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  1. #21
    Join Date
    May 2008
    Location
    Scotland / Norway
    Posts
    1,417

    Default Re: Yanmar 1GM water pump

    Quote Originally Posted by olly_love View Post
    We have just had this same issues, but with a bit of northen engineering it works.

    the nut is a 10mm so if you get a 9mm socket and extension and hammer this onto the corroded head (use alot of force) it dislodges the rust and frees the bolt then with alot of force into the thread (not torque) it shoudl pop off,
    the others came off using some nedle nosed molegrips.

    after a few hours swearing ours came loose this way
    Done that method a few times. Especially useful if there is a thin skin of even rust on a bolt head = 1 or 2 sizes below normal.
    It gets very scary doing this on anything under 6mm. They tend to behave like Cheddar cheese ...

  2. #22
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    10,258

    Default Re: Yanmar 1GM water pump

    Quote Originally Posted by pagoda View Post
    Done that method a few times. Especially useful if there is a thin skin of even rust on a bolt head = 1 or 2 sizes below normal.
    It gets very scary doing this on anything under 6mm. They tend to behave like Cheddar cheese ...
    I was undoing four 8mm bolts on a car yesterday .... 13mm heads so quite chunky but the bolts protruded a cm beyond the captive nut. Two of them were badly rusted on the inaccessible thread beyond the captive nut, so after treating with easing oil I gently undid them a 1/4 turn, then back in, then out 1/2 turn, them back in etc etc.

    The first one came out after a few minutes but after half a dozen threads the second one went tight on the anti-clockwise turn so I turned it clockwise as before but this time it was rock solid in both directions, even though it was now well out beyond the outer plate. Not being able to budge it in either direction resulted in the inevitable shear once I applied enough (too much!) force. Then followed the inevitable drilling out and re-tapping.

    That's the first time I can really remember a half-removed bolt shearing.

    Richard

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