the thickness of which combined with a knackered plate made it close to impossible to pull. I was to say at least surprised at the price of an orange clutch spring from the usual suspects assuming you can find one with one in stock, after looking around i found a company in Oxford making classic Mini a cover plate fitted with an orange spring for £60 delivered. New Surflex friction plate and and a trip to the local bearing factors for a sealed angular bearing for the jolly old clutch pull rod to nestle up against. I measured and remeasured the the stack height before machining the clutch basket fingers I hope I have achieved the elusive flat spring required for the over centre clutch. I have turned up a clutch slave cylinder with a 38mm piston and a 12mm travelling spigot (made up name) to run the pull rod through fed by £35 worth of sh 13mm brembo master cylinder from ebay.

    Triples eh, who would have them.
     
    Last edited: Aug 14, 2019 at 5:43 AM
    B+Bogus likes this.
  7. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    Great to hear they're giving so much enjoyment to so many people ;)
    Have to say I'm relieved that the clutch on mine was in decent order and hasn't been an issue - yet... It's light enough and with the Hyde plate it works great.
    Norman Hyde did a stronger spring but having just checked he is out of stock :rolleyes:. He still has the sintered plate, but it's pricey.
    The videos from Classic Triumph have been a good source of info (as per Eddie's post above), and it's great to find there's always more to learn!

    Having said this, I'm really liking the bike now, and I have another awaiting a refresh as my Wife has rather taken a shine to it. She hated her old '68 TR6 simply because she was scared she wouldn't be able to start it if she stalled it.

    I've also noticed that Trident owners seem to be the biggest bunch of p*$$ takers on the internet! Essential to have that sense of humour :)
     
    Esmerela likes this.
  8. trident sam

    trident sam

    Joined:
    Oct 23, 2012
    Yep, Trident owners can take the piss out of ourselves. However non triple owners can't , none of them know the true meaning of misery :)
     
    B+Bogus and Fast Eddie like this.
  9. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    You can't say that on a Norton forum! :D
    I also ruled out future A65 ownership after a 90mph crank lockup on the M61 back in the '80s. Maybe I should be looking for another one of those? :eek:
     
  10. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Smoke fumes go to their heads after a while...
     
  11. trident sam

    trident sam

    Joined:
    Oct 23, 2012
    ][QUOTE="B+Bogus, post: 433497, member: 1419"ou can't say that on a Norton forum!Y :D
    I also ruled out future A65 ownership after a 90mph crank lockup on the M61 back in the '80s. Maybe I should be looking for another one of those? :eek:[/QUOTE]

    90mph ? A65 ? surely not ! :)
     
    B+Bogus and Fast Eddie like this.
  12. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    90mph ? A65 ? surely not ! :)[/QUOTE]

    And he wonders why it protested !!
     
    B+Bogus likes this.
  13. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    And he wonders why it protested !![/QUOTE]

    Ha! Yes, it only did it once :oops:
     
  14. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    Update...
    So I picked up the triplex primary kit & new thrust washers from Clive Scarfe (who was on his way to the IoM with very nice Rob North T150 in his van) and on dismantling my cush drive I found the rubbers had turned to mush after 500 miles :eek:
    One highly plausible theory is the gap between the outer tips of the vanes on the spider and the chain wheel acts like scissors and chops up the rubbers, so minimising the gap is important.
    As it turns out, my spider is a late type with longer vanes and needed skimming on the lathe to fit the new chainwheel, so it's gone from a 0.050" clearance to 0.004".
    Now waiting for a set of polyurethane rubbers from Tony Hayward.

    At least I can crack on with my 'S' Type while I'm waiting...
     
  15. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Polyurethane rubbers I got from Tony didn’t last 5 minutes.

    I’ve always stuck with rubber since.
     
  16. Onder

    Onder

    Joined:
    May 11, 2010
    Well I'm another long time 3X owner. But I'm one of those less than manly types that stuck with the T150V avoiding the weight and bother of the
    leg assistant. And in fact that I like it because it is easy to start. The easiest of my four old boat anchors at that.
    Oh, the clutch? What a heavy, stupid POS.
    There, I said it.
     

Share This Page