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  1. #1
    Join Date
    Sep 2008
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    Hampshire
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    699

    Chassis engine mount alignment

    Hi All,
    I've installed a 350 and Getrag in prep for getting my exhausts made, but have noticed the engine sits aft right towards the driver. Have others noticed this? Is it part of the design so the prop runs straighter because the gear box out-put is pointing towards the diff in-put more than if the engine sat centrally.

    Cheers

    Fraz
    Building a Dax Tojeiro De-Dion, SBC

  2. #2
    Join Date
    May 2004
    Location
    Cowbridge, United Kingdom
    Age
    61
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    9,894
    It may well be because you don't want your propshaft running straight otherwise thre universal joints don;t work.
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
    DAX Mk4, 383 Chevy Stroker, Tremec. SOLD
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  3. #3
    Join Date
    Sep 2008
    Location
    Hampshire
    Age
    39
    Posts
    699
    But the way it is sitting the prop is running very straight because the tail of the engine-gearbox assy is sitting to the right/drivers side. Looks like thee chassis mounts are out!
    Building a Dax Tojeiro De-Dion, SBC

  4. #4
    Join Date
    Oct 2003
    Location
    Southwater, West Sussex
    Age
    42
    Posts
    10,021
    Slacken all the bolts between the mounts and the engine and the mounts and the chassis and try pulling the tail end of the gearbox over. The holes in my mounts were quite a bit oversize to allow for a bit of tolerance in the engine drilling's.
    Once the rear gearbox mount is in place it will hold itself there and you can re-tighten the front mounts.

    I believe DB does angle the engine back slightly to keep the prop straighter anyway. I positioned mine central to the chassis and don't want to change it now!

    Craig.

    Built a Dax once, Long time ago, painted it blue, original huh...?

    http://www.cobraclub.com/gallery/showgallery.php/ppuser/714/username/craggle

  5. #5
    Join Date
    May 2004
    Location
    STOKE ON TRENT, U.K.
    Age
    54
    Posts
    10,140
    The prop should be as straight as possible. This reduces/eliminates the vibration that comes with "UJ"d propshafts.
    CV joint ones don't have this problem.
    The Dax engine mounts are set so that the tail of the gearbox is directed towards the differential input shaft (Towards the drivers (R/H)side *).
    The vertical height of the gearbox is also important, but this has other issues that also need to be born in mind, like the height of the sump vs bonnet clearence and gearbox or propshaft to chassis clearence etc.
    HTH.

    * Differentials almost always have the propshaft flange offset to the drivers side, this is due to the input shaft having to run along the side of the crown wheel, to keep the diff weight to a minimal and the driveshafts equal lengths..... Unless you have the front axle off a Land Rover or such like tractor.
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  6. #6
    Join Date
    Sep 2008
    Location
    Hampshire
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    39
    Posts
    699
    OK thanks for all the replies. Ill have to check the prop to see how much clearance I get around the prop tunnel frame. I'm getting my exhausts made so need to make sure it is definitely aligned correctly. Anybody know the price difference for the CV style prop shafts?

    Cheers

    Fraz
    Building a Dax Tojeiro De-Dion, SBC

  7. #7
    Join Date
    Jan 2003
    Location
    West Sussex
    Age
    47
    Posts
    9,473
    Mine is just the same on my SR, I use a 3 inch propshaft and I have a fag paper clearance gap!
    David

    SR full rebuild, now on the road, needs paint/trim to finish
    TWM EFI 388ci 532hp/498tq
    Power steering fitted.

    IVA approved engine builder.

  8. #8
    Join Date
    Sep 2008
    Location
    Hampshire
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    39
    Posts
    699
    Yours is just the same as in the engine is offset towards the diff flange?
    Building a Dax Tojeiro De-Dion, SBC

  9. #9
    Join Date
    Jan 2003
    Location
    West Sussex
    Age
    47
    Posts
    9,473
    Quote Originally Posted by Gonch View Post
    Yours is just the same as in the engine is offset towards the diff flange?
    Yes. When I last fitted the engine I put it in the centre of the tunnel, it soon broke the gearbox rear rubber mount.
    David

    SR full rebuild, now on the road, needs paint/trim to finish
    TWM EFI 388ci 532hp/498tq
    Power steering fitted.

    IVA approved engine builder.

  10. #10
    Join Date
    Sep 2008
    Location
    Hampshire
    Age
    39
    Posts
    699
    Quote Originally Posted by Clarkson View Post
    Yes. When I last fitted the engine I put it in the centre of the tunnel, it soon broke the gearbox rear rubber mount.
    So will you grind one end and shim the other end of one of he mounts to straighten the engine?
    Building a Dax Tojeiro De-Dion, SBC

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