Engine noise

[twinturbo]

in 1999 I bought a clean looking 1.8 LX at auction for £250, it idled wonderfully quiet. but when I hit 2.5K i Got a rattle..

I went through everything short of the camshaft ( bought it but never fitted it as I stole my bro's engine )..

The most likely culprit is a failed follower, they were available from motor factors back then for about £16. Make sure they know it's a 1.8 CVH as 1.6 ones that cost £4 are no good.

It's an easy job, may be worth pulling them right after running and then checking the lenght with a micrometer to see if one is flaccid.

TT

[snapper]

Sometimes an exhaust gas leak from manifold to head can sound very much like valve tapper noise

[HandyAndy]

Originally Posted by snapper

Sometimes an exhaust gas leak from manifold to head can sound very much like valve tapper noise

Hmmm, now thats got me thinking, maybe as i,ve just welded up a home made exhaust down pipe etc etc , thanks Snapper I,ll check that tomoorow too

on the plus side of things, it sounds lurrrrrvly with the silencer in place

cheers
andy

[drury318]

Hi Andy, might be stating the obvious here but if the tickover is too high then just turn the idle screw down a bit?... and as Vern says the rattle will be just a hydraulic tappet or two, renew the set and you will almost certainly cure it, and use 10/30 oil. Dennis.

[HandyAndy]

Thanks Dennis & Adrian, great info here

yes I have blocked off the breather that goes from the "frying pan " to the inlet manifold, I,ll check all the diaphragms tomorrow & with a bit of luck, thru a process of elimination of the all the points raised I,ll find the culprit,

I,d really like my new tyres so hopefully this won,t break my squeeky budget

thanks guys

cheers
andy

[spud69]

Hi Andy,

You got your prop shaft yet?

Also got some spare hydraulic lifters if you need to try and replace any.

Regards....AndyH

[mark]

Mine did the same a few weeks back just after i got it on the road, it was almost a knock rather than a tap, i was using 20/40 oil

I put some engine flush in got it very hot drained it, new oil and filter with 10/40 semi synthetic and it purrs perfectly now

i played with cvhs alot a few years back when i 1st passed my test and they do seem to do this when they have been stood a long time, sometimes some flush and fresh oil and a run out sorts it, sometimes it dont. Some people say if its goona be stood a while to take the tappets out and store them in a bath of oil.

If you do need to change the tappets and want to do the stem seals whilst its in bits i have a tool to do the seals without taking the head off, giz a shout and you can borrow it if you like, i may even give you a hand!

[twinturbo]

The hot bath of oil trick can help revive a tappet. They can quite often get blocked by solidifed crud.

TT

[HandyAndy]

A little update........

I,ve spent the morning working on the car,

Solved the high tickover .......... I had not tightened a bolt that I,ve put into the manifold that originally had a pipe connected to the "frying Pan air filter" or the one going to the Brake servo ( which is no longer there ), so was losing manifold pressure, sorted

Re jigged my throttle cable ( Thanks Spud ), all smooth & free running

I took the rocker cover off whilst the engine was stone cold, I noticed that a couple of the rocker arms were a little on what I thought were loose, checked the bolts, all tight, didn,t go any further,
Ran the engine up to temp, the tapping noise is still there, it seems to come & go to be honest,
I,ll be changing the oil & filter tomorrow so will see if that helps

cheers Spud & Mark...........might be a case I need you both to come & have a look & listen, see what you think ........please

cheers
andy

[antonia800]

its all to do with the oil you must use a mineral oil in the cvh 10/40 dont be tempted by performance oil, duckhams do a good one (from my time racing a XR2) came of track ratteling like a bag of spanners changed the oil quiet as a mouse brilliant