Duplex timing chain

Side valve, 803, 948, 1098., 1275 and Vizard mods

Duplex timing chain

Postby gasolinescream » Tue Sep 03, 2013 7:17 pm

I have a duplex timing chain set with the countersunk screws and parts needed to do the job. The engine is out of the car.

Any tips on what type of drill bit to use to countersink the new screws and how can I lock the engine to be able to get the crank nut off? Can I simply put the box in gear to hold it? Any other tips on doing this please?

I have a BMC manual but nothing better than feedback from those that have done it.

Many thanks Dan :wink:
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Postby chrisryder » Tue Sep 03, 2013 7:23 pm

Remove the starter motor (if not already) and jam something in the ring-gear.

As for countersinking, just use a drill bit of a bigger diameter that the head of the screw, and with the same angle.
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Postby gasolinescream » Tue Sep 03, 2013 7:32 pm

Chris I was thinking about a bit of wooden 2x2 or something, can't see that doing anything untoward, is that a done thing?? Gearbox in gear not a good idea then?

On a roll at the moment so don't want to screw anything up :roll:

Cheers
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Postby Custard » Tue Sep 03, 2013 7:58 pm

If it is out of the car then the gearbox in gear would do nothing anyway. It will still turn.

Also unless the engine is firmly bolted in a stand you will find it is a job easier done with help.

One to undo the bolt and the other to keep the flywheel locked solid.

Wood will probably just splinter, but a few bits can help hold the screwdriver, crowbar, end of an old leaf spring, or whatever in place.

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Postby bmcecosse » Tue Sep 03, 2013 10:37 pm

The crank dog is best undone with engine IN the car - the starter motor doing the work for you.  I suppose if you can lash it to a bench - you could still use the starter - and wedge the spanner on the dog against the floor - do throw an old blanket over it, in case it goes flying......     Make sure the swarf from drilling doesn't enter the engine.  Make sure the c/sink is the correct angle - and be sure to use Loctite.
 









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Postby gasolinescream » Tue Sep 03, 2013 10:51 pm

Thanks I should have done this before I removed the engine really. It came out for a clutch but it's getting a repaint whilst it's out. I'll have a go with the wood first and see how I go. I'd rather get the timing gear done before I paint it up.

Many thanks
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Postby bmcecosse » Tue Sep 03, 2013 10:56 pm

Where are you going to put the wood?
 









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Postby MM » Tue Sep 03, 2013 11:33 pm

If you're replacing the clutch, remove the gearbox and use Stilsons or similar on the end of the clutch where the release bearing rubs up against - they are an oblong shape.

Alternatively, use a stout rod through the holes in the side of the clutch.

Then, with your foot to hold the engine block against the floor, you can get a decent bit of leverage on the crank pulley - a length of scaffold pole can be used to extend whatever lever you are using to undo it.
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Postby bmcecosse » Wed Sep 04, 2013 9:22 pm

Careful!  I've known a crank nose to become bent  using undue side force..
 









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Postby gasolinescream » Wed Sep 04, 2013 9:47 pm

I'm going to do what I should have done at first and change it whilst it's in the car. It will be just that much easier especially as i'm working alone. I've been prepping the block for paint today and nearly done and have decided that I'll paint the motor all bar the timing cover and when it's off i'll paint it up. I'll loosen it off so I can paint the block without pulling paint when the cover is removed and I finally get that damn nut off!!!

However i'll need to fit the new UJ's beforehand, time for another post I feel.

Cheers Dan
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Postby Mainlander » Wed Sep 04, 2013 9:54 pm

I was stripping an old motor a while ago and could not get the nut loose. I put the motor in the back of a car and went to the local friendly tyre shop. After a quick burst with the truck tyre impact gun the nut was loose. Saved lots of struggle.
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Postby bmcecosse » Wed Sep 04, 2013 9:57 pm

Yes - that works well - if they have a socket deep enough to go over the starter dog....
 









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