Crash leads to valve pushrod misalignment

Discussion in 'GS Boxers' started by farmerger, Jul 10, 2013.

  1. AntonLargiader

    AntonLargiader Long timer

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    Or maybe you're just in it for a valve cover, two valves and a head gasket. And a bunch of time.

    Only you know if you can assess the condition of the rest of it.
    #21
  2. Beezer

    Beezer Long timer

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    too late, but I would have done a differential compression check (leakdown) to see if the valves leak. if that passes, I would manually operate the valves in the head to see that they move ok & don't stick.

    then, dial the pushrods to see if they are bent. inspect the chain full length. polish the scrarched looking stuff with fine sandpaper (or not). reassemble, run it, check it

    as it is.... I would not worry about the piston in the slightest. get a brush on the piston head & knock off the carbon so you can see. since the head is off... dial the valves to see if they are bent. check the guides for cracks.... especially if they are cast iron... wouldn't worry much if they were bronze.

    if you are worried about the cam have someone Magnflux it

    if the valves arn't bent to the point where they stick in the guides the damage is negligible
    #22
  3. def

    def Ginger th wonder dog

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    Do you plan to keep the bike? If so, I would tear down to the piston and rod (remove the cylinder) for a thorough inspection and satisfy myself that the piston skirt is OK.

    If not, a couple of valves, some gaskets, reassemble and sell it.

    What is the VIN for your bike?
    #23
  4. Beezer

    Beezer Long timer

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    naw.... don't be so paranoid. over the years I've fixed at least half a dozen rigs with interference engines that have dropped the cam chain/belt. I'm driving one now in fact (I got it real cheap because the chain broke)... it bent 4 valves 30 degrees off axis, but the cylinder head was fine. the pistons had little finger nail grooves in the tops, but pistons are pretty tough. check for cracks, buff out the rub marks if they bother you (if there are any.... looks like not) dunno.... I got 25000 miles on this one since the failure. GMC Tracker (Suzuki)... my daily driver
    #24
  5. Anorak

    Anorak Woolf Barnato

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    I have the remains of four broken valves from a Triumph Speed Triple. The timing chain jumped and broke the valves. All it needed were four new valves.

    Then there was the Ducati 999 that lost a collet and dropped a valve. The stem looked like a noodle. A new valve and it was fine.
    #25
  6. farmerger

    farmerger Snowed in Adventurer

    Joined:
    Feb 17, 2006
    Oddometer:
    534
    Location:
    Chase, BC
    Been on the fence on selling it for a while now. It will go up for sale once/if its fixed. If it does get fixed I want the buyer to be confident in buying a solid bike, not a liability. Thanks for all your guys' advice. If I was keeping it I would just put in new valves, a new follower and pushrod and ride.
    #26