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Re: timing chain jumped two teeth on renault traffic
Reset the cambelt in position and tension, then do a compression test before wasting money on sorting a new cambelt it maybe cheaper to get a replacement engine than rework the head. please ask a more direct question if you need more info
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These things cause it:
Bad spark plugs? Coil pack? Fuel filter dirty.or pump bad? Bad or old fuel,fuel with water? Water on the plug wiring or on engine?
HOPEFULLY,it hasn't had a timing belt jump the teeth.How many miles on the timing belt if it has one.It may have a timing chain,which is unlikely to fail.
2 questions come to mind has the new sprocket got the same pitch ( distance between teeth ) as the crank shaft sprocket as this will make the chain jump out after a few degrees of movement. A quick check is to wrap the chain around the sprocket and see if there are links that do not sit fully around the teeth. There are different pitches for teeth and chains ( BA-- AM and metric)
Look for some Youtube videos on this repair. If I remember correctly the links on this chain have different color metal for the spots that the cam tooth goes against. When each side is in the proper tooth the right and left colored links will be on the cam mark and the crank mark should be on the timing TDC mark. Sounds like the slack you describe is wrong and a tooth is off because the tensioner is allowing slack.. You need to slip a tooth one way or the other until the tensioner has room to be in a neutral position.
A car with a timing belt will jump time for several reasons, the belt dries out and the teeth strip off the belt, the tensioner or guide wear and fail, the belt can stretch over the years causing it to jump the sprockets. A car with a timing chain can jump because many were made with cam gears that had plastic teeth and they wore out, or the gear was made out of a casting that wore out, or the chain stretched replacement cam gears were usually made out of steel. Bob Bristol Magic Collision
Essentially, since the valves and distributor are both driven by the camshaft (via the timing chain), both are equally affected by anything that happens to the chain. Chains don't actually "jump time" but most often will stretch out and cause the cam and distributor to lag behind the crankshaft so the pistons are out of phase with them. That causes lower and lower actual compression and later and later spark, resulting in poor power output and in extreme cases, a piston can actually touch and bend a lagging valve. If an engine is fitted with an aluminum cam gear, the gear teeth are nylon. As the gear turns, an excessively worn chain will ride up and strip off the teeth. The best way to check is to remove the valve cover and watch the rocker arms on #1 cylinder. Both valves should be completely closed when the engine is turned to the top dead center (0) position on the timing scale and the distributor rotor should point to the #1 tower on the distributor cap. (will also point exactly 180 degrees away from it if on the exhaust stroke) Very low compression readings in all cylinders and a rotor that "stutters when the engine is cranking are other common symptoms) If you have those symptoms, the next thing to do is remove the timing case cover and look at the chain. if the engine has 200K miles or better, I'd replace the chain, as at that point, most chains have sufficient wear to justify replacement even in engines that seem to be running well. This answers your question but may not solve your problem as your post leads me to believe there is something other than a valve timing issue going on there.
The Renault schedule for timing belts on the Scenic is 72,000 miles or 5 years. This applies to both the petrol and DCI models as both have timing belts not chains.
However, please be aware that it is common knowledge in the trade not to let the interval go past 40,000 miles because these engines are renowned for snapping belts at any time after 40k resulting in serious engine damage.
Haynes (who are renowned for their service manuals on many models) recommend a maximum interval of 36,000 miles between belts on this model which is exactly half that of what Renault say!
This information from Haynes is backed up by experience and reports from the trade on the common and unfortunate experiences of customers experiencing belt breakage at 45 k and below.
Hope this helps. Please do leave a vote for the solution. Thanks.
I had a timing chain problem, It made a noise for about 3 years and it decided to break last May, the engine just totally stopped. My 99 cavalier had 164,000 miles on it. My friend and I found out the the cavalier 2.2 eng. has a non interfer timing chain. so when my timing chain broke it didn't cause any damage.
Since you are getting spark and fuel we know you are good there. Check the timing on the engine. Turn the engine from the front of the crankshaft with a socket and a large breaker bar until you reach top dead center of the intake stroke. Then remove the distributor cap and check to make sure the rotor is pointing to the # 1 cylinder. It almost sounds from your description of the sound the engine is making that the timing chain has jumped a few teeth on the gear. These factory gears have a nylon coating on the teeth and over time the nylon chips off the gear. When to much of this plastic gets chipped off the teeth it results in chain slack on the push side of the gear. When you shut the engine off it can jump a few teeth at the very last second before the engine stops rotating the crank and cause it to jump teeth. The engine probably has high mileage and might need the timing gears and chain replaced now. If you perform the visual check with the distributor I think you will find the chain has jumped a few teeth. If you need more help come back to this site and one of us will be glad to help. Good luck. Let me know what you discover.