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Thread: Isuzu Twin Oil Filter Spacer Block

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    Isuzu Twin Oil Filter Spacer Block

    Hi,

    I have shamelessly plagiarised the attached drawing for the spacers required to install the truck style twin oil filter.

    Regards,
    Cameron
    Attached Images Attached Images
    Last edited by Bearman; 6th December 2014 at 07:52 PM. Reason: reference to group buy deleted

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    just out of interest what material are they made out of?

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    rijidij is offline ChatterBox Silver Subscriber
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    You might be aware of it, but remember the top spacer has to have a tapped hole on the side for the oil feed to the turbo, so it's not just a simple shape as in the drawing (see pic below) unless you extend the oil pipe by 60mm to remain in the original connector.

    I made the main spacer in the pic by drilling holes because it was the easiest way to do it at the time. Depending how you intend to fabricate them, it might be better to machine them to the correct shape as in the pic of the block below, especially if they're steel as this would be considerably lighter.

    Sorry to complicate things, but another method you might want to consider is laser cutting or waterjet cutting for the bottom spacer. This could be made up of 3 x 20mm plates. I would probably do them in aluminium.

    Cheers, Murray




    Original position


    This is with the top spacer fitted. You can see the original hole for the oil pipe is fitted with a brass bung.


    '88 County Isuzu 4Bd1 Turbo Intercooled, '96 Defender 130 CC VNT
    '85 Isuzu 120 Trayback, '72 SIIA SWB Diesel Soft Top
    '56 SI Ute Cab


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    Quote Originally Posted by rijidij View Post
    You might be aware of it, but remember the top spacer has to have a tapped hole on the side for the oil feed to the turbo, so it's not just a simple shape as in the drawing (see pic below) unless you extend the oil pipe by 60mm to remain in the original connector.

    I made the main spacer in the pic by drilling holes because it was the easiest way to do it at the time. Depending how you intend to fabricate them, it might be better to machine them to the correct shape as in the pic of the block below, especially if they're steel as this would be considerably lighter.

    Sorry to complicate things, but another method you might want to consider is laser cutting or waterjet cutting for the bottom spacer. This could be made up of 3 x 20mm plates. I would probably do them in aluminium.


    Cheers, Murray




    Original position


    This is with the top spacer fitted. You can see the original hole for the oil pipe is fitted with a brass bung.


    The bolded sections are very good points.

    However the first point is only relevant if you are using the OE turbo feed location???

    Bojan and I lasercut our adaptors from 12 mm steel plates. Lots of sanding then ensued against a glass sheet to make sure they were flat.

    ***An important point to note is that the thickness of the top spacer needed to be about 4 mm different between Bojan's vehicle and mine. There seem to have been some changes in the oil cooler and associated pipework over the years (and/or machining of the block face lower down). So bear that in mind - some finishing may be required!

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    Firstly thank you to Murray and isuzurover for the design tips, I guess this raises a few issues;

    - Material selection, I had assumed aluminium to keep the weight down any objections to this?

    - Bottom spacer, does anyone have any dimensions for the two profiles that need to be separated? the current drawing is not really enough to give to a shop.

    - Top spacer, I think it would be much easier to construct the block as per the diagram and to reroute the oil feed from the turbo (if installed), especially with no known dimensions for a set up similar to Murrays'.



    Regards,
    Cameron
    Last edited by Bearman; 6th December 2014 at 08:04 PM. Reason: reference to group buy deleted

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    Murray has a factory 4bd1t, so had the factory pipe to adapt to. Most on here have NA engines or ones that have been turbo'd.
    If they are already turbo'd chances are the oil feed is coming from elsewhere - likely the vac pump. If fitting the twin filters at the same time as a turbo conversion then the oil feed can be picked up from the filter housing, or alternatively the spacer could be drilled/tapped for a fitting, and hoses made to suit.
    From my perspective I'd recommend not worrying about allowing for the factory oil feed in the upper spacer. Easy enough to extend the existing pipe, and won't affect most people anyway.

    Something to note is that the NA oil pipe between housing and oil cooler (not sure about the factory turbo one) has an o-ring grooves in each flange for sealing rather than gaskets. I'm guessing Isuzu had a good reason for doing that rather than the gasket.
    If it wasn't going to add much to the cost I'd prefer the upper spacer had the same o-ring groove to seal to the oil cooler.

    What might also be of interest/value to people, is for a group buy of the longer bolts and HT threaded rod for fitting - effectively ending up with a "kit" to fit the housing. The rod in particular is quite dear - about $90/m from memory, and you don't need the whole length. Worthwhile to sort out amongst individual members if it doesn't happen on a group basis.
    If it was possible to get long enough bolts instead of using the rod would be even better.

    I've got the material here to make my own, but its a PITA job doing it by hand

    Steve
    Last edited by Bearman; 6th December 2014 at 08:05 PM. Reason: reference to group buy deleted
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

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    BTW - think I've still got a twin filter housing buried in my shed somewhere, so could dig it out and trace/scan the profile if nobody else has existing drawings etc.

    Realistically though, the bypass hole side only needs a single 12mm hole (oil flow through filter is via ~1.5mm restrictor then back into block), and on the full flow side a couple of 12mm holes would probably be enough. Think it really only needs to be a bit larger than the supply hole from the block. If the spacer material is aluminium they will be light anyway and it would turn the job into just drilling a few holes rather than milling the profile to match the housing.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

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    I've drawn some up earlier for Ben and I - will have to have a rummage through my archives to see what I can dig up.

    Regarding the material - Aluminium is a good way to go - both for weight saving, and if you have to sand it flat (the plates can warp a bit when laser cut) it hopefully won't take a whole day to do by hand.

    I traced the twin oil filter dimensions for the top mount - a word of warning, there was a slight mismatch in the bolt hole width between the N/A engine and twin oil filter. I had to widen the mounting holes on the top 3 plates in order to make the spacer fit (see below).



    To illustrate what Ben mentioned earlier - you'll notice in the above photo the front spacer is a bit thinner than the others (8mm thick vs 12 for the others). The top spacer ended up being 56mm thick while the bottom was 60mm. I understand not all engines are this way, so it may be worth while checking if the mounting faces on yours align. (BTW, I used the outlet on the twin filter housing for my turbo oil pickup).



    Also, if I was to do it again, I would make the dividing wall on the bottom spacer a bit wider than they turned out (I think they were 5mm on ours) - not the greatest photo but enough to give you an idea.



    Lastly, bear in mind there's still a bit of work once they're cut. The laser-cut edge leaves a flaky scale (visible on the outside of the first pic) that should be taken off before assembling. Come to think of it, it may be different with aluminium (and perhaps easier to remove).

    Anyway, hope that's of some use, and I'll see what I can dig up in the way of drawings.

    Cheers

    Bojan

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    Interesting that you had the hole mismatch. I had similar but figured it was due to my engine being an early Stage1 with maybe slightly different oil cooler.
    IIRC I re-made my spacer to suit the oil cooler holes, and slotted the pipe flange slightly. I may have even posted about it in my conversion thread.

    Was that twin filter assy off a genuine turbo engine? Pretty sure mine was off a 4be1 so didn't have the turbo oil feed fitting.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

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    Quote Originally Posted by Offender90 View Post
    ...

    Lastly, bear in mind there's still a bit of work once they're cut. The laser-cut edge leaves a flaky scale (visible on the outside of the first pic) that should be taken off before assembling. Come to think of it, it may be different with aluminium (and perhaps easier to remove).

    ...
    The easy way to get the scale off is using a quick dip in acid. Wish we had thought of that before we sanded it off.

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