AboutJohn Robison Expertise I own J E Robison Service in Springfield, MA. We are Bosch Car Service for Land Rover, BMW, Mercedes, and other European lines. I can answer most questions about Land Rover service or repair. I'm known as a car enthusiast, machine aficianado, photographer, writer, and speaker. I've been around Land Rovers and British cars most of my life. Visit me at my car business, www.robisonservice.com or my author website, www.johnrobison.com. Check out my autism and writing blog at jerobison.blogspot.com or my photos on www.pbase.com/robisonphoto
John Elder Robison
Experience I have been a Land Rover service manager since Land Rover returned to North America in 1987. My company is a four-star Bosch Car Service facility, known nationwide for Land Rover service, overhaul, customization, and restoration. We're a dealer and service agent for APCO, backer of the Land Rover Assured and Certified dealer service contracts and Easycare independent service contracts.
In addition to Land Rover our company services BMW, Jaguar, Mercedes-Benz, Rolls_Royce, and Bentley motorcars. We have factory-plus-level service capability for all makes.
Visit my company online at www.robisonservice.com > service > land rover Also visit my blog at robisonservice.blogspot.com
Organizations ASA IATN NPPA PPA
Publications In the Land Rover world, my writing can be found in Land Rover Lifestyle, Land Rover Monthly, The Rover News, The Rover Log, The Rover Reference. In the wider publishing world, my work is published by 20 publishers in over 50 countries. Look Me in the Eye is a New York Times bestseller and an international bestseller.
Education/Credentials I am ASE certified, Bosch Trained, and trained by Omnitec/T4 and Autologic on their Land Rover test systems.
Question John i have a knocking sound coming from cylinder 7 .i found that by disconnecting the plug the noise stops.i pulled the sump off and visually inspected the big end bearing and it looks ok.i have plastigauge what is the max clearance allowed?
what else can it be?Can i replace only one bearing if needed.by the way it is not a loose liner as i had them all replaced by tophat liners a couple of years ago.
Answer The knock is more likely to be a loose piston. The rod clearance has to be low, 1-2 thousandths but that is never the problem unless the berings is actually melted.
The skirts collapse by 5-10 thousandths and then the pistons rattle. I have seen that several times before
