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Finding TDC for cylinders 2 &3

Discussion in 'XJ Technical Chat' started by cdev, Feb 23, 2024.

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  1. cdev

    cdev New Member

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    I'm wanting to do a leak down test on my 1980 xj650 but there is only one mark for TDC which the manual says is for cylinders 1 & 4. For testing cylinders 2 & 3 do I just eyeball it and line up the "T" mark exactly opposite the mark or is there a trick to it?
     
    cdev, Feb 23, 2024
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  2. bensalf

    bensalf Well-Known Member

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    old school, is , remove plugs, rotate engine with spanner on crank bolt, till piston is nearly at TDC, get a pencil and put it down the plug hole till it rests on the piston, then slowly rotate crank until pencil stops rising, dont drop it though:eek:
     
    bensalf, Feb 24, 2024
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    Franz likes this.

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