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Unread 11-22-2014, 08:06 AM   #1
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Join Date: Sep 2013
Location: London, England
Posts: 4
Kj/liberty rattle

Hi,Just a quick post to help anyone that is suffering from the rattle on the top end of a 3.7 V6 motor.I recently rebuilt one of these motors from top to bottom and could not understand why the engine should start rattling after 50 miles.As I said everything had been renewed including timing chains,tensioners,pistons,small ends,mains and big end shells and valve seats and oil pump,etc.

I assembled 90% of the engine,but left the timing chains and tensioners to a mate,who I might add,is pretty competent.After starting the engine initially it sounded fine,but soon developed this horrible rattle underneath the A/C compressor.The Serpentine belt was removed to eliminate the compressor and associated items driven by the belt,but it still remained.I quickly arrived at the conclusion that it was a faulty tensioner.

This proved to be not the case and the actual problem was a little more hard to find.What had actually happened was that when my mate assembled the timing gear he made a very simple (now obvious) mistake.What he did was to put a restrictor plate behind the R/H tensioner which,upon making various checks,does not have one (only fitted to L/H tensioner) and subsequently cuts the oil supply to the tensioner if fitted.This was removed and everthing is now fine.The Liberty/KJ workshop manual does not make this clear.

Anyhow,if anyone is having this problem I would suggest this is checked before pulling the engine down and save yourself a lot of unwanted work,especially if this noise occurs after a rebuild.

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