Engine Vibration Unknown Cause

[Guest xsaraiihdi]

Hi All

 

I have a 2002 C5 2Ltr Estate with just over 100K on the clock. I purchased it with a suspect head gasket fault as it pumped water out of the header tank.

 

I removed the head to reveal that the head had very bad corrosion around the water ways so I purcheased a recon head, head gasket set and new head bolts.

 

All went well and the engine running nicely. Then last week I put £30.00 worth of good diesel (not supermarket) in shortly after the engine has now developed a nasty vibration at 1000 rpm which goes through the whole car.

 

I have spoken to a mechanic friend of mine and carried out a scan for any fault codes (none found). I have also removed the alternator belt to rule out any problems with the alternator, power steering pump, air con pump and pullies but made no difference. I have also checked the Crankshalft pulley and this appears to be all OK. Thier are no unusual sounds coming from the engine or gearbox.

 

Has anyone had the same problem?

 

Many Thanks

[Guest xsaraiihdi]

Hi All

 

Any idears please

 

Many Thanks

[paul.h]

Is it easy to check if the timing belt is still set up correctly and not jumped ?

[Guest xsaraiihdi]

Hi paul.h

 

Thankyou for the reply,

 

Rechecked the timing belt shortly after the vibration appeared. Timing spot on The vibration appears at about 1000 rpm then seem to smooth out at about 1750 rpm. I have tried cheaper fuel no difference. The virbration seems worse on some days and not as on others. I have been told it could be the crankshalf pulley, dual mass flywheel or even am imbalance in the fuel injectors. All expensive to go changing only to find out that is not the cause.

 

Many Thanks

[GreenBlood]

Hi paul.h

 

Thankyou for the reply,

 

Rechecked the timing belt shortly after the vibration appeared. Timing spot on The vibration appears at about 1000 rpm then seem to smooth out at about 1750 rpm. I have tried cheaper fuel no difference. The virbration seems worse on some days and not as on others. I have been told it could be the crankshalf pulley, dual mass flywheel or even am imbalance in the fuel injectors. All expensive to go changing only to find out that is not the cause.

 

Many Thanks

 

I'ts hard to diagnose remotely, so can only offer sugestions...

The crakshaft pulley would normaly make a bit of noise if it were failing (rattle/ chatter), best way to check if it is a problem is to run a mark with a white tippo pen or similar across the inner metal, rubber and outer metal that makes up the pulley, run the engine and check to see if the marks stay in alignment.

 

Removing the belt may not give a good indication of the alternators condition, on some C5s the alternator may be a clutch type, the pulley on these should only turn in one direction (I beleive) but if it is suspect it may only produce symptoms once certain rpm are acheived...

 

Another thing to look at would be condition of engine/ gearbox mounts, failing mounts could give you the symptoms you describe?

 

Cheers

Chris

 

Edit: Just noticed your username - we are talking about a C5 here, yes?

[coastline taxis]

Does the vibration happen when standing or driving or both

[Guest xsaraiihdi]

Hi

 

Thank you for the replies.

 

Yes it a 2002 C5 2ltr 8 valve HDI Estate engine code RHZ.

 

I will try your suggestion with the white marker tomorrow.

 

The vibration happens whether stationary or moving.

 

If I coast the car once the rpm drop to tickover thier is no vibration thus ruling out the drive shafts

 

Alternator belt has been removed and the engine run but vibration still thier. Engine mounts checked one replaced when new head fitted.

 

Many Thanks

[coastline taxis]

My next step would be to plug the car in go to live data and see what the injector are doing when the vibration happens. Do you no if the fault was there when you bought the car or has it just appeared since the head was done

[Guest xsaraiihdi]

Hi All

 

Car has been checked for faults using Lexia 3 none found. Tow injectors do have a 2 or 3 percent larger leak back than the other 2. I do not know if the fault was there befor the head was changed as the car was a none runner. I know the thickness of the head gasket is governed by the protrusion of the piston above the surfice of the block. This was checked to see if the where any discrepencies. None found so no bent conrods.

 

Many thanks

[coastline taxis]

Any smoke out the back when it vibrates

Have you checked the leak off pipes and seals

is there any air getting in the systen

 

Also where they just looking for fault codes on the lexia or did they go into live data/graphing and see what the engine is doing when its running

[Guest xsaraiihdi]

Hi

 

Sorry for the lateness of the reply but could not get in the forum earlier.

 

No smoke and the live data showed no problems. Unfortunately I did not get the chance today to check the crank pulley so hope to do it tomorrow. I will let you know the resault.

 

Many Thanks

[Guest Bendk]

Hey pal.

Could sound to me, like your valves could use an adjustment.

I have been searching the internet for a while now without any result of valve adjustments.

You could take the car to a certified Citröen dealer and make them try to adjust it.

This is done with seeker blades. They come from 0.05mm to 1.00mm.

Injection- and exhaust valves should be different. I believe that it's 0.35 for injection and 0.40 for exhaust.

The 2002 Estate I believe is a DOCH (Double overhead camshaft) with eight valves on each. Two injection and two exhaust valves per cylinder.

 

 

How to adjust: Get an either 16 or 18 wrench. Down at the crankshaft at the left side of the motor their should be a nut which should drive your camshafts with a belt.

Turn this either clock- or counterclock wise, until the valves start to go up and down. Remember to remove valve cover.

Now the ignition order should be 1423 if I'm correct. Ask a person who knows what it is to be sure!

Now when valves at the cylinder goes down at cylinder one, you can adjust the valves at cylinder four and vise versa.

Remember to only adjust injection valves if aforementioned valves are going up and down at the partner cylinder.

 

Best help I can give.. Try to ask your friend for help.

 

Good luck, and please write back if it works or not.

 

Regards,

Ben.

[Guest xsaraiihdi]

Hi Ben

 

Thank You for the reply

 

But this engine has hydraulic valves and as far as I am aware cannot be adjusted.

 

Will Keep you posted

[coastline taxis]

Think your best bet here would be to use up the diesel youve got in. Then fill it up a different garage and put some injector cleaner in the tank and take the car for a got run making sure you really work the engine hard and then see what its like

[Guest xsaraiihdi]

Hi Coastline

 

Since this problem has occured I have refilled the tank twice if not more with cheaper desiel but still has the same problem. I have taken the car over to an injection specialist and he gave the fuel system a clean bill of health, He suggested changing the the crank pulley if that fails the change the dual mass flywheel.

 

Many Thanks

 

Mark