knock when cold
Discussion
As my first thoughts baz 
to light for valvetrain. Have you taken sump off yet? By far the easiest way to inspect at this stage. Not difficult to remove bid-end caps and inspect. Piston? Don't mean to worry you bloke.
to light for valvetrain. Have you taken sump off yet? By far the easiest way to inspect at this stage. Not difficult to remove bid-end caps and inspect. Piston? Don't mean to worry you bloke.Edited by macdeb on Saturday 9th May 23:35
Edited by macdeb on Sunday 10th May 09:36
My opinion, for what it's worth is that this is piston slap. It's one of the only noises that will get quieter as the engine warms up. Bearings will get noisier as the oil heats up and gets thinner. Engines with forged pistons will rattle like this especially from cold but its a more general rattle. Yours unfortunatly sounds like just one piston which may have partially seized and shrunk a little or Maybe a crack in the skirt? I take it the pistons in these engines aren't forged? My 500 will do this in cold weather for the first 30.secs or so but yours does sound way louder.
Actually scratch that. I just videoed mine from cold start and the play back sounds bloody awful. I know for a fact that mine has been like it is for the three years that I have owned it because I remember hearing the noise when I test drove the car and I made a comment about it to the seller. At the time I told myself that if I have to rebuild it then so be it. i was just pleased to be in a position to buy it ( there's not many of these cars in NZ) anyway I have covered around 30.000 Kms and it uses about 1/3 of a litre of oil per 1000 Kms concistantly. Might upload the vid. later if I get time cheers.
And again when cold
New rockers shafts lifters stripped cleaned and checked
Pre loads set
Nothing nasty by eye
Am thinking a lifter that's slow to fill on mine
Oil consumption is nothing to speak of and no smoke on start up or running temp
And the plenom stays clean so it's not breathing heavy
New rockers shafts lifters stripped cleaned and checked
Pre loads set
Nothing nasty by eye
Am thinking a lifter that's slow to fill on mine
Oil consumption is nothing to speak of and no smoke on start up or running temp
And the plenom stays clean so it's not breathing heavy
Thanks for the replies. The knock is diffinately from the top of the engine. So will take the rocker covers off, check for any slack in the rockers. Thinking a lazey lifter, bent valve or lost a lobe on the new cam. However having taken off the oil filler cap, there is a deffinate pulsing of air. So could be worn rings on a piston. Not done anything to look at it yet as been busy at work, so will have a look in the evenings this week.
Trouble is I am not totaly mechanicaly/technicaly savvy and don't want make the motor undrivable to take it to a mechanic.
The joys of the MCC I suppose.
Thanks
Barrie
Trouble is I am not totaly mechanicaly/technicaly savvy and don't want make the motor undrivable to take it to a mechanic.
The joys of the MCC I suppose.
Thanks
Barrie
if oil pressure is ok hot , at tickover , then id say a piston has nipped up ,does sound a bit big or little end ish mostly big end .it could be a lifter , but they don't normally get louder due to rate of cylinder pressure going up , and that noise certainly seems to increase the harder you accelerate the engine.
Baz maybe its my s
tty laptop speakers but I cant really get a feel with that vid 
if you want to identify/mask a noisy cylinder stop each cylinder firing by unplugging one inj at a time, I would say unplug an HT lead but if you cause too bigger gap for the unplugged lead to jump you may damage a spark driver (I dont want that responsibility even if unlikely) it maybe nothing more than whats been suggested already rocker gear related 
tty laptop speakers but I cant really get a feel with that vid if you want to identify/mask a noisy cylinder stop each cylinder firing by unplugging one inj at a time, I would say unplug an HT lead but if you cause too bigger gap for the unplugged lead to jump you may damage a spark driver (I dont want that responsibility even if unlikely) it maybe nothing more than whats been suggested already rocker gear related Gassing Station | Chimaera | Top of Page | What's New | My Stuff