Question about Jaguar Xj Series

1 Answer

Has no compression but the cam chain is not broken!

Posted by on

  • vands296 Jun 04, 2011

    Sorry but my original claim had more than enough info I would of thought! Start engine, engine stops after engaging drive, select park to restart, NO COMPRESSION ON ANY CYLINDER!!! a day later, after cranking and waiting for all cylinders to refire a total time of about 5 mins, the car has been running fautlessly since, comps test ok with a 13 lb variation over all cyls, has the same amount of torque and revs as it did before without a hint of blue smoke nor fumes from crankcase pressure! go figure!!!

×

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 49 Answers

Loss of compression can be due to a bent head, bent valve not closing all the way, bad head gasket, hole in the piston, dropped piston, bad or broken piston rings, compression checked on cylinder with valve in the open position.

Posted on May 29, 2011

  • vands296 Jun 03, 2011

    Well that answer was of no use as my description of the ailment may not have been read properly, my XJ6 X300 series had no compression on any cylinder after idling in the driveway for about 15 seconds, but cams were operating as designed, compression returned several days later by my insistant cranking (at the risk of a starter motor) over a period of some 3-4 minutes as 1 cylinder at a time came back into compression! this continued for a further 2 odd minutes untill I got the engine to red line finally firing on all 6 cylinders, the issue is however, that no reasonable answer can be found nor given to something of a completely mechanical nature, foot-note to all this is the fact that I now have no answer to this temporary failure in compression leaving me with an unreliable motor-car! I have rebuilt countless types of engines in my 50 years and have not until now witnessed anything like it! absolutely no rhyme nor reason! Disappointed, Kiwi Steve

  • vanyell Jun 04, 2011

    This was the entirety of your question,

    "Has no compression but the cam chain is not...

    By vands296 on May 29, 2011
    has no compression but the cam chain is not broken!"

    Everything else that you have stated in your reply was not given in the original question but since you decided to add more details then I can give an answer as to what you may be dealing with.

    First all of the above still holds true outside of checking the compression on a cylinder with a valve in the open position, that aside if your cranking the car over and over then your creating friction in each cylinder and heating up the cylinder walls as well as the piston rings and pumping oil through the system slowly but still getting it into each cylinder. It stands a good chance that piston rings are extremely worn to the point of not being able to hold compression in the cylinders while the engine is cold and there is little or no oil acting as a secondary sealer in the cylinders. Loss of compression on all cylinders generally indicates a blown head gasket(s), worn piston rings or catastrophic failure of the engine block or heads which could be caused by overheating which could be caused by a blockage in the cooling system or a failure of the oil pump to deliver oil as designed to the internals of the engine.

    Word of advice, when you have a problem and you are looking for help it is a good idea to include details in your question which in your original question you failed to do.

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Bmw e39 m54 engine defective cam sensors make car impossible to start because very low compression>


Lots of guesswork here.
Firstly, have you checked for compression on all cylinders.
If compression is low or non exisistant then you have a major problem probably caused by the timing chain slipping and causing damage to the valves /pistons etc
I would do this first.
Roger

Apr 24, 2017 | BMW Cars & Trucks

1 Answer

My jaguar x type not got compression had pugs,coils, and injections checked, had 2 mechanics look nether know what it could be


if you have no compression then that means that the pistons are not compressing the air fuel mixture on the compression up stroke
This means several things
valve not seating or sealing ---bent valves
valves not opening --- broken chain/belt
rings broken-- holes in pistons
badly warped head/s and destroyed head gasket/s
check to see if the cam shaft/s is turning,
have a compression test ( dry and wet ) done by an accredited mechanic-- mechanics that do not know why there is no compression may not be mechanics ---to see exactly how much compression you have and on what pistons.

May 14, 2015 | Jaguar Cars & Trucks

1 Answer

1992mazda bravo ute has no compression


check that the cam shaft is turning ( broken belt/chain)

Mar 28, 2015 | Mazda Cars & Trucks

2 Answers

How can i check to see if the timing chain is the problem?


The cams will not turn if the timing chain is broken. there is no carb on this year explorer. It is fuel injected. The throttle body just controls the air flow and the fuel injectors meter the fuel in the intake manifold.

Jul 14, 2014 | 2004 Ford Explorer

1 Answer

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.

Nov 01, 2013 | 2003 Volkswagen Passat

1 Answer

My car shut off while driving, computer codes are P0562, P0340, P0700, P0016 I need help


P0016 is for camshaft/crankshaft misalignment. You should check and verify that the timing chain is still intact and that the cam/crank timing is correct. If the engine is cranking really fast and does not sound like there is compression, it is probable that this chain/chains have jumped &/or broken.

Sep 14, 2012 | 2006 Dodge Stratus

1 Answer

How do i check to see if the timing chain is broken?


If the chain is broken the cam or cams won't move, so the valves won't either. The engine would crank like the spark plugs are out - no compression.

Jul 16, 2012 | 2005 Volkswagen Jetta

1 Answer

1993 Grand Am jumped timing. One valve is showing over 200 lbs of compression, the other three are showing none. Any suggestions.


I've had a few of these engines break the cam shaft after cylinder #4. meaning #5 & #6 have no compression, but also no oil pressure due to no oil pump drive from cam shaft. 2 out of 3 times the engine was toast. If it truly skipped the timing, then you will need a timing chain and sprockets. When the timing skips or the cam shaft breaks, the pistons will definitely hit the valves and bend them, thus no compression. I'd recommend tearing down the engine yourself and determine what went. To check the cam shaft, remove the front valve cover and watch the rockers for cylinder #6, if they don't move then broken cam shaft.

Jan 29, 2011 | 2000 Pontiac Grand Am GT

1 Answer

Engine quit and won't start.


You may have an ignition, fuel delivery or compression problem.
1. Check for spark first. If there's no spark, you may have a failed ignition module, ignition pickup, ignition coil or open in the ignition circuit (bad ignition switch or neutral safety switch).
2. If you have spark, check for fuel. On carbureted engines, remove the air cleaner, hold the choke open, look down the carburetor throat and work the throttle linkage. If you don't see any fuel squirting into the carburetor, the problem may be a stuck needle inlet valve in the carburetor, a bad fuel pump, a plugged fuel filter, a plugged or frozen fuel line, an obstructed fuel tank pickup screen, or no fuel (or water contaminated fuel) in your tank.
3. If you have spark and fuel, your timing chain or belt may have broken or slipped. If your engine has a distributor, remove the distributor cap and see if the rotor turns when the engine is cranked. No movement would tell you the timing belt or chain (or possibly the cam itself) is broken. Another alternative is to remove the valve cover to see if the valves are opening and closing. This too will show you if the cam drive or cam is broken.
If a cam belt or chain has "slipped a tooth," throwing valve timing off, the valves will still open and close, and the rotor inside the distributor will still turn. But the engine won't develop enough compression to start. A compression check can help you find this kind of problem.

Sep 05, 2009 | 1990 GMC C3500

2 Answers

1999 chevy s 10 doesnt have compression


You could have a burnt valve if there is no compression in just one cylinder. It could be a broken valve spring. It could be a hole in the piston. If you have no compression in all the cylinders then most likely it's cam timing.(chain jumped).

Mar 13, 2009 | 1999 Chevrolet S-10 Pickup

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

245 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jaguar Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

yadayada
yadayada

Level 3 Expert

76164 Answers

SPEEDY CAR WORK SHOP...

Level 2 Expert

489 Answers

Are you a Jaguar Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...