bottom end knock?

[steve963]

Can hear a very light rumble when under light load between 2-3K rpm

Just hopeing its something else rattling at this rpm

no different when hot or cold though?

Any ideas?

 

[olliecast]

tbh mate, thats the frequency most people hear the knock at when it first begins.
Are you due an oil change? if so you could whip off the sump and inspect the bearings just in case to avoid ruining your crank

 

[steve963]

yeah due oil change,

what would I be looking for on the bearings?

 

[jjs]

any scoring and you may see that the white metal has been scraped off and will be down to the copper, or as in my sons caes his shell had split in three, he was lucky and got away with a new set of shells

 

[olliecast]

bobby mentioned a good point of siving the oil through a pair of tights when its changed aswell to see if there are any bits of metal inside

 

[jpward]

Can hear a very light rumble when under light load between 2-3K rpm

Just hopeing its something else rattling at this rpm

no different when hot or cold though?

Any ideas?

http://www.youtube.com/watch?v=ZmcmlBxbVa0

If it sounds like this you will need new shells for sure!

:?

 

[steve963]

I guess I have to take off the bearing caps!

Can you just take them off 1 at a time withought warping the crank?

And then just refit if everything is ok?

 

[jjs]

yes thats how we did it , i take it you are just doing the big ends and not the mains,

 

[steve963]

not thought about it really,

will the mains cause knock? or is it more likley the bid ends

 

[jpward]

not thought about it really,

will the mains cause knock? or is it more likley the bid ends

You talking about ebay now or something?

More likely the Big ends ;-)

 

[steve963]

ebay, dont get you? gonna fix it, not sell if thats what you mean

so Ill have to take off the sump and the alloy oil pan I guess?

Its only got 60K miles on it, been using the best oil, never tracked it, but have been running 1.2bar for 5K miles

 

[GTIR-LOZ]

i think it was a very very poor attempt at a joke lol

 

[steve963]

just re-read it, 'bid ends' lol

I get it now....

 

[jpward]

i think it was a very very poor attempt at a joke lol

Trust me me when your big ends go you need all the jokes you can get!!

:doh:

 

[GTIR-LOZ]

you leave my big end alone!

 

[steve963]

never mind all this, tell me it must be something else and my cars fine, if not tell me its easy to fix, lol

 

[jpward]

never mind all this, tell me it must be something else and my cars fine, if not tell me its easy to fix, lol

Try removing the top mount cooler heat shield and also check the turbo and manifold ones as well as the exhaust to floor gap just below the point of the drivers seat.

All possible places for resonating at those RPM's

 

[steve963]

yeah the exhaust does catch, forgot about that, will check!

fingers crossed