Right First off this is an involving task requiring some specialist tools and a bit of care and attention to detail get it wrong and there is a risk of serious damage to your engine....
Tools/ equipment needed
basic tools:
selection of socket sets i used a mixture of my 1/4" 3/8" 1/2" sets
Breaker bar
Large and small torque wrenches
Slotted and pozi screwdrivers
T25 torx driver
2x trolley jacks
1x axle stand
Cam belt kit
Replacement Aux belt
Crow bar
Mallet
Marker pen
liquid gasket compound (for rocker box top gasket)
8 10 15 24 mm Combination spanners
1/2" drive T55 Male Torx socket
E14 E18 Female Torx sockets (for engine mount)
Cam locking and timing kit (ensure you get the correct one for your engine look at your VIN plate in the boot and match the engine type code to the kit.
)
Fiat ECU / MULTI ECU scan + leads / a garage with the relevent software and leads to carry out a Phonic wheel relearn
so park the car somewhere safe and level chock the wheels and leave out of gear...
Disconnect battery (check you still have radio code if after market HU fitted)
remove the Air box as described here:
https://www.fiatforum.com/grande-punto-guides/234763-spark-plug-change-1-2-8v.html
Next remove the Coil pack (3x 10mm bolts) and carefully tuck out of the way
now carefully remove the 2 plugs from the engine management computer (the red levers lift up and eject the plug do not force them) Mark them left and right with the marker pen so you know which goes in which hole when you come to refit
then undo the 4x 10mm nuts and put computer in a safe place where you wont kick it or stand on it
next remove the computer mount (1 nut and 3 bolts)
Remove the engine earth link and the Lambada sensor plug and cable support bracket.
Remove the Cam position sensor (and solonoid plug / wiring (vvt only))
Now remove the upper cam protection cover (3x 10mm headed bolts)
remove with care freeing the cable that is held in the channel in the cover
now loosen the engine support bolts (do not remove just loosen) using the E torx sockets..
and slacken 3x alternator bolts pull alternator towards front of the car and remove Axillary belt
and remove Rocker box top (8x 8mm headed bolts) and gasket
Remove the drivers side front wheel and arch liners (obviously jack and axle stands)
Now remove Alternator drive pulley (3x15mm headed bolts)
and remove lower cam belt cover (1x 10mm headed bolt)
exposing crank pully (note the dimple thats the timing reference mark for the locking tool)
now place a block of wood under sump and remove the entire engine mount..
the cam belt and tensioner should now be fully visible..
Now before you go any further ensure the engine is "in time"
with a spanner on the crank pully rotate the engine till the cam locking tool fits in the slot on the crankshaft end
(watch you don't damage the rocker top seal)
now there is 2 turns of the crank which gives one turn of the cam it is possible that at first your cam will be 180 degrees out of time with the cam when trying to fit the cam locking plate..
this is 180 degrees out:
if that is the case rotate the crank until both locking tools line up hold the crank one in place initially so you can see if its in line or not..
Then fit lower locking tool ensuring its the correct way round and that the dimple on the crank goes into the hole in the tool and secure in place with the bolts in the kit
now with a 13mm spanner loosen the cam tensioner and remove it and the belt..
THOSE WITH VVT READ PAGE 2 NOW!!!!....
SEE PAGE 3 for water pump replacement at this point
put on new cam tensioner and do up nut finger tight
next slacken off Cam pully
FIRST REMOVE CAM LOCKING TOOL or you can damage your camshaft end
loosen using a 24mm spanner on the flats on the cam shaft and a T55 torx socket
(i took this pic as i was refitting a torque wrench shouldn't be used for removal)
Refit locking tool
now rotate the cam pully fully clockwise till it hits the stop
Now wash your hands and degrease the rollers and tensioners using brake cleaner or flash degreaser
take out your new belt and starting at the cam pulley go round clockwise
Cam - waterpump - crank - tensioner
Get the 2 pin tensioner tool from cam belt tool kit and turn it gently anticlockwise till it hits the stop (ie max tension) then hold and torque bolt to 28 NM and Remove locking tools
place spanner on cam again and this time tighten the Cam torx bolt to 70NM
rotate the engine twice by hand (spanner on crank pulley) this beds in the belt
now loosen off the 13 mm tensioner nut carefully at the same time hold the tensioner with the pin spanner so as not to let fully loose tension and align the tension indicator as below:
tensioner fork highlighted:
this is too slack:
again highlighted (the back fork is to the left of the front fork)
rotate engine again by hand several turns then check indicator is sill showing correct tension and refit timing tools to check timing is spot on and its not jumped a tooth or anything like that
ensure all tools have been removed
REFIT LOWER CAM GUARD NOW or you wont get it back on
next refit lower alternator pulley (ensure dimple lines up with hole in pulley)
at this point its easier to refit and tension the alternator belt as the engine mount isn't on to tension fit new belt then pry back the alternator using a pry bar then do up 3 bolt on alternator the belt should just be able to be rotated about 90 degrees with your fingers...
Now put it all back together
rocker box gasket should be refitted like this
https://www.fiatforum.com/punto-gui...ket-without-having-leak-again-week-later.html
next run a Phonic wheel learn on MES / FES to allow the car to learn the slight change in Cam / Crank position due to the new unstretched belt
and enjoy another 4-5 years motoring...
Tools/ equipment needed
basic tools:
selection of socket sets i used a mixture of my 1/4" 3/8" 1/2" sets
Breaker bar
Large and small torque wrenches
Slotted and pozi screwdrivers
T25 torx driver
2x trolley jacks
1x axle stand
Cam belt kit
Replacement Aux belt
Crow bar
Mallet
Marker pen
liquid gasket compound (for rocker box top gasket)
8 10 15 24 mm Combination spanners
1/2" drive T55 Male Torx socket
E14 E18 Female Torx sockets (for engine mount)
Cam locking and timing kit (ensure you get the correct one for your engine look at your VIN plate in the boot and match the engine type code to the kit.
)
Fiat ECU / MULTI ECU scan + leads / a garage with the relevent software and leads to carry out a Phonic wheel relearn
so park the car somewhere safe and level chock the wheels and leave out of gear...
Disconnect battery (check you still have radio code if after market HU fitted)
remove the Air box as described here:
https://www.fiatforum.com/grande-punto-guides/234763-spark-plug-change-1-2-8v.html
Next remove the Coil pack (3x 10mm bolts) and carefully tuck out of the way
now carefully remove the 2 plugs from the engine management computer (the red levers lift up and eject the plug do not force them) Mark them left and right with the marker pen so you know which goes in which hole when you come to refit
then undo the 4x 10mm nuts and put computer in a safe place where you wont kick it or stand on it
next remove the computer mount (1 nut and 3 bolts)
Remove the engine earth link and the Lambada sensor plug and cable support bracket.
Remove the Cam position sensor (and solonoid plug / wiring (vvt only))
Now remove the upper cam protection cover (3x 10mm headed bolts)
remove with care freeing the cable that is held in the channel in the cover
now loosen the engine support bolts (do not remove just loosen) using the E torx sockets..
and slacken 3x alternator bolts pull alternator towards front of the car and remove Axillary belt
and remove Rocker box top (8x 8mm headed bolts) and gasket
Remove the drivers side front wheel and arch liners (obviously jack and axle stands)
Now remove Alternator drive pulley (3x15mm headed bolts)
and remove lower cam belt cover (1x 10mm headed bolt)
exposing crank pully (note the dimple thats the timing reference mark for the locking tool)
now place a block of wood under sump and remove the entire engine mount..
the cam belt and tensioner should now be fully visible..
Now before you go any further ensure the engine is "in time"
with a spanner on the crank pully rotate the engine till the cam locking tool fits in the slot on the crankshaft end
(watch you don't damage the rocker top seal)
now there is 2 turns of the crank which gives one turn of the cam it is possible that at first your cam will be 180 degrees out of time with the cam when trying to fit the cam locking plate..
this is 180 degrees out:
if that is the case rotate the crank until both locking tools line up hold the crank one in place initially so you can see if its in line or not..
Then fit lower locking tool ensuring its the correct way round and that the dimple on the crank goes into the hole in the tool and secure in place with the bolts in the kit
now with a 13mm spanner loosen the cam tensioner and remove it and the belt..
THOSE WITH VVT READ PAGE 2 NOW!!!!....
SEE PAGE 3 for water pump replacement at this point
put on new cam tensioner and do up nut finger tight
next slacken off Cam pully
FIRST REMOVE CAM LOCKING TOOL or you can damage your camshaft end
loosen using a 24mm spanner on the flats on the cam shaft and a T55 torx socket
(i took this pic as i was refitting a torque wrench shouldn't be used for removal)
Refit locking tool
now rotate the cam pully fully clockwise till it hits the stop
Now wash your hands and degrease the rollers and tensioners using brake cleaner or flash degreaser
take out your new belt and starting at the cam pulley go round clockwise
Cam - waterpump - crank - tensioner
Get the 2 pin tensioner tool from cam belt tool kit and turn it gently anticlockwise till it hits the stop (ie max tension) then hold and torque bolt to 28 NM and Remove locking tools
place spanner on cam again and this time tighten the Cam torx bolt to 70NM
rotate the engine twice by hand (spanner on crank pulley) this beds in the belt
now loosen off the 13 mm tensioner nut carefully at the same time hold the tensioner with the pin spanner so as not to let fully loose tension and align the tension indicator as below:
tensioner fork highlighted:
this is too slack:
again highlighted (the back fork is to the left of the front fork)
rotate engine again by hand several turns then check indicator is sill showing correct tension and refit timing tools to check timing is spot on and its not jumped a tooth or anything like that
ensure all tools have been removed
REFIT LOWER CAM GUARD NOW or you wont get it back on
next refit lower alternator pulley (ensure dimple lines up with hole in pulley)
at this point its easier to refit and tension the alternator belt as the engine mount isn't on to tension fit new belt then pry back the alternator using a pry bar then do up 3 bolt on alternator the belt should just be able to be rotated about 90 degrees with your fingers...
Now put it all back together
rocker box gasket should be refitted like this
https://www.fiatforum.com/punto-gui...ket-without-having-leak-again-week-later.html
next run a Phonic wheel learn on MES / FES to allow the car to learn the slight change in Cam / Crank position due to the new unstretched belt
the FIRE has a crankshaft and a camshaft sensor, which tell it exactly where the two ends are accurately enough to detect the subtle timing differences when a misfire occurs.
Hence the false reporting of "P0300 Generic misfire" when the cambelt has been replaced and the ECU hasn't been told- even when aligning the new belt perfectly, the two signals are no longer synchronised at the exact millisecond they were before.
and enjoy another 4-5 years motoring...
