Technical Timing Help Please.

[*welsh.wizard*]

Hi all,

I have an N reg 2.0 Petrol 8V Fiat Ulysse and would appreciate some help on the timing side of it please.

Especially the Crankshaft Timing marks.

I have added some images below.

 

[avionista]

Assuming your engine is similar to the Peugeot 806 8V petrol model, the procedure for replacing the timing belt is to pin both the crankshaft and camshaft pulleys BEFORE disassembly. A short rod (or suitably sized bolt) should be inserted at approximately the 'eight o'clock' position to lock the camshaft. Before unbolting the crankshaft pulley, a short rod/bolt should also be inserted through it at approximately the '11 o'clock' position. Once this is done, the flywheel should be locked in position and the rod/bolt through the crankshaft pulley should be removed.

The crankshaft pulley/lower timing cover/timing belt/etc can now be removed and the new belt fitted whilst the camshaft and crankshaft remain locked in position. Most DIY mechanics will not have the equipment to measure the tension of the new belt in SEEM units but twisting the belt through 45 degrees with your fingers should enable a reasonably satisfactory belt tension to be set.

If you have removed the timing belt without first locking the camshaft and crankshaft in position, you may be able to determine the correct crankshaft setting by refitting the pulley and inserting a bolt at the correct position.

 

[*welsh.wizard*]

Assuming your engine is similar to the Peugeot 806 8V petrol model, the procedure for replacing the timing belt is to pin both the crankshaft and camshaft pulleys BEFORE disassembly. A short rod (or suitably sized bolt) should be inserted at approximately the 'eight o'clock' position to lock the camshaft. Before unbolting the crankshaft pulley, a short rod/bolt should also be inserted through it at approximately the '11 o'clock' position. Once this is done, the flywheel should be locked in position and the rod/bolt through the crankshaft pulley should be removed.

The crankshaft pulley/lower timing cover/timing belt/etc can now be removed and the new belt fitted whilst the camshaft and crankshaft remain locked in position. Most DIY mechanics will not have the equipment to measure the tension of the new belt in SEEM units but twisting the belt through 45 degrees with your fingers should enable a reasonably satisfactory belt tension to be set.

If you have removed the timing belt without first locking the camshaft and crankshaft in position, you may be able to determine the correct crankshaft setting by refitting the pulley and inserting a bolt at the correct position.

We put the bolt through the cam and that locked up alright, when we turned the crank up in to place the piston knocks the valves

 

[avionista]

We put the bolt through the cam and that locked up alright, when we turned the crank up in to place the piston knocks the valves

Ideally, the camshaft pulley and crankshaft should have been locked in place before removing the old belt, however, this is of no help to you now.

Looking at your photos, the crankshaft pulley appears to be keyed to the crankshaft so it can only be fitted in one position. The crankshaft pulley seems to have three round holes in it so the question arises, which one is the timing hole? Also are you certain there is only one possible locking position for the camshaft pulley and, if not, perhaps you could try a different one?

My approach to your problem would be to remove all the spark plugs, put a rod through the spark plug hole of No 1 cylinder and turn the crankshaft until the piston is approximately half-way down the cylinder bore. With the camshaft cover removed, I would then turn the camshaft pulley until the inlet and exhaust valves on cylinder No 1 are both closed and lock it in this position. I would then reinsert a rod into cylinder No 1 and carefully rotate the crankshaft until the piston reaches TDC. At this point I would check to see if the timing bolts could be inserted in the camshaft and crankshaft pulleys.

Hope the above helps.