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Thread: Holden Conversion Clutch

  1. #1
    Join Date
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    Irymple, Victoria, Australia
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    Holden Conversion Clutch

    Here are a few pics of the clutch from my series 3 88" which failed a few days ago.
    The reason the clutch failed is due to a broken diaphragm in the pressure plate.
    The main reason I have put up to show what clutch arrangement the Holden conversion has, which may be of help to others in the future..
    Judging from the adaptor plate, I assume it is a Johnson Conversion.
    It has a standard 9.5 inch Land Rover clutch and this pressure plate is a Borg & Beck which is bolted onto a flywheel which has been made specifically for the conversion.
    The flywheel is identical to Holden red motor one with the exception of having a slightly larger diameter (about 10mm) on the face and only drilled to accept the Land Rover pressure plate.
    It weighs (give or take a few grams) the same as the standard Holden Red motor flywheel which is 11kg.
    The clutch friction plate is standard Land Rover 9.5 inch.

    Cheers, Mick
    1974 S3 88 Holden 186.
    1971 S2A 88
    1971 S2A 109 6 cyl. tray back.
    1964 S2A 88 "Starfire Four" engine!
    1972 S3 88 x 2
    1959 S2 88 ARN 111-014
    1959 S2 88 ARN 111-556
    1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
    REMLR 88
    1969 BSA Bantam B175

  2. #2
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    Quote Originally Posted by mick88 View Post
    Here are a few pics of the clutch from my series 3 88" which failed a few days ago.
    The reason the clutch failed is due to a broken diaphragm in the pressure plate.
    The main reason I have put up to show what clutch arrangement the Holden conversion has, which may be of help to others in the future..
    Judging from the adaptor plate, I assume it is a Johnson Conversion.
    It has a standard 9.5 inch Land Rover clutch and this pressure plate is a Borg & Beck which is bolted onto a flywheel which has been made specifically for the conversion.
    The flywheel is identical to Holden red motor one with the exception of having a slightly larger diameter (about 10mm) on the face and only drilled to accept the Land Rover pressure plate.
    It weighs (give or take a few grams) the same as the standard Holden Red motor flywheel which is 11kg.
    The clutch friction plate is standard Land Rover 9.5 inch.

    Cheers, Mick
    Thanks for putting this up Mick, my 186 2A clutch is just starting to slip so it's time to figure out what's in there!


    Paul

    1971 IIA ute, 186 (Betsy)

    they're not dents, they're character...


  3. #3
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    What are the options?

    I am fitting a 186 on to a series series 3 box.
    What are the clutch options?
    I expect to use a holden fly wheel redrilled to take a land rover clutch.
    Of the 3 I have got to hand.
    The one is completely new to me. It looks like the land rover adaptor has been redrilled and fitted the holden motor. It has a Lucas starter.
    The flywheel has been drilled and has a machined spacer fitted behind it. The spacer has a bronze bush in it so Im thinking this is the spigot.
    The other 2 are holden clutches. Is this a reasonable way to go?

  4. #4
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    Quote Originally Posted by grizzz View Post
    I am fitting a 186 on to a series series 3 box.
    What are the clutch options?
    I expect to use a holden fly wheel redrilled to take a land rover clutch.
    Of the 3 I have got to hand.
    The one is completely new to me. It looks like the land rover adaptor has been redrilled and fitted the holden motor. It has a Lucas starter.
    The flywheel has been drilled and has a machined spacer fitted behind it. The spacer has a bronze bush in it so Im thinking this is the spigot.
    The other 2 are holden clutches. Is this a reasonable way to go?
    The conversion you are talking about that utilises the Land Rover starter motor and a boss/adaptor between the flywheel and the Holden crankshaft is most likely a "Dellow" Conversion (I have one here), and it will most likely have an aluminium adaptor plate.
    They are a very crude looking conversion, but as they utilise the 14.5 kg Land Rover flywheel they make the Holden motor very suitable for the purpose by adding plenty of low revs torque. This will also use a standard Land Rover clutch, which is 9.5" diaphragm type on a series 3.

    The other conversion kits you have will most like have an 11kg flywheel which is the standard weight for a Holden red motor, however some kits had a purpose built flywheel, almost identical to a stock Holden one, but about 5-8mm larger in diameter across the face to accept the a slightly larger PCD of the Land Rover 9.5" diaphragm clutch pressure plate.
    If you go down this path you will need to use the "cast iron" adaptor plate (but it may be a fabricated steel one) between the motor and gearbox, as I don't think the alloy Dellow one will work, the dimensions would be wrong given it uses a spacer (adaptor/boss) between the crank and flywheel.

    Let me know if you want any pics or more info as I have both conversions kits here.

    I have attached some pics of the flywheel adaptor. Does the one you have look the same as this?

    Cheers, Mick.
    Attached Images Attached Images
    1974 S3 88 Holden 186.
    1971 S2A 88
    1971 S2A 109 6 cyl. tray back.
    1964 S2A 88 "Starfire Four" engine!
    1972 S3 88 x 2
    1959 S2 88 ARN 111-014
    1959 S2 88 ARN 111-556
    1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
    REMLR 88
    1969 BSA Bantam B175

  5. #5
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    20190126_095846.jpg20190126_095916.jpg20190126_095921.jpg
    These are the 3 major pieces I have for one clutch option.
    I know nothing about who did it and how accurate the holes are.
    The other uses the holden flywheel and clutch has a steel adaptor that looks professionally made

  6. #6
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    That is a Land Rover (2.25 or 2.6) flywheel that has been redrilled to bolt up to a Holden straight six crankshaft, and obviously as you say, the standard Land Rover alloy engine to gearbox adaptor has been redrilled. I wonder how accurate it was regarding run-out?

    The conversion that uses the LR flywheel would be the choice (providing it all runs true) as the heavier weight (3.5kg more), will be very noticeable when driving the vehicle, especially taking off, and low rpm pulling etc. Plus with this flywheel the Land Rover 9.5 inch clutch will bolt up, which is a good thing.
    If you also fit a Bosch HEI electronic distributor (from a later model blue motor) and a Bosch HEC716 coil, it will pull like the proverbial.
    A Crow Hi-Torque Cam (35613) or an EFI Cam (35678) will add further improvements.
    Good pulling power on those NZ hills.
    The Land Rover starter motor will do the job, just make sure it's in good nick, brushes, bushes, etc.
    If you are not happy with the starter there are good quality reduction starter motors for series vehicles available from Rovers North (USA), but they are pricey. STARTER MOTOR 4 & 6 PETROL HI TORQUE, PLI029, RTC5225HD | Rovers North - Land Rover Parts and Accessories Since 1979


    If you decide to go with the other conversion kit using the steel adaptor, Holden flywheel, etc, have a good look at drilling the flywheel to take the LR 9.5 inch clutch. It can be done, but the bolt holes end up very close to the edge of the flywheel.

    Cheers, Mick.
    1974 S3 88 Holden 186.
    1971 S2A 88
    1971 S2A 109 6 cyl. tray back.
    1964 S2A 88 "Starfire Four" engine!
    1972 S3 88 x 2
    1959 S2 88 ARN 111-014
    1959 S2 88 ARN 111-556
    1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
    REMLR 88
    1969 BSA Bantam B175

  7. #7
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    Irymple, Victoria, Australia
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    Here are some pics of three different adaptor plates.
    The first three are of the alloy Dellow Conversion Kit adaptor plate.
    The next is a fabricated steel adaptor plate. Possibly home made or local Garage/Mechanic.
    The last two are cast as was used by the D.R. Johnston Conversion Kits.


    Cheers, Mick.
    Attached Images Attached Images
    1974 S3 88 Holden 186.
    1971 S2A 88
    1971 S2A 109 6 cyl. tray back.
    1964 S2A 88 "Starfire Four" engine!
    1972 S3 88 x 2
    1959 S2 88 ARN 111-014
    1959 S2 88 ARN 111-556
    1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
    REMLR 88
    1969 BSA Bantam B175

  8. #8
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    Thanks Mick.
    I have reread the the pinned article on checking alignment.
    Thats the next step if I can reasonably get the LR setup aligned then thats going to be the answer.
    Second choice is trying to convince someone with a lathe to at least mark out the Holden flywheel for a LR clutch

  9. #9
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    Jan 1970
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    Grizz,
    can you please post up a couple more pics of that crank to flywheel adaptor, ie from the rear and a side view.
    How much does it actually space the flywheel from the crankshaft.

    Cheers, Mick.
    1974 S3 88 Holden 186.
    1971 S2A 88
    1971 S2A 109 6 cyl. tray back.
    1964 S2A 88 "Starfire Four" engine!
    1972 S3 88 x 2
    1959 S2 88 ARN 111-014
    1959 S2 88 ARN 111-556
    1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
    REMLR 88
    1969 BSA Bantam B175

  10. #10
    Join Date
    Oct 2016
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    Mick, thanks for the interest and information.

    20190128_094449.jpg20190128_094507.jpg20190128_094658.jpg20190128_094710.jpg
    The bush is 1" thick overall, the recess for the crank is 3/8"
    I have forgotten to measure how much has been turned out of the flywheel.
    I will add this was fitted in my Land Rover but the motor had the oil light come on at a idle when it warmed up.
    The vehicle is still getting back on the road so it has only had a few short drives on farm.
    The clutch felt ok.
    I see in the photos of the flywheel that there are oil/ grease tracks that look like cracks. They arent cracks.

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