Re: Where are the timing marks on a David Brown 850 (Oliver 500)?

In a word I can't tell you where the flywheel mark is if you can't find it on the left side of the bellhousing,the bell housing may be different than that used on the DB tractor,the pin you mention does it unscrew and go back in the hole the other way to engage with a hole in the flywheel?,the other way to do it is take out the four spark plugs,turn the engine by hand in the normal direction with your thumb blocking the plug hole of no1 cylinder,when you fee the compression on your thumb put a clean rod down the hole,turn the engine slowly till the rod stops rising,play about and find the highest point that will be TDC,mark the pulley to the front cover,now see where no1 plug lead fits into the distributor cap,put a mark on the distributor body in line with where the lead goes,remove the cap,the rotor arm should be pointing at the mark you made,turn the engine back a bit,connect a test lamp to the wire going from the coil to the points and the other end to ground,switch on the ignition,turn the engine till the pulley mark lines up with the cover mark,the test lamp should have just come on,if not loosen the distributor clamp and move the body against the way the rotor turns to bring the light just on,if the light is on move the body the other way till it goes off and back again till it just comes on,lock the clamp,take the test lamp off and put the cap and plugs back try to start,if it runs you may have to move the distributor to fine tune it,someone over at the dbtc.co.uk will know about the timing marks.
AJ

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