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Thread: Removing wiper wheel box - advice please!

  1. #1 Removing wiper wheel box - advice please! 
    Club Member
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    I would appreciate some advice. One of the wiper wheel boxes on my Roadster has seized and needs replacement.

    Q1. I've managed to remove the back plate and it's clearly stamped 72781A. Can anyone identify this and/or tell me of a direct equivalent that's currently available?

    Q2. Please see the attached image. This is the offside of the car with the wiper motor removed and the first section of tubing disconnected from the wheel box. The problem is that the wheel boxes have obviously been fixed to the screen base clamp before this was fitted to the scuttle (they don't go through the scuttle as shown in the Marlin 'build manual'), and I can therefore see no alternative except to remove the base clamp to change the wheel box. The base clamp is fixed with five bolts (you can see two of them in the photo). I propose removing the bolts, then knifing the sealant between the windscreen and the base clamp, hoping this will allow me to remove the base clamp whilst leaving the screen undisturbed. Does this make sense? Has anyone else had to do this? Has anyone got any better ideas?

    Q3. Assuming the above works ... what type of sealant should I use when re-fixing the base clamp? The current sealant looks like butyl rubber rather than silicone so I propose to replace like-for-like. Any comments?

    All advice welcomed. Thank You!
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  2. #2 Re: Removing wiper wheel box - advice please! 
    Moderator Club Member
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    I used Allegro wheel boxes on my first Roadster as they gave greater sweep {think they were 32 teeth ] as opposed to the Marina which were 40. Hope my memory is as good as I think! I also seem to recall a member using MGB wheel boxes but don't know any further info on those.
    I got mine from a scrap Allegro, so probably no chance there, but SVC I would think may have something suitable.
    The Allegro items were also the correct length.
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  3. #3 Re: Removing wiper wheel box - advice please! 
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    Should also add I fitted as per the manual - so through the scuttle.
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  4. #4 Re: Removing wiper wheel box - advice please! 
    club member Club Member jon_wilkinson's Avatar
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    CBS have various wiper wheelboxes https://www.carbuilder.com/uk/wiper-...rid&orderBy=15.

    Mine are fitted as per the manual and I would expect yours should be too.
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  5. #5 Re: Removing wiper wheel box - advice please! 
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    Gentlemen. Thanks for your help so far. I'm fully aware of the wheel boxes supplied by SVC, Holden, Car Builder, etc. The problem is that none of them, as far as I can see, reference an equivalent to 72781A. I have emails in to SVC and Rimmer Bros, and am awaiting replies.
    Last edited by AndrewKB; 02-07-2021 at 07:59 AM.
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  6. #6 Re: Removing wiper wheel box - advice please! 
    club member Club Member listerjp2's Avatar
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    Hi

    I changed mine on the second build.

    I asked myself, how often did I use the glove box?

    Never was my answer and so I ended up putting the wiper motor behind the dash.

    Meant it took the curve out from scuttle and relieved the space in the engine compartment.

    1573831683508.jpg
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  7. #7 Re: Removing wiper wheel box - advice please! 
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    Quote Originally Posted by listerjp2 View Post
    Hi

    I changed mine on the second build.

    I asked myself, how often did I use the glove box?

    Never was my answer and so I ended up putting the wiper motor behind the dash.

    Meant it took the curve out from scuttle and relieved the space in the engine compartment.

    1573831683508.jpg
    All noted, but I am trying to keep my current installation (which is all in front of the scuttle). All I want to do is to replace one wheel box!! Who'd have thought it could be such a problem? ;-)
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  8. #8 Re: Removing wiper wheel box - advice please! 
    club member Club Member lil_red_roadster's Avatar
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    Some on eBay, here.
    Item #373449176559
    Marlin Roadster, LWB...1860 B Series + Ford Type 9
    Renault Espace 54mm front calipers, vented discs, cycle wings and adjustable tie-bars.
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  9. #9 Re: Removing wiper wheel box - advice please! 
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    Quote Originally Posted by lil_red_roadster View Post
    Some on eBay, here.
    Item #373449176559
    Brilliant! Thank You! Bought! (But can't understand why I couldn't find them when I trawled eBay).

    Now I just need any advice on removing the screen base clamp ...
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  10. #10 Re: Removing wiper wheel box - advice please! 
    club member Club Member lil_red_roadster's Avatar
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    Quote Originally Posted by AndrewKB View Post
    Brilliant! Thank You! Bought! (But can't understand why I couldn't find them when I trawled eBay).

    Now I just need any advice on removing the screen base clamp ...
    Having changed a couple of screens then the only way is as you describe...knife through the sealer, remove bolts and carefully separate the clamp. The sealer always goes further than you expect so separating the pieces can be a tense affair..!
    Marlin Roadster, LWB...1860 B Series + Ford Type 9
    Renault Espace 54mm front calipers, vented discs, cycle wings and adjustable tie-bars.
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