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<!-- google_ad_section_start -->Changing a Fiat Punto 1.2 8v Mk2 Alternator<!-- google_ad_section_end -->
Changing a Fiat Punto 1.2 8v Mk2 Alternator
Published by Ziggy122
25-10-2011
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Working on remove the current alternator


Start with making sure the handbrake is on - and popping the bonnet
With a 10mm Socket or Spanner Disconnect the battery, you donít need to remove
just Simply Disconnect the terminals and push away from the battery

Next if you are using a new alternator, it wonít need any prep work, but like me the old wires have to be removed from the scrappy cars alternator
Using a 8mm Socket I simply undid the Nut and pulled the wires off
And the larger Red Wire uses a 13mm nuts, with a socket undid and pulled the wire off

with the car now Discharging, Spray a little WD40 onto the 3 Bolt as mentioned earlier

Using the 17mm socket or spanner Start my Loosening all the Bolts that retain the alternator in place
Donít Fully remove as you donít want it to just drop off
Once loose I Removed them by hand holding the alternator to prevent it dropped
The sliding points should now allow you to remove belt tension and just slide it off
Once free - lay the Unit down - I rested it on the Steering Arm, wonít do it any harm

Undo the 2 wires from the back and Retain the nuts

Once Free From Bolts wires and Belts
Remove unit from the car

Collect your replacement unit and fit it into the same position as you did when removing the wires
Make sure you refit the wires in the correct poles and correct way - so not to strain the cables
Once cables are fitted - slide the unit up into place on the bolt holes and sliders

Loose fit the bolts - so that the sliders remain free to rock back and forth

Slip the Belt back over the top of the Pulley

Push the Alternator Away from the Engine towards the Firewall/Scuttle panel off the car
The belt will now become tight, simple Nip the 2 Bolts up nice and tight to prevent it loosening its tension
Once tight, refit the Bolt and Nut as well - making sure its tight

If the belt is tensioned okay, it shouldnít squeal
Too loose and it'll squeal like a pig

Once your alternator is secure and belt tensioned
Double check all your bolts are tight You really donít want to loose them on the motorway and for the belt to slip off and stop charging when you need it most

If your happy its secure - Reconnect the battery.

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Old 30-09-2012   #1
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Cool Alternator CAN BE REPAIRED! Don't replace it!

Quote Originally Posted by Ziggy122 View Post
And watch the voltage

With the engine off Battery voltage should be around
12.3 to 12.7
engine Running - 13.6v to 14v
1) Good battery should have at least 12,6 volts (12,5 and less requires proper charging and after that checking electrolyte density - most important parameter).
If density is not correct, you can easily recover battery by replacing electrolyte (and making desulphurization procedure if needed).
Of course, to do this, you should use classic, serviceable battery, not modern, so called "non-service" type (which main purpose is, to make you buy new one, and make you think, that most things are "impossible" to fix).
In most cases there is no need to buy new battery if it's "bad". Check also current consumption at engine switched off (much more than 30-50 mA will be cause of draining out battery).

2) Alternators (voltage regulators inside) have temperature-dependent characteristics!
Reason for that is to enforce proper charging process in winter time and avoid boiling out battery electrolyte when it's hot.
Example (sorry, it's not in english, but I think, clear enough to understand).

So, mind the temperature of alternator before you judge voltage level as "good" or "bad".

3) Wonder why you guys, almost always (on forums like that) forcing people to replace entire things like starters and alternators, while these are reparable devices!
Most problems with alternators rely on voltage regulator and/or bearings. Maybe diodes (bridge) sometimes fails.

Voltage regulator - quick and easy to replace (no special tools needed).


Bridge (you may need soldering gun to replace it - depend on alternator model).

Bearings may be Pain In The A... if you try to do this first time in your life (and don't even have basic tools like bearings puller), and you have "substitute" instead of original Bosch or Magneti-Marelli alternator (because there will be problem with purchasing correct bearings - proper clearances/fitting - like in this example, again, not in english: fiatpunto.com.pl/topic37324.html - but "a picture is worth a thousand words").

So, it can be successfully repaired (try not to do "shortcuts"/"cut corners" like that - by replace whole thing).
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Last edited by pmx007pl; 30-09-2012 at 14:43. Reason: Mistakes (english is not my native lenguage)...
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Old 30-09-2012   #2
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Re: Alternator CAN BE REPAIRED! Don't replace it!

Quote Originally Posted by pmx007pl View Post
1) Wonder why you guys, almost always (on forums like that) forcing people to replace entire things like starters and alternators, while these are reparable devices!
Most problems with alternators rely on voltage regulator and/or bearings. Maybe diodes (bridge) sometimes fails.
We used to repair starters/alternators but these days pattern starters/alternators are so cheap it doesn't make economic sense to repair. Also people want their cars fixed now and don't want to be off the road so won't wait until parts are sourced.
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