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Thread: Type 9 Gearbox - Quiaffe HD SC CR Synchro

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    Pit Crew Decade Plus User MK1_Oz's Avatar

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    Type 9 Gearbox - Quiaffe HD SC CR Synchro

    I rebuilt my Type 9 a year or 2 ago due to the blocker bars falling out and getting mangled. Ran nicely afterwards. However, driving the car this week I noticed that 5th gear is hard to engage. I have to have 2 stabs at it and use some force to get it in. Not good at speed and 8000rpm.

    The box used to do this when I first got it but it gradually got worse before the rebuild. I have an event in November and I am nervous that there is an issue hiding in the box again!!!!!

    I don't really have the time to take it out and do another rebuild (and am not sure if it actually needs one) so I have been thinking about options;
    1. what does the 5th gear locking plate on the side of the tailhousing actually do? Might moving the plate forwards or backwards improve gear selection? The service manual I have says that moving it on later gearboxes makes a difference but offers nothing more than that.
    2. can the tailhousing be removed whilst the gearbox is on the engine?? IIRC I only need to drive out the roll pin in the selector shaft connector then unbolt the tailhousing and pull off?
    3. can I change the 5th gear synchro ring by only removing the tailhousing?
    There appears to be an issue due to the poor 5th gear shifting, I just need to find the quickest and easiest solution as I still have alot of prep work to do.......thoughts?
    1970 Mk1 Escort Tarmac Rally Car

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    You should be able to remove just the tail housing as long as the layshaft doesn't come with it ! If it does the rollers drop in the box. If you have heavy duty roller on the front of lay gear it solves that problem. If it does pull it out either way you might have trouble relocating it in the front housing again. It's worth a try. If you've had problems with this gear before change the full synchro hub instead of just the rings. Try Mark at bearing kits UK he did have some gen Ford ones. Might still have some.

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    Pit Crew Decade Plus User MK1_Oz's Avatar

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    When I rebuilt it (only 1 tarmac rally ago) 5th gear had a new synchro hub, new blocker bars, new springs and new baulk ring. The only part that was not new was the 5th gear selector fork as I could not find one and the original looked ok. It was perfect in the last tarmac rally so find it strange that it has become hard to engage after sitting doing nothing for 10 months!!!

    I have the HD roller cage bearing in the front.

    I will pull the box back out (ahhhhhhh) and pull the tailhousing off if you think I can get a good look at the 5th synchro hub/baulk rings/blocker bars by just doing that. I think it is worth the effort...
    1970 Mk1 Escort Tarmac Rally Car

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Anybody understand what the 5th gear lock plate actually does????
    1970 Mk1 Escort Tarmac Rally Car

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    Pit Crew Decade Plus User MK1_Oz's Avatar

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    hmmmm.......time to search the dark web for a decent explanation..................
    1970 Mk1 Escort Tarmac Rally Car

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Adjuting the Lock ring for the right position the finger (Lever) and the Rock.

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Quote Originally Posted by MK1_Oz View Post
    Anybody understand what the 5th gear lock plate actually does????
    It's basically controlling/setting the interlock mechanism ie it's idea is the same as the finger interlock mechanism on 1st/2nd/3rd/4th but the plate is like a fine-tuning adjustment for the 5th gear only. You could say the 5th gear plates' equivalent is the interlock "C" disc that is held in place by the main gear case lid for 1st/2nd/3rd/4th (except that one isn't tunable).

    You will find that moving it even slightly will make a difference.
    Last edited by HonkyWhiteTrash; 26-09-2018 at 07:49.

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    OK cheers. will play with it. I think my box is a later type as there is no spring inside the plate. Not sure if that makes a difference.
    1970 Mk1 Escort Tarmac Rally Car

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Quote Originally Posted by MK1_Oz View Post
    OK cheers. will play with it. I think my box is a later type as there is no spring inside the plate. Not sure if that makes a difference.
    Doesn't make any difference between early and late boxes - the 5th gear locking plate and mechanism are the same, the difference in early and late types lies in the method/action of how the gear lever is returned to neutral. The later type is a much simpler method.

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Is there a method to adjusting the plate or just suck it and see
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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Quote Originally Posted by mexicotait View Post
    Is there a method to adjusting the plate or just suck it and see
    It's pretty much "suck it and see" really.

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Partially pulled the gearbox apart today to work out why 5th is hard to engage. Turned out that the 5th gear blocker bars were mangled and the synchro ring dented and worn on the edge where the blocker bar stops against it. New blocker bars and a new synchro/baulk ring installed.

    You used to be able to buy solid blocker bars. Why are they not available any more? I don't understand how the blocker bars can get mangled but I suppose it must be from quick gear changes causing them to whack into the baulk ring that then bends them and eventually breaks them. Hence the desire for solid ones....
    1970 Mk1 Escort Tarmac Rally Car

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Someone said to me years ago that he filled the back of the blocker bars with braze to strengthen them. Never tried it myself, but it seemed a good idea!
    GavinR

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    Pit Crew Decade Plus User MK1_Oz's Avatar

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    Quote Originally Posted by GavinR View Post
    Someone said to me years ago that he filled the back of the blocker bars with braze to strengthen them. Never tried it myself, but it seemed a good idea!
    Doesn't the wire spring need to fit into and slide within the back of the blocker bar?


    I just completed a tarmac rally and the gearbox definitely needs a rebuild now! On day 3 2nd gear was hard to change down into. Got progressively worse over 30km until the synchro was totally gone. 3rd and 4th started to follow. Lots of double-declutching and I got her to the end of the event.

    Has anybody used either the steel baulk rings or the heavy duty brass ones that are available? The baulk rings/blocker bars are clearly a weak part of the gearbox and I need to do something as a rebuild every 1-2 events is too much.
    Last edited by MK1_Oz; 14-11-2018 at 02:51.
    1970 Mk1 Escort Tarmac Rally Car

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    There are 3 blockers bars on each synchro assembly and 2 wire springs, the ends of both of these are hooked into one blocker bar. So if you have solid blocker bars or ones filled with braze, I think you would need a couple of small holes drilled for the ends to go into

    Never tried the steel baulk rings or heavy duty brass ones - my solution at the time was to go to a dog box
    Now I'm back using a Quaife HD box but I do a lot less events now and I'm a bit more careful changing gear!
    GavinR

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    Pit Crew Decade Plus User MK1_Oz's Avatar

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    Re: Type 9 Gearbox - Quiaffe HD SC CR Synchro

    What annoys me was that I was slowing my changes down this event. Definitely want a dog box but never seen a 2nd hand one over here and cannot afford new.

    Nobody else used the bearingkits HD baulks?
    1970 Mk1 Escort Tarmac Rally Car

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