I have a 156 2.4 JTD 10v. I want to change the auxiliary drive belt. Was following a guide on Alfa Workshop which says "Using a spanner on the bolt in the middle of the auxiliary belt tensioner move the tensioner anti clockwise then slip the belt of the pulley".
Can someone confirm wether this should work like a spring loaded tensioner? It has a 17mm size bolt in the middle of the pulley which just undoes when I try and turn it anti-clock wise, what am I doing wrong?
Undo the bolt holding the tensioner. Then turn the tensioner anti-clockwise. The hole in the tensioner that the bolt passes through is not central so when you spin the tensioner anti clockwise it acts like a cam. I used a pin spanner in the two small holes in the tensioner to re-tension.
Main tensioner on my 02 2.4jtd requires a 32mm spanner from below to slacken, then I hold the spanner tensioner with cable ties till I fit the belt. There is also a pulley which is eccentric higher up which needs to be loosened. 32mm spanner from Halfords was £12.
There is a procedure for setting the correct tension on the auto tensioner.
You use the fixed tensioner that my original post refers to and includes the use of a pin in the auto tensioner.
Very few people fit the auto tensioner correctly.
Found where you put the pin to set the auto tensioner, thanks.
We took the tensioner off this evening to find that the bolt in the middle of the 32mm has clearly been snapped for a number of years. No clean breaks, was very rusty and the previous belt was 5mm shorted, so this must have been holding it all together!
Managed to get the snapped bolt out of the block, luckily there was a good 3-4mm sticking out. Hammered a 9mm spanner onto it and then used a socket Came out with no fuss.