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Thread: Conrod squirty oil direction info

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    Conrod squirty oil direction info

    Just rebuilding an 2.25 petrol engine and realised I was unsure which side the oil hole on the conrod points - to the drive or the passenger side of the engine. I didn't take the engine apart so at least I have that excuse!.

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    My workshop manual says:

    When refitted, the 'X' mark on the piston crown (where applicable) is to be toward the front of the engine, and the oil spray hole in the connecting rod toward the camshaft.
    Last edited by p38arover; 7th February 2025 at 08:23 PM.
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    Before reading that post, without looking anything up, I had the following chain of thought -

    1. Heaviest load is on power stroke, and I assume this is when lubrication is most critical, with highest pressure

    2. With the engine turning clockwise (from front), that means the reaction force from the angle of the conrod will be against the camshaft side of the cylinder

    3. Hence, this is the side we want the oil squirted on!
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  4. #4
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    Not specific to any particular engine but this is the idea:
    piston lube diagram.jpg

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