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Alfa 1750 alfetta

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  • Alfa 1750 alfetta

    Information about the 1750 engine can be found here.

  • #2
    Re: Alfa 1750 alfetta

    Think its the Fuel injection manual only Cameron ??

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    • #3
      Re: Alfa 1750 alfetta

      here's the duetto engine link. hth

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      • #4
        Re: Alfa 1750 alfetta

        Very helpful document, do you have one for the 1750 (this is for the1600) as some of the torque values / clearances will be different. I am the process of repairing this very engine and I do have a manual but it's always hand to double / treble check values.

        Thanks

        Derek
        Stumbling around in the dark
        Marina based SWB roadster
        Alfa Romeo 1750 with 5 speed box

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        • #5
          Re: Alfa 1750 alfetta

          Hi Derek, I found this...

          alfa_torque_chart.pdf

          and some more detials here... http://www.international-auto.com/al...ifications.cfm
          Last edited by cameronfurnival; 23-04-15, 10:37 AM.

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          • #6
            Re: Alfa 1750 alfetta

            Thanks for these. Saved to favourites. The head scratching and plodding progress will continue,picked a few bones out of the 1600 doc that were not mentioned in my manual. All new ground for me :O)
            Last edited by Blue Marlin; 23-04-15, 12:36 PM. Reason: Missing text
            Stumbling around in the dark
            Marina based SWB roadster
            Alfa Romeo 1750 with 5 speed box

            Comment


            • #7
              Re: Alfa 1750 alfetta

              One little tip that may apply to the 1750 engine is to seal the rear crankshaft oil seal to the housing to prevent oil leaking past. I only found out about this after I had re-built my 2 litre Alfetta GTV engine. The only good thing about the resultant oil leak is that the entire underside of the Roadster aft of the engine is covered in oil so corrosion should not be a problem.

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              • #8
                Re: Alfa 1750 alfetta

                Good call, there is a fair bit of old sludgy oil in the bellhousing. Will seal seal!

                Did you rebuild the engine out of choice or necessity? I am the latter which is making a large dent in my meager refurb budget.

                I have lost compession compression in cylinders 1+2, removed head / skimmed,new gasket, same result . Engine now on stand in garage partially stripped but still no obvious cause :O(
                Stumbling around in the dark
                Marina based SWB roadster
                Alfa Romeo 1750 with 5 speed box

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                • #9
                  Re: Alfa 1750 alfetta

                  I re-built mine because it was a complete unknown quantity when I picked it up about 20 years ago now. Regarding loss of compression worth checking valves are seating ok before removing pistons and checking for ring or bore damage. I seem to remember having to replace one cylinder liner, piston and rings on mine.

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                  • #10
                    Re: Alfa 1750 alfetta

                    Valves are good as they were checked, re-ground then vacuum tested by the engineering shop that skimmed the head.

                    Pistons are out and all looks ok.

                    What did you use to remove the liner as after 40 years they look to be jammed solid? I have seen pictures of the official removal tool but this seems to be like hens teeth to find.

                    Kinda new to this engine stripdown / rebuild business but someone said to me earlier here " It's only nuts and bolts"

                    Thanks

                    Derek
                    Stumbling around in the dark
                    Marina based SWB roadster
                    Alfa Romeo 1750 with 5 speed box

                    Comment


                    • #11
                      Re: Alfa 1750 alfetta

                      I think I was lucky as my liners came out fairly easily enabling me to replace the seals at the bottom. I have heard they can be tricky to get out but you should be able to check for excessive wear or damage without removing them. In my case a ring had broken, damaging the piston and scoring the bore. I'll have another think about the compression problem.

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                      • #12
                        Re: Alfa 1750 alfetta

                        All pistons now out and no sign of scoring or broken rings. I feel the problem is head to block sealing somewhere as when I drained the oil nice clear water came out the sump first, there was water in the bottom of the oil filter housing and even water lying underneath the oil in the head.
                        There had been no sign of this prior to losing compression intially.
                        The engine did start (with difficulty) and run rough on 3 cylinders, No4 having a fuelling issue.
                        After the gasket was replaced it was nightmare to get going.
                        I think i will have to attempt to remove the liners and check the block deck is flat and not cracked.
                        Break out the credit card I think.
                        Stumbling around in the dark
                        Marina based SWB roadster
                        Alfa Romeo 1750 with 5 speed box

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                        • #13
                          Re: Alfa 1750 alfetta

                          On my engine the vacuum pipe for the brake servo is connected to the no.4 cylinder inlet manifold. If this connection is not made or the hole not blanked off then no.4 will run very lean due, presumably, to excessive air being drawn into the cylinder. Not sure if the 1750 is the same.

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                          • #14
                            Re: Alfa 1750 alfetta

                            Originally posted by Grum View Post
                            On my engine the vacuum pipe for the brake servo is connected to the no.4 cylinder inlet manifold. If this connection is not made or the hole not blanked off then no.4 will run very lean due, presumably, to excessive air being drawn into the cylinder. Not sure if the 1750 is the same.
                            This is the same on the 1750. The connection to the servo is there however if I ever get the engine back together I will certainly look at this as I could get No4 to pick up if I choked the carb barrel with my hand to draw fuel.
                            Stumbling around in the dark
                            Marina based SWB roadster
                            Alfa Romeo 1750 with 5 speed box

                            Comment


                            • #15
                              Re: Alfa 1750 alfetta

                              If your servo is a bit iffy or getting on in years it could be leaking air through the seal between the master cylinder and the servo unit, or fit a non return valve in the hose from manifold to servo.

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