Alternator vac pump oil direction

[baba2000]

Hi, I bought a new alternator and noticed a grinding noise. after testing for oil feed I noticed the oil is coming down the thin pipe and out through the bottom of the vac pump where the fatter pipe would join. There was no oil coming from the fatter pipe, the hose is clear but plenty of oil coming from the thin hose is this direction the correct way. I thought the fatter pipe was the feed and the thinner pipe from the back of the vac pump to engine block was the outlet. Thanks.

[dumper]

The thin pipe is the pressure pipe thick pipe the drain the Same as turbos you may have a restriction when the pipe is connected but ok when off the pump

[baba2000]

Thanks, so I fitted a new alternator today and it makes the same noise coming from the vac pump a metal grinding sound, something isn't right. Tested for oil coming into and out of vac pump all ok. I agree something is restricted. Don't know what to try next.

[baba2000]

These new alternators need a banjo fitting for the feed, the older type was a screw on type. I needed to go to a hydraulic firm to have a pipe with banjo made uo but it still feeds oil.

[baba2000]

I noticed with the servo to alternator hose off the alternator was sucking in where the hose would go on is this correct. Thanks.

[dumper]

With never having a problem with the vac pump when fitting a new alternator you used to use the old vac pump so never run one without the pipes fitted.
You could have a bad alternator or vac pump maybe I’d remove the vac pump off the alternator and with the oil pipes still connected start the van and see if the alternator is ok as the oil feed is only for the vac pump.

[baba2000]

Yes I have fitted two new alternators and they work fine but have grating noise from the vac pump. I think like was mentioned earlier that there is a restriction so I have another alternator that has the screw on feed and not the banjo new type. I will see if this works. Thanks.

[baba2000]

OK, I swapped the banjo type feed on the alternator to the normal screw on type and problem solved, no grating noise and as I hadn't drove on the second alternator far it looks like no damage done. The banjo type has to loop up and back down. I don't know if this causes a restriction, all I know is with the normal one looks like a smooth flow straight into the back of the alternator and it's now fine.

Thanks for the comment and help. Much appreciated.

[dumper]

The oil feed is for the vac pump not the alternator

[EsafaliTakru]

Hey there, that grinding noise and oil leak definitely sound concerning. Here are some thoughts on your situation:

Oil flow:

It is unusual for oil to be coming out of the thinner pipe and not the fatter one. Typically, the fatter pipe is the feed line, bringing oil from the engine to lubricate the vacuum pump.
The thinner pipe is usually the return line, sending used oil back to the engine crankcase.
Possible causes:

Faulty vacuum pump: The grinding noise and the reversed oil flow could indicate a damaged internal component in the vacuum pump, causing it to pump oil the wrong way.
Incorrect installation: It's possible the oil lines may have been accidentally swapped during installation.
Recommendations:

Do not run the engine until you address the issue. Running the engine with incorrect oil flow can further damage the vacuum pump and other engine components.
Consult a mechanic: It's important to have a qualified mechanic diagnose the source of the grinding noise and the reversed oil flow. They can properly assess the situation and recommend the necessary repairs or replacements.
Double-check installation: While less likely, it's worth verifying if the oil lines were installed correctly comparing to the vehicle's service manual or online resources.
Remember, ignoring the grinding noise and oil leak could lead to costly repairs down the road. It's best to have a professional diagnose the issue and get it fixed properly.

[baba2000]

https://www.transitcenter.ie/vacuum-pum ... -4176.html

As I said the alternator is now working fine. As above the thin pipe is the feed. I did take it to a mechanic and the noise was identified as coming from the vac pump on the alternator. The problem was the banjo fitting, once I fitted the above feed pipe as per factory , problem solved. Some new alternators have a banjo type fitting. This was replaced with a reducer and the above pipe. Thanks.

[Chug]

Wow are you an AI Transit expert, oh no you can't be you got the supply and return pipes wrong.

Hey there, that grinding noise and oil leak definitely sound concerning. Here are some thoughts on your situation:

Oil flow:

It is unusual for oil to be coming out of the thinner pipe and not the fatter one. Typically, the fatter pipe is the feed line, bringing oil from the engine to lubricate the vacuum pump.
The thinner pipe is usually the return line, sending used oil back to the engine crankcase.
Possible causes:

Faulty vacuum pump: The grinding noise and the reversed oil flow could indicate a damaged internal component in the vacuum pump, causing it to pump oil the wrong way.
Incorrect installation: It's possible the oil lines may have been accidentally swapped during installation.
Recommendations:

Do not run the engine until you address the issue. Running the engine with incorrect oil flow can further damage the vacuum pump and other engine components.
Consult a mechanic: It's important to have a qualified mechanic diagnose the source of the grinding noise and the reversed oil flow. They can properly assess the situation and recommend the necessary repairs or replacements.
Double-check installation: While less likely, it's worth verifying if the oil lines were installed correctly comparing to the vehicle's service manual or online resources.
Remember, ignoring the grinding noise and oil leak could lead to costly repairs down the road. It's best to have a professional diagnose the issue and get it fixed properly.

[dumper]

Yes would be a disaster if there was more oil going into the pump then can get out

[Altransit]

Wow are you an AI Transit expert, oh no you can't be you got the supply and return pipes wrong.

Hey there, that grinding noise and oil leak definitely sound concerning. Here are some thoughts on your situation:

These AI "experts are a bit of a nightmare at the moment. If you guys spot any who have snuck through post approval, I would appreciate it if you could report the post so that I can look more closely as to whether they should be here ........... or not