J

jerf

Member
Any help with this one? I have a 2.5 n/a which started making quite a loud noise. Checked oil and noticed it was blow min (no light on)

Anyway, topped up with oil and the noise is still there. Initiually thought it would be big ends/mains worn due to lack of oil but I now think its coming from the top half on the engine/block.

Took the rocker cover off and noticed gasses coming up through the push rod hole - ah - head gasket has gone I thought. Sorted this out, didn't notice anything else wrong with the rockers etc. Put it all back together and it still makes the noise. How do I diagnose this further? Its not the vaccum pump as i removed this for a second (probs a bad move) and it still made the noise. I have loosened the injector pipes to knock out cylinders and this doesn't seem to make a difference to the noise.

Next thing is head off to look at the cam followers???

Many thanks

Jeremy
 
How would you describe the noise?? Knocking, whiring, cloncking, grinding etc. Might help if we knew:rolleyes:
 
providing oil light working the fact it didnt come on means there was enough oil even if low,all red blocks are prone to bore / ring wear,which will be were pressure in crank case will be from ,feel rockers when engine running is valve train worn /sticking,is noise engine speed ie crank brgs or 1/2 speed cam etc
 
Thanks for your replies. I'd describe it as a heavy ticking - I get funny looks from people when I'm driving along its so loud.

The 'tick' is happening once per cycle/ 1/2 crank speed or cam speed but I guess this could still be big end on power stroke?

There is no noticeable side/twist movement on the rockers and once the carbon was removed from the top of the bore, there was no significant gap. It does smoke though and uses oil - pint every 1000 miles but not sure how much of that is from various leaks. If I push down on the rockers when running, it doesn't change the note.

What is sticking - is this the cam followers or valves in their guides - I haven't checked that? I didn't take the valves out when I did the head gasket.

Would it be worth removing a pushrod, one at a time to see if that helps? Bit of a pain as would have to remove the rocker assembly each time I think and not sure if it would dislodge the followers?
 
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thers a rooler that can loose hard facing that runs on cam ,a brass follower that can jam/stick in guide,and socket push rod sits in can wear with end of push rod too,bore would be most worn on side oppposite push rods about 1cm down with no wear at all on front and rear of bore,rocker pad prone to wear too were it touches valve ,little ends more noisy on overrun,if it was bottom end it wont belong before your sure
 
Thanks. So if I take the head off and look at the roller/brass followers, I should see one that is obviously different or could it be the cam lobe that is damaged. The ends of the pushrods were not smooth as I remember. What can be replaced here as the rocker/valve/pushrod and brass follower are matched so the whole lot would need replacing?

The ticking noise started quite quickly as if something failed rather than wore. I drove home with it one day, and the following morning on startup, the noise was there.

Could the oil pump/fuel lift pump make this noise on the cam?

I've been offered a low mileage Disco 200 for £450 but recon on over £700 including all the conversion/missing bits - is it time for the phone call. I can't really afford it but also can't afford to be without a car.
 
you should be able to feel it when engine running under fingers,oil pump is driven from skew gear below the drive for vac pump
 
Right, I checked the rockers with the engine running - pressing down on the rocker both sides and I didn't notice anything and no change to the noise. I've now got the head off again to remove the cam follers and they seem to be very clean and shiny - I haven't turned the engine over but the cam lobes I can see look fine too. This is getting very frustrating.

There is only a small ridge in the cylinders at the top of the bore - when all pistons in the middle, I can rock them say 0.5 to 1 mm side to side.

What can I do now. Could it be cam bearings - I would expect a rumble/lots of vibrations rather than on every cam rotation. Could the oil pump cause this noise? When starting, the oil pressure light goes out after a second.

Would there be any point dropping the sump and looking at big ends? Not a job I fancy if it can be avoided.

Could a broken piston ring or something cause this noise? Am sure its higher up the engine though. Perhaps a pressure test?

Could a faulty injector cause this noise by over fuelling or something? - am clutching at straws now!

Am so stumped am about to give up

thanks
 
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you would have felt wear in valve drive train with finger on rocker ,bearing in mind rebore would be 20 thou 10 thou per side wear ridge would be big,bust rings will usually leave vertical score marks down bore,poor cam brgs usually give low oil pressure,id still check rocker shaft ,valve srings etc
 
Thanks for your help on this. Should I remove the rockers from the shaft and look for serious wear on the shaft. I'll take the valves out and look for play in the guides.

thanks
 
worth a look ,i thought you had ruled out injectors by loosen nut cutting out injec tor opening,turn engine over while heads off
 
Yep, sorry. can't be injectors as you say. I'll see what happens when I turn the engine over. Thanks
 
Sorry to drag this one out...

I can't hear the noise with the head off and spinning on the starter. The rocker assembly looks very good - no play in the rockers in any direction and barely visible wear on the bar. (I'm wondering if its a recon head its so good)
I've only had time to remove a couple of valves and they are in very good condition although inlet a bit gunked up on the backs of the valves - no play in the valve guides. Would it be easy to spot a broken valve spring without taking them all out?

I'm stumped. I'm tempted to put it all back together and just run it until something goes bang but I need it for an everyday runner.

Any other ideas?

thanks
 
Jerf i might be wrong but dont turn the engine over woth the starter when the heads off.
No load on the valve tappet assy may damage them.
Talking of which have you had the tappets out for a look?


Lynall
 
Hi, the cam follwers were removed when I did the test - they all looked good. I was thinking of putting it all back together but removing a couple of pushrods to rule out a particular cylinder valve gear? Yes, the followers may bounce around on the cam but there is not much force on them and its only for a few seconds.
 
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