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Turbo Engine rebuild 20HC85

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  • Turbo Engine rebuild 20HC85

    Hello, After many years looking for a turbo engine in Spain, I finally found one from scrapping but when I disassembled it I found that it needed an almost complete reconstruction.
    The engine has this reference: 20HC85

    I removed the connecting rod bushings and it has a coppery color and the piston rings have a lot of gap.
    Where can I find compression and oil piston rings and connecting rod bushings?

    Another question I have is how can I know if the cylinders are in tolerance? What measures should I take?

    I have a 1992 carb engine and a 1993 efi engine, the EFI engine is in very good condition and I will use some parts if I can't find new ones.
    Is the crankshaft the same on all engines? the one on the turbo model has some worrying marks.

    I have a thousand more doubts which I am investigating little by little and I will comment in this post those that I am not able to solve by myself.

    Any advice and help is welcome, thank you very much
    Attached Files

  • #2
    Pistons, con rods etc are obviously different but piston rings are the same as an efi if standard BHM1531, main bearings are the same BHM1153, Trust washer again the same BHM1295, Con rod Bearing is BHM1505. Carb, efi and turbo engine blocks are the same, the only difference with a turbo engine is the return hole for the turbo drain. I got mine moved from the original engine put into an carb block. Rimmers did have standard piston rings on their website. I was lucky in buying an unused carb engine with new bearings in it and used those.
    Although the conrod bearings have a different part number they were exactly the same as the carb ones after I had measured them. With your tolerances it would all depend on what needs to be done or if you're swopping things and how much is worn out.
    Crank has a different part number for a turbo but the part number is only listing a set including bearings and dowel and not only the crank. Part number for the crank set is BHM1584 superceded by LFT10007, efi and carb is BHM1583/LFT10006.
    Again I used the existing carb crank after measuring it as it was the same as the turbo crank, i'm guessing the part number difference is the con rod number being different to an efi/carb.
    As always check first before buying but Piston rings at std https://rimmerbros.com/Item--i-BHM1531

    bearings are showing for a Rover 200 etc so check first https://www.bing.com/aclk? ld=e82H3q7...e28fa7f54706fe
    in turkey https://www.ebay.co.uk/itm/313950474...Cclp%3A2047675

    Rimmers have standard and plus 10 in bearings BHM1153 and BHM115310 if you put those into their website
    Last edited by Jeff Turbo; 27th July 2022, 11:21.
    1958 Ford Consul Convertible. I love this car
    1965 Ford Zodiac Executive. Fab cruiser
    1984 MG Montego EFi in black. Digital dash, nearer completion
    1997 Jaguar Xk8 Convertible. Such a fab car
    2004 MGZT cdti. Great workhorse
    2004 MGZT V8. I love this car

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    • #3
      I have a new set of rings if needed

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      • #4
        Hi,

        Thanks Jeff for the information.
        With the engine completely disassembled and cleaned I took it to a machining workshop to check the tolerances and they asked me what the engine code is, I told them it is 20HC85 but in my workshop manual there are only references 20HF50 20H and 20HE15. Does anyone know what engine my engine code refers to?

        Thanks for the help.

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        • #5
          Originally posted by Juanmacandel View Post
          Hi,

          Thanks Jeff for the information.
          With the engine completely disassembled and cleaned I took it to a machining workshop to check the tolerances and they asked me what the engine code is, I told them it is 20HC85 but in my workshop manual there are only references 20HF50 20H and 20HE15. Does anyone know what engine my engine code refers to?

          Thanks for the help.
          The later letters are later years engines. 20HA is a very early type engine that was re-worked and called 20HB. 20HC is about 1985-87, 20HE is 1989ish and would be the type that moved the oil way. The tolerances are not affected. 20 means 2 litre overhead cam. Your engine should have the number on the top of the block facing the front.
          1958 Ford Consul Convertible. I love this car
          1965 Ford Zodiac Executive. Fab cruiser
          1984 MG Montego EFi in black. Digital dash, nearer completion
          1997 Jaguar Xk8 Convertible. Such a fab car
          2004 MGZT cdti. Great workhorse
          2004 MGZT V8. I love this car

          Comment


          • #6
            Hi everyone and thanks Jeff,

            Today I received a call from the machining workshop,
            Apparently the engine needs a new crankshaft as it has a crack and +0.1mm oversized pistons and rings. Connection rods are fine.

            Is there any way to get +0.1 pistons and rings?

            The crankshafts are the same if I'm not mistaken in efi and carb models.

            I am considering the possibility of sending my engine carb to see if it is in tolerance.

            thanks

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