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Thread: Thinking cap time

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  1. #1 Thinking cap time 
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    How do I stop the crankshaft pulley from going round when I try to undo the large nut (36mm across the flats)

    So far I have been fairly gentle with it.
    The rubber coupling on the front of the prop-shaft flexes and negates stopping the rear wheels turning (in 1st or reverse gears)

    I think tomorrows effort may involve a impact driver and the air hammer.

    It is on an Alfa engine but I suspect the solution does not involve the make of engine
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  2. #2 Re: Thinking cap time 
    frequent forum contributor Club Member b_caswell's Avatar
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    Take the starter motor off and lock the flywheel make sure you release any locking tab.

    Impact driver should do the job or 3 shredded wheat for breakfast!!
    Last edited by b_caswell; 13-02-2018 at 03:10 PM.
    Ben Caswell probably not the last word on anything here!!
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  3. #3 Re: Thinking cap time 
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    Thanks Ben will try that tomorrow after 2 shredded wheat for breakfast!!!
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  4. #4 Re: Thinking cap time 
    frequent forum contributor Club Member b_caswell's Avatar
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    Ben Caswell probably not the last word on anything here!!
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  5. #5 Re: Thinking cap time 
    frequent forum contributor Club Member Alan c's Avatar
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    Do what I did last weekend on my MGA - just forget you have a spanner on after doing some other work and try and start it - one load clunk and you find nut in corner of garage - not my proudest moment
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  6. #6 Re: Thinking cap time 
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    Ben's method works fine but whatever you engage into the flywheel teeth needs to be fairly strong as the crankshaft pulley on this engine is torqued up to a very high value (about 140lbft if I remember correctly)
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  7. #7 Re: Thinking cap time 
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    You think that's tight, my Volvo Tdi c/s nose bolt is 120lbft + another 180° That is tight.
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  8. #8 Re: Thinking cap time 
    frequent forum contributor Club Member stevejgreen's Avatar
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    If you are trying to do it with a spanner, be aware that some are attached with a tab washer.

    Otherwise Ben’s principle works if you have. 1/2”+ breaker bar set for the correct rotation..

    But in my opinion a good soak with Plus Gas for 24 hrs works wonders for stubborn fixings.
    MOC member since 05/97
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    The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

    Loads of Marlin Reference can be found documents here or there.
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  9. #9 Re: Thinking cap time 
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    I tried the "utube" method. The starter was not man enough to do the job.
    So I started to remove the starter motor. I'm still to remove it.
    Some idiot (me) welded the engine mount, and it need to be taken off so that the starter can come forward.
    Oh yes I nearly forgot the 3 bolts that held the starter on.
    1 was a 1/2" unf
    1 was 13mm
    1 was a 14mm
    All spanner sizes
    The 14mm did not have a nut. it did'nt need one it was so tight. An impact driver with my 3 socket lengths enabled me to hit the driver.
    Perhaps later today I will work on it again!
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  10. #10 Re: Thinking cap time 
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    If the Alfa is similar to my Fiat you can see the lower half of the flywheel in the bellhousing. (rear side)
    I made up the following little lock plate which locates in a hole in the rear of the flywheel at TDC and bolts to the face of the bellhousing.
    This allowed me to set up my cam timing and lock the c/s nose bolt.
    Attached Images
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