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Originally Posted by Nic-cleanthi
Yes we fitted the all metal Tazu with the copper pipe... Where does the diesel come from? Looks like I may need to revisit this soon....
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Diesel Knock is the noise that all diesel engines make due to the very powerful compression on these engines. It is usually suppressed (as on the 75) by good sound absorbent engine mounts and soundproofing. The original clutch set up on 75 diesels used plastic components (slave, pipework and master ) that do not transmit much diesel engine noise into the cabin. However, fitting the Tazu all-metal components (slave or master, particularly with metal or copper pipework) allows some diesel noise to be transmitted into the cabin, usually as a knocking noise when the clutch pedal is pressed down. It is more annoying/irritating rather than a real problem, but if you want to avoid it, only fit original spec clutch hydraulic parts, such as genuine Rover master cylinders and slaves made by LUK or AP/Delphi (although these now come with metal pipework in place of the original plastic pipes, unfortunately).
Pete