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Old 18-04-2004   #1
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cam belt timing marks

1994 Fiat uno 1.0 Start
Replaced head gasket and had head skimmed, the car started but was one tooth out on the timing. After re-setting the timing the engine refuses to start and sound as if there is no compression when turning over, any ideas, also can anyone tell me the exact location of the mark on the oil pump casing for the crankshaft pulley to line up with, i do not seem to be able to find one. (maybe i need stronger glasses?)
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Old 18-04-2004   #2
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A guy called Dave will give you the answer to this, he knows everything there is know about Fiat engines and such, give him a day at most to see your post :)

Have you checked the haynes manual? Sorry for such an obvious question. If not, there is a link to download it on the main page and it might offer some assistance.

Nice choice of car (I have exactly the same ;) )

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Uno 1.0ie Start. Standard.

I am a schizophrenic currently so please bear with me whilst I try to get rid of the 40+ personality.
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Old 18-04-2004   #3
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nobody knows everything there is know about Fiat engines, 50% of what i know is from other peoples posts, when i learnt macanics at collage all we had was mini engines and an old ford anglia.
however the answer to this is on the forum some where just give me some time and i'll try to find it :)

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Old 18-04-2004   #4
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got this so far

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Old 18-04-2004   #5
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so far found one other person who had same problem on a punto and it was crank sensor don't know if its the same for the uno, but worth a check, clean, no broken wire etc.

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Old 19-04-2004   #6
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I replaced my Uno head gasket quite recently (TWICE - long story!). The car will definitely be hard to start initially, you need to keep turning and turning it over and then rev the cr*p out of it. I also found that when using the timing marks from the crank pulley the timing just wasn't right. The car was really dead of itself. I then set the timing using the flywheel timing mark, by setting it to zero degrees and setting the cam pulley to its normal timing mark. The car was great then. On my Uno the crank pulley was a few degrees away from its timing mark when the flywheel is set to zero degrees.

Don't be afraid to ask if you want anything clarified.

Cheers,
Shane
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Old 05-12-2004   #7
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Re: cam belt timing marks

hi there
i have a 1989 uno built in brazil and am currently stranded in peru with timing problems
alot of people seem to have trouble with the timing marks on unos
so anyone who can clearly identify all the marks for the pulleys and the mark inside the distributer cap please do
i have found a hole on the cam pulley and also a square and a red and green dot
i am fairly mechanically minded but very confused by what should be clear please advise cleraly!!
paul
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Old 06-12-2004   #8
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Re: cam belt timing marks

OK, well the pictures posted above were for a 1372cc, 1498cc, or 1580cc SOHC engine as found in some Unos, the Tipo, and the X1/9. The side-view line drawing actually depicts an early 128 saloon engine which is slightly different again! (Sorry Dave).

I thought, since it's a lovely sunny day, that I'd wander outside with my digital camera, remove 3x 10mm bolts, and attempt to clear this up once and for all!

Timing marks on the FIRE - I use the flywheel marks on the gearbox bellhousing. Turn the engine slowly and look for a long square notch in the flywheel to align with the leftmost mark as you look at the gearbox window:

The cam pulley has a fine notch in its outside surface, which lines up with a notch in the cylinder head below the cam cover join (at about 17 minutes-to-the-hour, if you imagine the cam pulley as a clock face):


Do not worry about timing the distributor, since it has an offset drive dog and should therefore fit only one way - unless you have taken the drive dog off the distributor and turned it 180-degrees by mistake. In which case, with the engine at the timing marks, the rotor arm should be pointing towards the arrow on the dust shield:

I hope you get the engine running again soon. As sterryroad says, you may have to just keep cranking (I find it's best to hold the accelerator all the way down) to clear the flooding that has probably resulted from repeated starting attempts.

Best of luck,
-Alex
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Old 06-12-2004   #9
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Thumbs up Re: cam belt timing marks

I need to replace the cam belt in my Uno 60S soon, I have been told that the belts are different between a manual or auto trans option. Is this true? I can get an after market belt for $NZ20.00 !! The Fiat dealer equivilent is $NZ80.00 !!
Cheers Bryan
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Old 09-12-2004   #10
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Re: cam belt timing marks

Brymak,
Good idea to replace the cambelt
I bought a dead Uno with a broken one... it DOES happen...
'Auto trans' - well, I have never seen an Uno Selecta in NZ! And maybe it is different... but just get a Gates belt from your local Repco, etc. for the Uno 1116cc or 1301cc.

Timing marks are NOT as shown above (that's for a FIRE) - but the flywheel mark is similar. The crankshaft pulley notch lines up with the rightmost of three moulded lines on the cambelt cover. Generally, it's easier to use the flywheel mark.

The cam pulley has a notch on its back surface that lines up with a pointer on the cambelt cover metal backing plate (just off 12'o'clock).

The third pulley drives the oil pump and distributor, and it does not have any timing mark. You will need to line up the other timing marks, and add your own mark to the auxiliary pulley and very carefully keep it lined up while fitting the new belt. Or, if you don't add a mark, you will have to re-time the distributor when you have finished (easy enough if you have a timing light).

Assess the condition of the tensioner bearing (give it a spin and listen for rumbles, and see if there is slackness in the bearing, take it off the engine to check properly).

If in doubt, you might like to get a cambelt kit (includes tensioner bearing) from your SKF bearing distributor (I assume you have one in Christchurch).

After you have refitted the cambelt, DO NOT start the engine, but instead jack up a front wheel and engage 4th gear, turn the engine over gently several times and re-check the timing AND the belt tension. Re-tension if necessary. VERY IMPORTANT! I bent a valve in a freshly-rebuilt engine when I didn't bother to re-check the tension.

-Alex
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