5 replies to this topic

[Joe555]

1989 1275cc Metro engine.

What mods do I need to do to the timing chain cover to fit a duplex timing chain. Does the bit of metal inside the breather need to be removed????

Joe

[mars red mike]

From what I remember there is a small inward facing lump next to the hole where the crank comes through. This needs tapping flat. There is also a round metal piece around the breather hole that I gorund off. Not sure if it needs to come off but I did anyway.

[Cooperman]

There are 3 things you need to do:

1. Remove the 'lip' inside the timing cover.
2, Countersink the engine front plate where the 2 off 1/4" UNF bolts are fitted and replace these bolts with 1/4" UNF x 5/8" long socket head countersunk screws, using Loctite to ensure they won't come loose. Use a correct countersinking tool, not a large drill, as the angle of the countersink needs to be correct.
3. Remove the chain tensioner and fit 5/16" UNF bolts to fill the redundant holes.

Check the accuracy of the cam timing using a 360 degree engine protractor and a dial gauge. Correct any error with offset woodruff keys. Some after-market timing chain sprockets are not particularly accurate. If you have a standard Austin-Rover cam, the correct timing is 110 degrees ATDC on the inlet valves.

In hope this helps.

Edited by Cooperman, 02 January 2011 - 03:10 PM.

[mars red mike]

Oh yeah. Dont forget to fit a new crank seal and make sure that you fit the oil thrower the right way around.

[Cooperman]

To add to what 'mars red mike' said, if your cover has the indentation adjacent to the lip which you are to remove, this does need to be knocked out with a ball-ended hammer. I think those earlier covers may not have this though, but I could be wrong.

[Joe555]

Thanks for the help.

Joe