Timeing ive taken my rockethead off check'd the valves. and another thing was my cambelt only slid off it never snap'd. cambelt is worn but thats about it i need help asap honda accord 1994 exis

If the timing belt snaps, they run into each other, causing bent valves (most common), cylinder head or camshaft damage, and possibly piston and cylinder wall damage. ... In a non-interference engine, the pistons and valves don't occupy the same space, so if the timing belt snaps, no valve or cylinder damage occurs.
nissan are all Interference engines

There is every possibility that there will be valve damage from the valves hitting the piston crown
IF the belt has already snapped the manual will state it the head has to come off for repair
If it hasn't yet snapped and you are in the 60,000miles or 100,000k bracket , have it done to save the extra cost of repairs

it depends on the design of the engine. Some are designed so that the valves are unable to contact the pistons in the case of a cam belt snapping, others are not.

pinging in the engine is detonation caused fro wrong air fuel mixture for the accelerator opening and engine load. It is controlled by knock sensors that adjust the mixture in the CPU .IT has nothing to do with valve timing but may be affected by ignition timing . I would be having a compression test done to check for bent valves ( bent during the belt replacement). Have the cam timing re checked as it may be still out a bit.

Hi guys, I just want to now if someone can tell me if a hyundai getz 1600 16v 2004 can bent valves if the cambelt snaps. I did put a new cambelt on and tensioner. It start but misfiring and a soft tickking noise from the head. Hope you can advise me please. Thanks

yes it will and most likely put a hole in the piston and snap the cam shaft if the engine is doing any more than idle speed, if it breaks at idle you may be lucky and just get away with a few bent valves but if im honest ive never seen anyone be lucky with one the normaly require a new engine. also worth changing the water pump at the same time as these do seize and will snap the new cam belt ! the only belt you can get away with leaving is the pump belt if this breaks no damage is caused the engine will just cut out ! however you will need to pretty much remove it after fitting a cambelt to set the timing so its pretty pointless no to change it

hi i have a 307 2.0 petrol on a 05 plate how do i time up the bottom end of the engine it has no timming maksand its a free wheeling crank many thanks kev

The garage will say that they only re-built the head and will only warranty that part.
However they have a duty of care to check that their work covers all aspects of the work quoted for.

Note
Problem is that when a cam belt snaps it can drive two parts of the engine together (Valve and Piston Crown) which sometimes you get away with having a new Valve fitted and other times it puts a hole or a crack in the top of the piston.

This could explain your blue smoke as oil is being burnt off down the exhaust as oil is being drawn into the cylinder.

If the oil level gets too low pressure drops and you can get bearing failures which can lead to con rods snapping.

It is not normal for blue smoke to be emitted after a cylinder head rebuild !!

If blue smoke comes out of the exhaust there is oil being burnt off because of a mechanical problem.

If it is a professional garage they may come to an agreement with you , if it is a hole in the wall then your chances of redress are slim

you mean the timing belt..well you can bent your valves if your not lucky mostly engine running with interferance ingine but yea if your timing belt snap it can damage your valve timing belt should be change at every 60k miles or suffer later..

You need to rotate the cam until timing marks on the sprocket are in line with the head, then make sure crank shaft timing mark is lined up. Install the belt. Might have to loosen the timing belt tensioner. Put timing belt tensioner back on, rotate the crank shaft with a wrench first to make sure there's no interference. Next, check compression.