Ticking and its doing my head in

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smurphy

Active Member
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The Potteries (Land of the Gods)
My 95 Disco 3.9 V8i is ticking, its coming from the left bank closest to the bulk head. It only tick's during acceleration, once up to speed it quieten's down or doesn't do it.
I know a lot of people will say slipped liner, but it does it when hot or cold. Also there isn't any coolant loss, or overheating and excess pressure in the system.
I presume its one of the rockers or push rods, it is due a oil and filter change. What i want to know is what would be best to change i.e. all of the valve system cam, push rods, rockers, cogs and timing chain. Or is it O.K. just for the rockers to be changed?
 
best practice to do them all.

also wud be a fooker to have it all back together and find you did the wrong tappet :p

u sure its not a small manifold leak?
 
fett said:
u sure its not a small manifold leak?
Click to expand...

I did think of that so I've felt around the manifold as close I can get and there's no air leaks that i can feel, also it sound as if its coming from the rocker cover.
Is it possaible to change the springs on the valves without taking the heads off? I done head-gaskets and other things before but nothing as in-depth as this. If I'm going to replace the Cam-shaft I may as well replace it with a fast road one.
Also how long should I allow to do the job, I did the head-gaskets in just over a day, and gearbox change in two.
 
you dont need to take the springs out , just new cam an followers. you might find just followers.

it could just be one rocker arm or push rod too.

is it auto?
 
Is it like a loud machine gun when u accelerate and then dissapears when you ease off.
Can u hear it when the engine is under load ie. going up a hill but not on tick over.

If so, O dear............

Mine was like that for eight months untill I put the disco in for service and told them to sort it. It was the (Y) pipe to manifold gasket that was blowing and as they had to drop the pipe to replace the auto box filter they was no extra charge as the gasket price is in with the additional cost for the fluid & and filter change.

A worn cam will tick all the time my old RR had to have a replacement at 90.000mls
 
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The good news is that it's unlikely to be a liner because although your comments re. temperture/coolant are no guarantee in themselves that the liners are ok, the sound would be that of a metallic tap (not a tick) & would be at piston speed, whereas valve gear noises are half of that. Sorry I can't be of further help.
 
rocker arm most coman, or a sticking followers always replace followers as sets!
replacing individual followers is a waste of time if overe 70k suspect cam worn out too
 
vougese39 said:
rocker arm most coman, or a sticking followers always replace followers as sets!
replacing individual followers is a waste of time if overe 70k suspect cam worn out too
Click to expand...

Its defiantly coming from beneath the rocker cover, and its probably over due a cam its done 130,000.
I'll run it until I get all the parts together, then spend a couple of days doing it!
Does anybody have a list of parts I'm going to require because I'm going to do from the cam up
 
rpi engineering do a full cam set - tappets, chain gaskets etc etc

it's on ebay aswell.

they sell pushrods, rockers etc too (and say their cheap too)

worth a look to get the idea...
 
Hi there
I have a brand new Cyclone performance camshaft (from Real steel) if you are intrested, i had to replace the camshaft in my disco it was the reason i got it cheap, i put a performance piper one in and 30k after it started the noise again, so i ordered a kit just in case, once stripped i found it to be a bad cam follower, so i used the everthing else and i am just left with the cam, i now have a p38 and it wont fit that, but i need one for that now :doh:

Ian
 
be very carefull of cheap timing kits followers and rocker arms are cheap which means no good i only fit piper cams and geniune dealer parts for the valve train got caught out quite a few years ago then a customer of had fitted a new gen cam from a supplier with new followers all the followers had failed when he asked for a replacment under warranty they said it was his fault.

when running a cam in the pipers have to be reved to 2,500 rpm for the first 20 min when first starting scarey!
 
Hi thanks for all your info guys, would this one be any good.
What I may do is buy another 3.9 and do a full rebuild depending what money's like in the new year. that way my car would be off the road for only a couple of days. If not how long do you think it would take to do the camshaft also Im going to buy new rockers and push rods.
Also Ian PM me with a price are they any good?
 
interested to hear what stu says, but i was looking at them and would definitely spend the extra 30 on the upgrade timing gears and chain (they do a 375 pound option)

im guessing rpi only sell the good stuff, but will wait for the experts :D
 
I've got the same problem but on a 4.0l Disco II. I suspect a worn lifter as the engine was rebuilt due to a slipped liner 40K back.

Can you just replace the lifters on one bank or should I do the rockers and shafts as well? As the LPG has to come off should I do the other bank at the same time?
 
MattMatt said:
I've got the same problem but on a 4.0l Disco II. I suspect a worn lifter as the engine was rebuilt due to a slipped liner 40K back.

Can you just replace the lifters on one bank or should I do the rockers and shafts as well? As the LPG has to come off should I do the other bank at the same time?
Click to expand...
Think mine might be more than that now!! Its making sound like a prrufftt pprufft as if air is being pushed out of somewhere. i first thought manifolds or exhausts, but had it checked and its not that.
The only thing I can think is head-gasket or block around that as its got louder. I can't seem to get close enough to feel any air been passed, so my next plan is to do a compression test, or maybe squirt loads of soapy water around whilst still cold to see if there's anywhere bubbles hey, well we'll see after xmas.
I'll keep you posted regards Steve and merry crimbo n happy new year

Oh and Mat if your replacing lifters you may as-well do them all also the I'd suggest the cam and push rods, timing chain and gears too. As one would wear the other more quickly.
 
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Well it turned out to be head-gasket, blowing out of the side. No coolant loss, no over-heating.
It has me a bit miffed how this has happened but hey-ho its a job that's got be done. I don't think I'll bother having it skimmed, I'll just do the one for now. I'm defo going down the replacement engine route so I'll do a proper job on the engine after I got a new one in.
 
I think when I did the head-gasket, I got it from a local company who deal Britparts parts.
Maybe this could be why its blowing out of the side, its been on there for about 16mths now. I'm still driving it as I dont have another car, I know it needs to be left in but what can you do.
Anyway back to my question, what would be a better head-gasket make?
thanks regards Steve
 
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