I've recently bought a 1993 1400 K 16v Supersport as my first Caterham with 26.000 miles. Thoroughly loving the Caterham experience especially the exhaust note and acceleration (particularly when you're above 6,000 revs !!) Having been used mainly as track day car for around 10+ years and doing around 6,000 miles in that time, there were a few things to do to get it through it's MOT, although these were fairly easy and it flew through after only a few weeks work. One thing I've noticed having now done around 800 miles myself in the last month or so, is the a whine from the rear (diff I think) on deceleration and a clonk coming from the rear when going from deccelaration to acceleration. The car is fitted with an APST limited slip diff (fitted by Road and Race in 2000). Don't know if the diff oil has been changed, but given the mileage would guess not. I've been underneath and checked the A frame and suspension fixings and these all seem to be sound (no movements and torques seem OK), so guess it must be linked to the rear diff. No obvious oil leaks, albeit the diff itself is a bit grimey - dif seems to be working OK (both wheels run together when both off the floor), Questions:- 1. Am I on the right track, or could it be the suspension bushes (currently ruled out as no movement in suspension supports and the car seems to handle fine) 2. I hear whining diffs are not uncommon especially on LSD's - but what about the clonk 3. Would changing the diff oil improve matters - if so any recommendations as to grade of oil - also if so where's the drain plug (all seems a bit tight around the back, and I can't even find the nut for checking the oil level). 4. Finally - and probably the case !! - Am I just a newby previously used to driving in more cosseted (quiet) environments and there's nothing to worry about - just one of the joys of Caterham ownership. Any thoughts welcomed
