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[JamesV6CDX]

Some of you may remember me asking for some bits of information, when I was helping a friend from work repair his engine following a cambelt failure. Well in the end, we changed the head, fitted a new cambelt kit, and all was well again.

The car has been used for a few months, but recently went into a garage for some work. The garage  believe that the valve timing was one tooth out.

Now, I'd been up for a stupid amount of time when working on this, so It's possible I made a human error. However, rare, and doubtful, because I always double and triple check timing/tensioner marks.

My thinking is this - on the small block multivalve Vauxhalls (as fitted to the 1.4 16v corsa) - the timing is a little different. Whereas most cars require the notch on the crank pulley to be at 6 o clock for the engine to be at TDC, these particular engines require the crank notch to be at approx 5 o clock for TDC.

I'm just a little concerned, that the mechanic may have seen the crank notch not directly at the bottom, with the camshaft markings lined up, and wrongly assumed therefore the timing was a tooth out on the crank?

Therefore, possibly I had it right first time, and he now has it one tooth out?

Any thoughts?

[IrmscherKris]

I thought they were 1pm @ tdc on them  

[JamesV6CDX]

I thought they were 1pm @ tdc on them  

That would be 150 degree's too retarded  

[Dazzler]

Lower timing mark is about 5.25ish and the cam marks should face each other 3 and 9 o'clcok, lower mark has a corrisponding mark on the timing cover casing to align to.

[JamesV6CDX]

Lower timing mark is about 5.25ish and the cam marks should face each other 3 and 9 o'clcok, lower mark has a corrisponding mark on the timing cover casing to align to.

Yep, that's my understanding too, and the princiiple I used to time it up.

Sooo... I wonder if he's got it at 6pm?  :-/

[Dazzler]

Lower timing mark is about 5.25ish and the cam marks should face each other 3 and 9 o'clcok, lower mark has a corrisponding mark on the timing cover casing to align to.

Yep, that's my understanding too, and the princiiple I used to time it up.

Sooo... I wonder if he's got it at 6pm?  :-/

That would be at least 2 teeth out then

[JamesV6CDX]

Yes... but do you see my thinking? Could I be right?

[Dazzler]

I do but i would have thought that any garage undertaking cambelt changes would at least have an Autodata cambelt book which will clearly show where the timing marks are :-/

[RonaldMcBurger]

Bottom line here, is that if the engine starts, drives and sounds perfect, plus is returning appx 38mpg average, it is spot on. These are great engines and will not run well if the timing is out.

[Marks DTM Calib]

Sounds liek a screw up on the garages pat to me.

I assume the engien is running and pulling fine, a 1.4 16V corsa is normaly quite 'sprightly'! (with the exception of the Corsa D where they have screwed up the gearing and made it MUCH to long)