SM Engine Rebuild in AUS?
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Thread: SM Engine Rebuild in AUS?

  1. #1
    Tadpole
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    Default SM Engine Rebuild in AUS?

    Hi all

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    Sadly my SM engine recently made horrible noises (at only 2500 rpm)and expired, after a great deal of backfiring. Cylinders #1 and #3 have zero compression and total leakdown back through the carby throats. Exhaust valve #3 now has a 4mm clearance to cam lobe! Exhaust camshaft on cylinders 1-3 gear teeth are not in mesh- could be either the cause or the result of the problem.

    The chains were recently tensioned so I dont think it's chain slip but maybe the un-meshed cam gear that caused the problem. I believe that there are bent valves lurking, but havent removed the heads as yet.

    The engine was fully rebuilt by Dave Burnham New York State about 20,000 miles ago and has been maintained by the book or better; never run hard

    Question: does anyone know of a workshop in Australia able to rebuild the Maserati engine? I have checked DS Motors and SM Australia but unfortunately they can't assist. I could send it to Dave in the USA but obviously if there was someone in AUS that would be much easier logistically.

    Any recommendations for local experts gratefully received

    Thanks
    Attached Thumbnails Attached Thumbnails SM Engine Rebuild in AUS?-img_1330.jpg   SM Engine Rebuild in AUS?-l4274438.jpg  

  2. #2
    Fellow Frogger!
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    Default

    That sound like very bad luck for you.

    you could discuss this with Tim at Black Stallion Motors in Ringwood Victoria.
    03 98730308. Tell him Ted Cross sent you. ( He is a Citroen man also - apart from Ferrari's and Range Rovers.)
    85Fuego likes this.

  3. #3
    Fellow Frogger! marc61's Avatar
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    I'd suggest trying your local engine reconditioning place. I had something similar happen in 2000. I took the head off and two inlet valves were bent, so bought two new valves and took it to my local machine shop telling them what the valve clearances should be. They sorted it, I refitted the head and all has been good since.

    I don't know if the same happens in Australia as in the U.K., but if the word Maserati is mentioned the price of doing the work will be at least doubled! I left the cam cover off when I walked in so that word wasn't staring them in the face and said it was a from an old Citroen . An engine is just an engine...
    JohnW and UFO like this.
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

  4. #4
    Member Mitchell's Avatar
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    Hi dssm73,

    In the absence of someone with specific experience of the Maserati C114 motor - nearer to you, I'd go to Leon at Autodelta (He's had experience rebuilding several of these engines)

    https://www.autodelta.com.au/

    And experience counts....particularly on these.

    Cheers,
    Rhys
    JohnW, Wildebeest and Greg like this.

  5. #5
    1000+ Posts Ken W's Avatar
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    Hi DSSM73,

    I think the same thing happened to my SM very early in its life according to the service record. The ring that locks the cog onto the camshaft via the castellated disk so that the valve timing is correct, loosens and the camshaft gets out of timing and the pistons hit the valves. Mine was repaired without major work being required to the pistons. It only needed one head to be taken off, new valves fitted, head replaced and to have the camshaft timing reset.

    Whether your whole engine needs a rebuild depends on the condition of the rest of the engine. Is it leaking oil anywhere else? Maybe it just needs a repair.

    Cheers, Ken

  6. #6
    Fellow Frogger! citroenthusiast's Avatar
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    FWIW, here is a tool I made for locking the cam nuts: It is a 2-inch pipe coupling cross drilled and threaded for 1/4-28 grade 8 bolts. I brazed a piece of 2 inch pipe to the end and drilled that so I could insert a piece of 1/2 inch pipe for leverage. I figure I get about 200 ft-lbs of torque no problem. Use Loctite....

    SM Engine Rebuild in AUS?-cam-nut-tool-2-.jpgSM Engine Rebuild in AUS?-cam-nut-tool-3-.jpg
    Greg likes this.
    Cheers,
    John T.

    61DS19 LHM BVH (son's); 67DS21 BVH; 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  7. #7
    skp
    skp is offline
    Fellow Frogger!
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    I'm rebuilding one at the moment... Did the top end a few years ago, but left the bottom end, as it was reasonable.
    Since then, the gearbox sprang a leak, so out it all came again. (Bugga!)
    Doing the bottom end this time, to finish off a full restoration.
    Contrary to Mitchell, I had to sort out the extensive mess made by Autodelta....
    I have no problem working on these engines. Give me a call: 0404 231 712

    skp
    Greg and Arekisir like this.

  8. #8
    Fellow Frogger! citroenthusiast's Avatar
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    Any reasonably competent engine machine shop can work on this engine if they have a copy of Manual 1-S. You can download a copy here.
    http://www.thecarnut.com/Manuals/SM_Engine_Rebuild.pdf
    Greg likes this.
    Cheers,
    John T.

    61DS19 LHM BVH (son's); 67DS21 BVH; 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  9. #9
    Tadpole
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    Hi
    I suggest that you have a chat or go and visit Angelo at APF Motors at Boondall just off the M1.

    Specialist Italian repairs and I have seen a number of older Maserati cars there. It's great just to wander around the paddock of spares/wrecks to see the 'faded' Italian beauties (the rust needs to be seen to be believed!)

    APF Motors - Our Services

    Cheers
    Jason
    Greg likes this.

  10. #10
    Tadpole
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    Default SM Engine Rebuild in AUS

    Many thanks to all for the valuable input

    Next step is to take the head off and see how much internal damage has been done

    I will follow up on the suggestions for sure

  11. #11
    Fellow Frogger! citroenthusiast's Avatar
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    It is surprisingly easy to get the heads off that engine. Move the engine to the cam timing position (TDC end of exhaust #1). Drain the coolant (there is an M8 bolt in the timing cover near the oil filter to drain that side of the block). Disconnect the throttle and choke cables, then loosen the two bolts holding the intake manifold and off it comes with the carbs. Find the master link in the upper chain and open the chain (wire the ends of the chain together temporarily so it doesn't drop into the engine). Undo the 5 bolts holding the upper exhaust manifold to the lower manifold. Loosen the 8 head bolts and off comes the head.
    Cheers,
    John T.

    61DS19 LHM BVH (son's); 67DS21 BVH; 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

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