Alternator diode faulty - Repair or replace alternator? TD27

[Damz]

So after a couple of flat batteries I thought I better find whats draining the battery.

Multimeter claims around 1.4A being drained with everything off and key out. Typical is around 30mA!

So found this site

http://www.tpub.com/content/recoveryveh ... 4P_213.htm

...And after the first few tests it looks like I have a faulty diode. I removed charge lead connector (hope thats the very bottom wire and not the plastic plug) and the light went out.

So whats the option from here?? Please not a new alternator....

Cheers


EDIT: I tried pulling fuses 1st, even with all of them out it still reads 1.4A being drained

[Landy Rover]

Take off the Batt wire from alt then check for current draw( Amp meter in series with main batt cable) if zero, replace retifier in alt, not too hard to do. Need good heavy soldering iron.

[sibainmud]

My advise would be throw it away. Every time I have had an alt that shorts a diode, the extra work seams to take the regulator out as well
That's why I have a remanufactured alt ready to go in case, and I even take it on long trips too. I got it cheap of trade me from a guy that bought it by mistake, his loss, my gain
$80 was cheap, I thought.

replace rectifier in alt, not too hard to do. Need good heavy soldering iron.

That is easy to us that have done that sort of thing before, but might be a bit over the top for a novice.

I will be interested to know the end result too.
Cheers,
Simon.

[Landy Rover]

True, but all of us are novices the first time we attempt something, question is does an individual have a go or always wonder "could I have done that?" If he dicides to throw it away, he should pull it apart just for the experience. Digital cameras are a great tool for the beginners to remenber how it looked in various stages. No doubt it wont be the last altenator that he has to replace or repair

[Damz]

Excellent will do that tomorrow cheers.

Happy to have a crack at fixing it if its going to work out cheaper..

While on the topic of my alternator, theres a small oil leakcoming from around the back of the vacuum pump somewhere, cant find exactly where. Any common places this happens on these trucks?

[sibainmud]

The swage on the pressure hose weep sometimes, but if it is coming from behind then it could be the seal and/or O rings on the wear plate, which may indicate the bearing is near shagged.
I still stand by my first advise, but have a go, you have nothing to lose.
It is hard for a Tradesman to think like a DIYer sometimes, as I sell my time for a living, I have to contend with the Consumers Guarantee Act and carry the warranty too, so I can't afford to go back to have another go at fixing things. Every repair I make to anything has to be permanent and at a reasonable cost
Cheers,

[Damz]

The swage on the pressure hose weep sometimes, but if it is coming from behind then it could be the seal and/or O rings on the wear plate, which may indicate the bearing is near shagged.
,

Which bearing could be near shagged? The one the alternator shaft spins on?

And which pressure hose to check mate??

[flyingbrick]

if you need a quick cheap fix just try buy one from a vehicle thats being wrecked. Theres bound to be something cheap and local to you somewhere.

The last thing you want is to pull the alt out, stuff it, and then have nothing ready to go back in.

-Nathan

[sibainmud]

There are 2 hoses that supply oil and drain it away, kinda like a turbo. The one that comes from the block oil gallery is the pressure and the other slightly larger is the drain. Pressure one sometimes leaks at the collar that acts as a hose clip (swage).
These vacuum pumps go for yonks with no issues until they get a little lateral movement, which takes out the seal on the shaft.
So, it may be the rear bearing near shot or the extra heat from the alt "over-working" has toasted the O rings and/or the seals that seal the whole pump body to the plate that holds it all together. When I am faced with multiple "faults", the call is to "out-work" it or replace with a complete new/second hand/remanufactured unit, then when it turns pear-shaped it is someone else's problem
Cheers,

Edit; Good call Brick

[Damz]

Sweet, cheers Simon. Lamans terms are great

Theres a couple on trademe, might get one of those and then look at repairing this one later, seeing as it looks to be multiple faults anyways.

Aint nothing like having a spare

[Pinelli]

Sorry to drag up an oldish post, I've got a TD27T with a grotty, oily vacuum pump, obviously leaking, and I would like to sort it out while its out of the car.
Is there a gasket between the pump and alternator as well, or just the o-ring?
If the bearing is shot, will I be able to replace it at home, or will it need a press to refit the new one?

Cheers

[slide]

An oil seal and an o-ring are between pump and alternator. Worth checking the feed and drain pipes too, as often it will be them leaking. Bearing is easy to fit, but much harder to remove without a (very) small puller. If you can get bearing off then you'll have no trouble replacing it