v6 timing

Why do you think your timing is out Captsensible, have you or someone just done a big job and now it wont start, or has it just stopped etc, as if its just stopped it would be very unlikely any thing to do with timing as in ' slipped ' unless you have had a failed on one of the cam shafts etc.

Again you need to see the faces of the cams to see if your timing is Wright, look at my post I done years ago to know how to check or do the timing on the v6:

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You could take the rockers off make sure there is no lobe or cam damage, and remove your plugs and see which piston is a TDC at the time and see if your lobe’s are not pushing down on the valves etc but this would not really show up a minor timing fault etc.

You say it wont start have you checked the simple things first like do you have spark, and fuel.

Any more info you can post?

Ryan.

Hi, the reason that i want to check the timing, without a complete stripdown is because i thought my chain(s) had snapped.
what happened was i was getting a juddering from the car as if it was misfiring, then one morning i went to start the car and just before it fired, there was a crunching noise then the car made a whirring sound,simalier to a snapped cambelt. I have removed the front cover and sparkplugs and the chains look tight and ok also the sparkplugs were not damaged, when i turn the engine by hand there is no tight spots so i thought it must be something else so rebuilt it back up.
When i went to start it, it was turning over but would not fire, so i tried one of the old spark plugs and there waqs a bright spark.
I then took the caps of the battery and found that the first and last cells were dry so filled them with distilled water, i am thinking that the battery may be out its way out but don't really want to take it off the car as i don't want the ecu to be wiped out in case the is a fault that can piont me in the direction of my non-starting.Sorry if this is long-winded

Captsensible said:

Hi, the reason that i want to check the timing, without a complete stripdown is because i thought my chain(s) had snapped.
what happened was i was getting a juddering from the car as if it was misfiring, then one morning i went to start the car and just before it fired, there was a crunching noise then the car made a whirring sound,simalier to a snapped cambelt. I have removed the front cover and sparkplugs and the chains look tight and ok also the sparkplugs were not damaged, when i turn the engine by hand there is no tight spots so i thought it must be something else so rebuilt it back up.
When i went to start it, it was turning over but would not fire, so i tried one of the old spark plugs and there waqs a bright spark.
I then took the caps of the battery and found that the first and last cells were dry so filled them with distilled water, i am thinking that the battery may be out its way out but don't really want to take it off the car as i don't want the ecu to be wiped out in case the is a fault that can piont me in the direction of my non-starting.Sorry if this is long-winded

Click to expand...

The trouble is if it has slipped has any damaged been done, i was working on a mgf few weeks ago doing a full rebuild new pistons big ends etc etc due to a none starting prob, it turned out the roll pin that locks the cam sprocket in place had slipped and kinked a inlet and ext valve on cylinder one and just would not go, if this could be the same type of prob maybe?

All so do what Terry says and count the links round the sproket but for a chain to snap this would be a first one i have known to go, more chance of a slip due to a tensioner fail.

If you are getting a good spark and fuel from the injectors, and your car stopped working and there was a crunch there could be a good chance something has gone.

If so i would remove all ht leads, remove one spark plug at a time and place a compressor gauge and crank the engine at W.O.T and make sure you have psi in all cylinders, if you are reading 0psi on 1 or a few this could indicate you slipped and dinked a valve, if not.....

i would be looking at removing a few this like crank pulley, engine mount etc etc so you can remove your side v cam chain cover off the side of the engine, and the rocker cover and check your timing from there.

I know when your v6 goes to start the hydraulic chain tensioners do rely on a stiff spring to hold the tensioner tight on the chain until your oil pressure has built up, maybe this has failed and caused it to slip on both or 1 cam bank maybe?

Have you got ok oil pressure as well so the oil can hold the tensioners ok?

Just trying to work though a few things to get a better idea as its hard to explain the things i would try without seeing the cars engine etc, please rely to my post to see if any of the above makes any sense.

Ryan.