Compression Low

Discussion in 'Engine' started by damoc180, Aug 19, 2011.

  1. damoc180

    damoc180 New Member

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    So, i went to start the car last night. It compressed once then sounded like it lost pressure when cranking. Oh fun...Went to a friend to borrow a compression tester and sure enough, 30 psi on cyl 1, nothing on cyl 2. By this point i was getting very wet in the rain in my drive and decided to call it a day and reluctantly borrow a Nissan =[
    I am thinking possible head gasket, but i am just hoping its nothing more serious than that. Dont get me wrong, the car is worth spending the money on to get it right but i just dont want to break the bank repairing it. Good thing is i can do it myself i suppose so i will save some money on the labour costs =/ Its just gonna be a case of fitting it in between other jobs. Wont get started till moday now anyway, or even picked up and taken to work =[

    I was looking forward to my first proper drive out in it today. Ive had it 6 weeks and not really been anywhere. Oh well, ill have to find other means of getting to Edinburgh. Something tells me im going in the Nissan =/ Better than the train, though
     
  2. Ian B Walker

    Ian B Walker MB Enthusiast

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    Are you sure its a head gasket? i would do a wet test also and if you have the facilities also do a leak down test too. I would hazard a guess at a burnt valve as no compression. Taken your figures if it was a head gasket then the coolant would gush out of the header tank.
     
  3. Dieselman

    Dieselman Banned

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    It could be blown between cylinders 1 & 2 though, hence no coolant leak and it's unlikely a burned valve would suddenly become a problem.
     
  4. Stratman

    Stratman MB Enthusiast

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    Surely it would need two burnt valves for the compression to be down on two cylinders?
     
  5. grober

    grober MB Master

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    CHG failure pretty common on these engines at high miles- if you do take it off examine the head for signs of erosion / porosity-- use new cylinder head bolts ---the early ones were inclined to stretch and make sure you have a good puller to remove the pin holding the timing chain guide to the cylinder head.

    ps use only the pukka MB head gasket -- made by Victor Reinz http://www.reinz.de/root/eng/aftermarket_496_ENG_HTML.php#
     
    Last edited: Aug 19, 2011
  6. OP
    OP
    damoc180

    damoc180 New Member

    Messages:
    7
    Joined:
    Jul 18, 2011
    Car:
    W202 C180 Elegance
    Well I am only saying head gasket provisionally. I just cant imagine sudden valve problems ine two cylinders suddenly, at the same time, unless the chain has jumped =[ (fingers crossed)
    Started stripping it today, just the chain to get off and the head should be out tomorow. Will know more then
     

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