Question about 1994 Volvo 940

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Mechanic says that my timing chain needs replacing - but states the pistons may be bad also -- is this true

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940 engines run on timing belt. Replacement is needed as per recommendation in the manual. Your are able to check if pistons compression rings and oil rings are bad by carrying compression test, pulling out the oil dipstick while engine is idling and vapour is is noticeable coming out and opening the engine oil filler cap after stopping the engine, vapour is observed then you may have problems with these rings.

Posted on Dec 19, 2010

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2011 Jeep Grand Cherokee Laredo(160 miles)Engine makings screeching/knocking noise.Checked pulleys and removed serpentine belt and noise persisted. Mechanic stated rebuild/replacement required. Ideas?


When I read --mechanic suggest a rebuild / replacement --I always suggest to find a trained mechanic for a second opinion
The book shows that it is a 5.7 L engine EZD, EZH(vin8 =T) 2009-12 manufacture
It has a timing chain and has 1 spring loaded chain adjuster and one fixed chain guide
I suspect that the guide surfaces are worn to metal - screeching-- and the knocking is a badly worn chain just about ready to break
Get an opinion from an accredited service center that has experience on jeep products

Dec 07, 2017 | Jeep Cars & Trucks

1 Answer

Why does my timingmakes a ratteling noise


You didn't state what model car or engine, but if it has a timing chain (rather than a timing belt), the tensioner may not be working on the chain, or the chain may be stretched. Have it checked out and repaired (tensioner) or replaced (chain) soon. If the chain gets loose enough, it can skip a tooth on the crankshaft or camshaft and your engine will run very poorly, and eventually can quit running or damage the valves/pistons.

Jan 27, 2016 | Cars & Trucks

1 Answer

Issue with timing chain


HE needs to stop trying to start the engine if it keeps jumping time. Replace the tensioner or make sure the older one is installed correctly by the book. If he keeps trying to start the engine and jumping time and the cam shaft has a valve open in the head a piston can com up and hit the valve and then the valve will be bent. And you will be screwed and a head rebuild will be in your future. I have been a Certified Mechanic for over 25 years and if this guy is truly certified he should not be having this problem. Make sure he is and has the shop manual for your car. If not purchase a chiltons manual for your car specifically. May cost you $20.00 it will have the info he needs and throw it at him. A lot of times it is best to replace the tensioner when doing a timing chain repair. You already have the engine timing cover and other parts off the front of the engine. If there is any play in the bearings of the tensioner replace it.

Jul 23, 2012 | 2003 Nissan Altima

1 Answer

Timing chain was replaced but the mechanic states my valves are bad.how come he didn't detect this problem from the start of the job?


most likely he put the chain on wrong in respect to the timing and bounced a valve on top of a piston and bent them .Why were you replacing the chain as they never wear out ,the adjuster maybe but a whole new chain?? that runs in oil and should last the life of the vehicle and a bit longer .

Sep 26, 2011 | 1998 Ford Explorer

1 Answer

Looking for a 2.2 ecotec timing chain diagram with pictures


Getting the timing chain back on these engines can be tricky and requires more than just a diagram to get right. Here is how the timing chain should be reinstalled. Keep in mind that this engine can cause damage to the valves if the timing chain has any problems while the engine is running so it may not be a bad idea to setup the timing system as follows and do a compression test to make sure that everything is in order there.
Install the crankshaft sprocket with timing mark at the 5 o'clock position. Lower the timing chain through the opening in the top of the cylinder head. Carefully ensure that the chain goes around both sides of the cylinder block bosses (See 1 & 2 in picture): http://gsi.xw.gm.com/image_en_us/gif/000/000/412/412535.gif

Install the intake camshaft sprocket with the INT diamond at the 2 o'clock position. Hand tighten a NEW intake camshaft sprocket bolt. Route the timing chain around the crankshaft sprocket with the matching colored link aligning with the timing mark. Route the timing chain around the intake camshaft sprocket with the uniquely colored link (1) aligning with the INT diamond: http://gsi.xw.gm.com/image_en_us/gif/000/000/466/466558.gif

Install the timing chain tensioner guide through the opening in the top of the cylinder head. Tighten the timing chain tensioner guide bolt to 10 N·m (89 lb in): http://gsi.xw.gm.com/image_en_us/gif/000/000/412/412160.gif

Install the exhaust camshaft sprocket with the timing chain matching colored link (3) at EXH triangle aligned at the 10 o'clock position: http://gsi.xw.gm.com/image_en_us/gif/000/000/466/466570.gif

Ensure the timing marks and the colored links (1,2,3) are correctly aligned: http://gsi.xw.gm.com/image_en_us/gif/000/002/003/2003412.gif

Use a 24 mm wrench to rotate the camshaft slightly, until exhaust sprocket aligns with the camshaft. Hand tighten the NEW exhaust camshaft sprocket bolt: http://gsi.xw.gm.com/image_en_us/gif/000/000/412/412536.gif

Install the fixed timing chain guide. Tighten the fixed timing chain bolts to 10 N·m (89 lb in): http://gsi.xw.gm.com/image_en_us/gif/000/000/412/412165.gif

Apply sealant, GM P/N 12378521 (Canadian P/N 88901148) compound to thread and install the timing chain guide bolt access hole plug. Tighten the chain guide plug to 90 N·m (66 lb ft): http://gsi.xw.gm.com/image_en_us/gif/000/000/412/412164.gif

Install the timing chain upper guide. Tighten the timing chain upper guide bolts to 10 N·m (89 lb in): http://gsi.xw.gm.com/image_en_us/gif/000/000/412/412167.gif

Inspect the timing chain tensioner. If the timing chain tensioner, O-ring seal, or washer is damaged, replace the timing chain tensioner. Measure the timing chain tensioner assembly from end to end. A new tensioner should be supplied in the fully compressed non-active state. A tensioner in the compressed state will measure 72 mm (2.83 in) (a) from end to end. A tensioner in the active state will measure 85 mm (3.35 in) (a) from end to end.

****If the timing chain tensioner is not in the compressed state, perform the following steps. Remove the piston assembly from the body of the timing chain tensioner by pulling it out. Set the J 45027-2 (2) into a vise. Install the notch end of the piston assembly into the J 45027-2 (2). Using the J 45027-1 (1), turn the ratchet cylinder into the piston: http://gsi.xw.gm.com/image_en_us/gif/000/000/797/797246.gif

Inspect the bore of the tensioner body for dirt, debris, and damage. If any damage appears, replace the tensioner. Clean dirt or debris out with a lint free cloth. Install the compressed piston assembly back into the timing chain tensioner body until it stops at the bottom of the bore. Do not compress the piston assembly against the bottom of the bore. If the piston assembly is compressed against the bottom of the bore, it will activate the tensioner, which will then need to be reset again. At this point the tensioner should measure approximately 72 mm (2.83 in) (a) from end to end. If the tensioner does not read 72 mm (2.83 in) (a) from end to end repeat the steps required to return it to it's compressed state above.

Install the timing chain tensioner. Tighten the timing chain tensioner to 75 N·m (55 lb ft). Use a suitable tool with a rubber tip on the end. Feed the tool down through the camshaft drive chant to rest on the timing chain. Then give a sharp jolt diagonally downwards to release the tensioner: http://gsi.xw.gm.com/image_en_us/gif/000/000/412/412158.gif

Use a 24 mm wrench to hold the camshaft. Tighten the NEW camshaft bolts to 85 N·m (63 lb ft) plus 30 degrees: http://gsi.xw.gm.com/image_en_us/gif/000/000/630/630311.gif

May 25, 2011 | 2002 Pontiac Grand Am

2 Answers

This 2002 nissan 2400 pickup has had the timing chin replace by my mechanic. he swears up and down he did it correctly. After letting another mechanic so-call mechanic took the carburetor screws in and...


Hi, your diagram is below. Also threw in the timing marks. Not sure how hard it is to get the top cover off the timing chain as I have not worked on this engine. If you could get a peek at those timing marks you could verify valve timing. Let me know if you have more questions, and thanks for using FixYa.

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Jan 11, 2011 | 1997 Nissan Pickup

4 Answers

Timing belt broke i just readed that when the timing belt break on this car u have to replace the head cylinder coz the valve are bent is this true its 2000 daewoo laganza


True, the engines are low tolerance engines which means that there is no room for the pistons and valves in the cylinder walls at the same time. When the pistons are TDC and the valves are open, they will hit causing damage to the valves and pistons.
Be more cost efficient to replace the whole engine, rather then just the valve train redone. Chances are the the pistons will have some type of damage and it will not just be one piston that will need to be replaced.
Thank you for using Fixya and sorry for the bad news

Apr 01, 2010 | 2000 Daewoo Leganza

2 Answers

Danger of bent valve and difficulty of replacement with broken timing chain


dealing with timing chains its harder then timing belts i mean if you have the right tools it can be done but it can be pretty difficult when dealing with the timing , and the chance of a bent valves it depends if you have a 2.0L DOHC there is definatelly a pretty good chance that u might have valve or piston damage, if you have 2.0 SOHC u wont have damage at all

May 28, 2009 | 1998 Mitsubishi Eclipse

1 Answer

My 1990 nissan sentra has a noisy timing chain when running idle.


Your timing chain tensioner is using oil pressure to stay tight.Could be your oil pressure is so low at idle the tensioner just can't stay tight.At the next oil change you could go for a thicker oil and see if the tensioner keeps the chain tighter at idle.

May 05, 2017 | 1990 Nissan Sentra

1 Answer

94 lincoln town car timing chain prob.help!


First, the timing chain runs from the crank around the gears on both cylinder heads. There may be 2 chains. What it does is keep the closing and opening of the valves "in time" with the compression and exhaust stroke of the combustion chamber (pistons).
No compression on the entire left side is not good. If right side is okay then you have 2 chains one for each side. Left side chain must be broke or damaged.
To check the compression without using air , someone had to turn the crank over. If this was done with a bad or broke chain you may have bent valve(s) as well meaning cylinder head rebuilding or replacement.
If you plan on keeping the car for a while consider replacing or rebuilding the engine.

Nov 12, 2008 | 1994 Lincoln Town Car

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