blue beasty

blue beasty

Leaks an prone to bits dropping off
I'm thinking the worst :(

Doesn't do it when starting up, ticking over or if revs are slowly increased but as soon as the engine is put under load a noise that sounds very metallic to me come from the rear top as far as I can tell.

Tappets are all set and everything looks normal under the cover.

Just changed the manifold gasket after a suggestion it may be that and it was split on no4 exhaust but a new gasket hasn't made any difference... I was dubious anyway.

It has just had a head gasket change (nasty BP copper job) but no obvious sign of it being gone and has been running fine.

Noise appeared under light load on a short journey, hasn't been worked hard or overheated and the noise gets worse as the engine warms up.

Thoughts?

 
Have you had the air filter off whilst driving.

If so have a look in front of the butterfly. Sounds like a woodpecker has been sucked in.

:eek:
 
Bobsticle said:
Hope its not as bad as it sounds. Could it be a little end? :(
Click to expand...

That's my main suspicion, not sure why though.

It appeared out of nowhere, i know blowing the head gasket isn't great but wasn't driven as soon as symptoms appeared and there was no real oil contamination. Oil was flushed and replaced with a new filter anyway.

It'll have to wait until I have time to strip and investigate which isn't going to be for a while :(
 
It sounds from the vid clip almost like an induction related noise. It doesn't appear steadily progressive with load like a mechanical issue. I wonder if it could be electrical related?
 
Could sound a little mad but could the rocker shaft be broken? The reason why I say this is due to a similar issue I had a few years ago with a ford ohv engine
 
Mulcaster1 said:
Could sound a little mad but could the rocker shaft be broken? The reason why I say this is due to a similar issue I had a few years ago with a ford ohv engine
Click to expand...

It's possible but no obvious sign. Rough plan is to strip off rocker shaft, remove head and then drop the sump unless the problem becomes apparent on the way.
 
It's interesting how the noise depends on the engine load. It might be possible to isolate the cylinder responsibe by repeating the engine rev test with each plug lead removed in turn. A compression test [snap! you said this while I was typing!] before you begin dismantling might also be helpful.

As well as the obvious bearing failures which you're considering, there are more unusual possibilities - detachment of the piston crown, for example. So, if you've got the head off, and the sump off, but can't see a problem, it can still be worth taking the pistons and rods out.
 
A relative of mine back in the late 70's had this on a new to him rover SD1 V8 he was a trained rover mechanic and after doing the obvious check's he stripped the engine down rebuilt it and still had the same problem, anyway by chance my dad went round just for a visit ( self trained mechanic ) and worked out the Rotor arm was duff and replaced it with a new one and problem was solved, mite be worth a check :)
 
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cornish rattler said:
A relative of mine back in the late 70's had this on a new to him rover SD1 V8 he was a trained rover mechanic and after doing the obvious check's he stripped the engine down rebuilt it and still had the same problem, anyway by chance my dad went round just for a visit ( self trained mechanic ) and worked out the Rotor arm was duff and replaced it with a new one and problem was solved, mite be worth a check :)
Click to expand...

She was missing a little on tick over, I don't think it's related to the noise but I went through the plugs leads etc. and she's running smooth. Cap and arm look fine.

Kinda out of ideas other than compression test and pulling her to bits
 
blue beasty said:
She was missing a little on tick over, I don't think it's related to the noise but I went through the plugs leads etc. and she's running smooth. Cap and arm look fine.

Kinda out of ideas other than compression test and pulling her to bits
Click to expand...
there isn't a push rod that is plugged up and not getting oil to a rocker arm is there?
 
Thor1950 said:
there isn't a push rod that is plugged up and not getting oil to a rocker arm is there?
Click to expand...

All looks well lubed with fresh oil. Rocker shaft is retained by headbolts but I took it off and replaced complete when I did the head gasket.

I'll strip it when I get to it this time but I'd expect anything like that to be more continuous and worse on start up rather than only under load.
 
I had the same symptoms on a Datsun a series engine ,after a head gasket replacement similar noise ,I replaced the head gasket, retourqed and set clearances and never found any problems ,the noise was gone after the second go at it ,weird
 
It's odd it's only under load, could it be detonation, has the timing slipped somehow
 
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