I cannot find the timing mark on the cam belt pulley of my 1996 mitsubishi libero, so is it set with the car at tdc

follow this u-tube vid link , if not exact model search u-tube for exact model
1996 Ford Ranger Timing Belt Replcement

On the pulley, they are marks that line up with a mark on the head. That is TDC for the cam. Then set the crank to 0 on the timing marks. Put the belt back on.

At #1 TDC both cam pulleys will have a mark that lines up with marks on the top of the Timing belt cover. They will point straight up.

set mark on crankshaft to TDC mark on timing cover. set mark on cam pulley to align with mark on head .if more than one mark on pulley rotate by hand till exhaust and inlet just rocking then align closest marks .

Rotate the engine so that No. 1 cylinder is at TDC on the compression stroke. Check that the timing marks are aligned on the camshaft and crankshaft pulleys. An access plug is provided in the cam belt cover so that the camshaft timing can be checked without removal of the cover or any other parts. Set the crankshaft to TDC by aligning the timing mark on the crank pulley with the TDC mark on the belt cover. Look through the access hole in the belt cover to make sure that the timing mark on the cam drive sprocket is lined up with the pointer on the inner belt cover.

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The 2 cams are linked with a chain at the rear of the cylinder head.

The cams need to be set so the slots on the chain sprockets line up with the cam tower caps with 16 links between cam caps.

You cannot see the front crank pulley tdc mark so you need to lock the engine at tdc with a screwdriver jammed into the timing hole on the bell housing after setting engine at tdc or use a DTI
to check to tdc in the #1 spark plug hole.

If the cams have not been disturbed you only need to set the belt cam sprocket to the mark and crank to tdc.....all this means pulling the core support into the service position so the belt tensioner can be locked down and/or doing a complete belt job along with a coolant pump if over 70,000 miles..

Hi, the crankshaft marks are on the belt pulley and timing cover, so you have to mate it up to see them. The cam sprocket mark goes on the bottom, and aligns with another mark on the timing cover. There is a plug you pull out and hole to look thru to align the cam sprocket/shaft.








Rotate the engine so that No. 1 cylinder is at TDC on the compression stroke. Check that the timing marks are aligned on the camshaft and crankshaft pulleys. An access plug is provided in the cam belt cover so that the camshaft timing can be checked without removal of the cover or any other parts. Set the crankshaft to TDC by aligning the timing mark on the crank pulley with the TDC mark on the belt cover. Look through the access hole in the belt cover to make sure that the timing mark on the cam drive sprocket is lined up with the pointer on the inner belt cover.

With the belt off and the tensioner pulley pushed back, you will need to set cylinder 1 (far passenger side) to top dead center. There is a mark on the block you can see just behind the crankshaft gear that needs to be aligned to the mark on the crankshaft gear. CAUTION NOT TO TURN THE CAM PULLEY TOO FAR IF ANY PISTONS ARE AT TDC, they will contact the piston on this motor. turn the crankshaft gear forward or backward 1/4 turn off of TDC when you move the cam pully. Once this is done, you will need to set the camshaft pulley to a poorly designed mark on the cylinder head. (it is the corner point of the casting for the cylinder head, it forms a triangle at about the 10:00 position when looking at the cam pulley). Install your belt, it will be tight even with the tensioner pulled back so making sure it doesn't cause either of the gears to move off their marks. Once it on recheck the timing marks upper (cam) and lower (crank), release the tensioner, put your other belt on and you're done. http://www.mivec.co.nz/tech/4G9x_Engine_Manual.pdf

on the bottom pulley, a dent, fit belt round bottom pulley, rest bottom cover on and a notch sticks out, tdc. cam has a pointer and a dot, line all up tension belt.

For all timing belts you should start with the crank sprocket pointing at TDC and the cam sprockets pointing at their designated marks.

You should be able to mark the old belt and and put corresponding marks on the cam and crank pulleys, then remove the old belt and transfer the marks to the new belt and install it.

Personally I would buy a manual as this would provide you with a step by step guide to performing the repair.

I am not positive that this is an interference engine, it looks like it is to me. If you are not accurate in your timing you will cause severe engine damage.