309 compression issues
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  1. #1
    Tadpole
    Join Date
    Apr 2005
    Location
    New Zealand
    Posts
    2

    Default 309 compression issues

    Hi all, first post here as I am just a newb to this forum.
    Put a new (2nd hand) motor in a 309 and it wasnt runiing properly, had to be tuned retarded to run properly. Checked the compression rations and they read as
    Cylinder # 1 2 3 4
    Compression in lb/sp in. 175 80 80 175
    as they all should be approx 130 this is very wrong.
    Anyone have any ideas as to what could be causing this?
    its a 1.6l gr carb model

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    Owner of a '67 404 cabriolet (one of the original rhd conversions) and numerous for 404 sedans for spare parts,504, 205 cabriolet, couple of 304's, 309, 2 605's.
    Only just started, more to come

  2. #2
    1000+ Posts PeterT's Avatar
    Join Date
    Jul 2000
    Location
    Castle Hill, Sydney
    Posts
    7,483

    Default

    Quote Originally Posted by frizzell
    Hi all, first post here as I am just a newb to this forum.
    Put a new (2nd hand) motor in a 309 and it wasnt runiing properly, had to be tuned retarded to run properly. Checked the compression rations and they read as
    Cylinder # 1 2 3 4
    Compression in lb/sp in. 175 80 80 175
    as they all should be approx 130 this is very wrong.
    Anyone have any ideas as to what could be causing this?
    its a 1.6l gr carb model
    They should be more like 180 each. Looks like a blown head gasket between 2 and 3. Put a few drops of oil in 2, and then 3. If they come up immediately then it's blown rings. If they don't improve then it's the gasket or leaking valves.

    '92 205 Mi16
    '90 Mi16x4

  3. #3
    Tadpole
    Join Date
    Apr 2005
    Location
    New Zealand
    Posts
    2

    Default

    Quote Originally Posted by PeterT
    They should be more like 180 each. Looks like a blown head gasket between 2 and 3. Put a few drops of oil in 2, and then 3. If they come up immediately then it's blown rings. If they don't improve then it's the gasket or leaking valves.

    thnkas heaps, will try that
    Owner of a '67 404 cabriolet (one of the original rhd conversions) and numerous for 404 sedans for spare parts,504, 205 cabriolet, couple of 304's, 309, 2 605's.
    Only just started, more to come

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