(G) Timing Problem

My dad has just replaced the circulation pump on his 1992 Fiat Uno IE (999 I think)
The replacement when perfectly but the problem came when after the timing belt was put back, as the engine fails to start.

Can someone please help with this problem, he thinks the timing must be off somehow and is unsure what to do next

Thank you for your help.

The timing belt connects two pulleys which need to rotate with a precise relative position. Infact this precise position corresponds to a synchronization between camshaft and the drive shaft. You need to set it properly. If you fail to set it you can cause engone not to running (if you are luky), but you can cause hard valve and pistons damage if you aren't lucky.
Pheraps I don't know how to set it correctly, but I guess it's an easy setting: you only need to put the timing belt when pulleys are in a precise position. But you can solve this problem downloading the "Fiat UNO guide" which is present on this forum: you need to go in FIAT UNO forum's main page and click at the first post (which is called "Have you got a problem with your UNO?"). Inside that post there is a link where you can downolad a well explained and complete technical guide for fiat UNO. It's a PDF file (approx 10 Mb) and you can find how to regulate your camshaft.
Hope to be helpful!
Andrea.

We just triead all morning to get the timing right but nothing
Found 3 different marks on the lower sprocket then 4 guides on the cover, tis driving us mad

This engine (FIRE) is kind of idiot safe. If your timing belt snaps ehen driving or is some teeth out, the pistons will not strike any open valves as other engines.

You will find marks on the engine block / head that should correspond with marks on the wheels.

Morten.

OK,
The engine block has a notch just below the join line for the cylinder head, on the left as you face the cam pulley. The notch in the cam pulley must be lined up with this. Use the marks on the flywheel (and window in gearbox housing), remembering to set the crankshaft to the leftmost mark as you view the flywheel.

The distributor drive dog is offset, so it is not possible to get it wrong.

If the engine doesn't start after much cranking, it may be flooded (nothing wrong with the timing!) Hold the accelerator all the way down, and keep cranking.

Monty Mort is right - no damage will result even if the timing was wrong.

Thanks and good luck,
-Alex