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Hi i got a mondeo st24 and think my cam chain tensioner is on its way out and have been advised its easier to fit a new engine is this the case or can i get it fixed

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Yes I'm afraid it's easier to fit another engine in than replacing the chain in place. It can be costly to do replace the chain.

Posted on Apr 20, 2009

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2004 passat engine sounds like a deisel all of a sudden and has some engine lag


Hi, depending on engine fitted it is most likely the cam chain tensioner has collaped or failed. On a twin cam engine like a 1.8 t or a 32 valve V6 there is a chain driving a second chain in the rear of the cylinder head. These chains are tensioned by a oil pressure pressurized piston pushing on a bridge under the chain.

If it collapses, the chain/s become very loose and you will hear a loud clacking noise. It can also collapse due to low oil pressure.

VW is familiar with this problem and the repair involves first checking oil pressure, cold thro' warm. If it is around 85 to105 psi cold and 28 to 35 psi warm at idle, then this indicates tensioner piston is faulty or tensioner guide has broken off.

If oil presssure is good and engine is running synthetic oil...as it should ...then tensioneris suspect. I have also seen these engines with the screen under the tensioner partly blocked . If on removal of valve cover prooves tensioner has collapsed or guide shoe broken or warn then a new tensioner must be installed.

If oil pressure is too low at under 12 psi at warm idle then oil pump is worn and/or engine is worn. Also low oil pressure can be caused by fuel in the oil making it very thin.

If the screen under the tensioner is partly plugged up, then the oil pan must also be removed and cleaned out otherwise plugging will happen again.

To remove and install the tensioner a SST ( Special Service Tool.) is required to compresse the tensioner piston to allow it to be removed from under the cam chain and again compressing the new tensioner to be installed. Cams or chain do not need removing on this job.

Most import shops can handle this as long as they are equipped with the SST tensioner tool.

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Timing Chain Failure - Can there ever be a case where there has been no permanent damage to the head.


You may be in luck! your engine may have a squash plate on the heads. This will keep the valves bending. Put the new chain on it-MAKE SURE THE TIMING MARKS LINE UP! Then do a compression test to be sure. I've had a timing belt break at 10 miles over the "suggested " change mileage, and that plate save the day.

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I'm looking for a diagram of the timing chain and timing marks for mondeo st 220?


Duratec ST-220 used in the top of the line Mondeo 3.0 liter V6.

The original Duratec V6 was introduced in Europe in 1993 in the Ford Mondeo (Ford Contour/ Mercury Mystique in NA). Then in 2000 the smaller 4 cyl Mondeo engines also got the Duratec name, as well as others. Check this for 3.0L 6cyl...


2_15_2012_8_32_29_pm.jpg

Fig. Be sure the timing marks are as shown after the chain has been installed-2001-04 3.0L (VIN S) engine ( zoom link here )

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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1 Answer

I have a Mitsubishi Pajero NM 2002 3.2lt diesel timing chain


I checked out the pajero forum, they don't mention the bottom tensioner as being the noise maker here but rather a sloppy chain, stretched beyond the tensioner and riding on the guides. The noise sounds like it comes from the fan area as a metallic chattering. They sell a chain that has a master link in it, and you don't have to tear down the entire engine again to get to it, just the top cover,, Cut the old chain, and use it to pull the new one through. Also, if your chain did jump its gear, it would only be a matter of 8 - 10 miles before the cam breaks. Hope this helps.

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1 Answer

Knocking noise from top of engine. goes sometimes when you rev the engine. all cam shafts and tappets ok and no vibrations. seems to be from right hand side of engine?FORD MONDEO 2.5 v6 st24. 1999model


hi have you checked the oil pick up pipe in the sump they have a metle gauze type filter at bottom of pipe which can get blocked restricting the amount of oil getting to the top end of the engine regards

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How do you release the tension on the timing chains for the camshafts. i'm changing the head gaskets and can't figure out the timing chains tensioner. please help.


there are two large bolts in timing casing area 32mm size, one tensions cam chain the other tensions intermediate shaft chain, make sure engine is pinned in crank pulley to lock engine before releasing tensioners

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My 1998 r reg st24 engine has developed a loud


It sounds to me like you havent got any oil in it.

Cheers,

Toon.

Oct 01, 2009 | 1997 Ford Probe

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2004 beetle changed head gasket. put back together running real rough and wont go over 2000 rpms


hi thanks for update the engine would run rough ifvalve timing was off a tooth however if in doubt ? recheck ! whenever you fit new belts or change always fit and work anticlockwise from the crankshaft ! this ensures the crank and cam side of belt and or chain is tight with the cam and crank t d c marks are aligned before you fit to other cogs and round tensioner did you compression test ? this also would verify lower comp's on each cyl due to valves not timed ie inlet+exhaust out of cynk ps do not ev engine too much just in case this is problem

Sep 06, 2009 | 2004 Volkswagen Beetle

1 Answer

Eninge knock with a known cam gear problems.


i had the same problem. had a knocking on the engine and let the vehicle sit until i had time to look for the problem. my unknowing mom took the car without permission and the car broke down on her. as it would turn out the upper timing guide rail broke off and damaged the cam gears and broke the upper timing chain along with damaging both the right and left lower chain guides, and the tensioner was also damaged. i would recommend that u inspect the lower chain to make sure that everything is good.

Apr 09, 2009 | 1999 Suzuki Vitara

4 Answers

Im changing head gasket on 1988 mitsu triton 2.6.have the head back on and i had the cam chain wheel under tension but i think it has slipped.i kept the cams and evrything in place nothin has moved cept...


a good idea to keep stuff from slipping is to put zip ties on the chain and cam gears so you dont have to question if it slipped or not,i would recommend finding the tensioner,relieve the tension and see if you can get it back on,it might not have slipped,just when you loosened the gears and took them off,the tensioner went full tension and its probably too much to just force the gears back in place-

Aug 12, 2008 | 1986 Mitsubishi Pickup

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