well i've done oil change on the classic today its done 100 miles after full rebuild and noticed when on tick over if you touch the throttle very lightly theres about two very faint taps/knocks from engine then goes. i didnt notice it before oil change and filled the filter fully first (took a good twenty mins ) un plugged both crank and cam sensors and cranked engine to get good oil pressure ( 6 bar ) before plugging sensors back in and starting. read a few things on internet about could be it detting? and others say theres have made noise similar for years. whats peoples thoughts? is it normal or should i be pulling engine apart again? thanks.

 

you'd need to give details on the actual engine and its rebuild

 

its a r plate uk2000 and just a standard rebuild with acl bearings. my mate been round ( 15 years vauxhall technician ) and said he wouldn't be worried about it.

 

A worn cambelt tensioner will give you the same sort of knock as will a loose front pulley bolt - hopefully your problem isnt a serious one.

Mick

 

bit of update had few mechanics cast their eye / ear over the engine and all said "i wouldn't be worried" but tonight ive just filtered the old oil to inspect and found tiny bits of filing in it :-( the noise hasn't got worse, should i leave it and see if it gets worse? thanks

 

was the sump flushed properly in the first place? you could juts be seeing bits from the last failure.

 

i would have thought after a full rebuild and first oil change you might see some small evidence of filings? or is this the second oil change?

 

this is first oil change.

 

well after a good inspection tonight a hydraulic tapit seems to have been the culprit, all sorted now and panic over. thanks

 

had a similar issue with mine. sounded like big end. took it for a good raggin and it cleared. never never been a problem since (3 years later). bucket stuck.